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268 lines
140 KiB
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268 lines
140 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<class-scheme publication-date="2023-02-01" scheme-type="cpc" publication-type="official">
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<classification-item breakdown-code="false" not-allocatable="true" level="5" additional-only="false" sort-key="G10K" definition-exists="true" date-revised="2023-01-01" status="published"><classification-symbol>G10K</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>SOUND-PRODUCING DEVICES</text></title-part><title-part><text>METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL</text></title-part><title-part><text>ACOUSTICS NOT OTHERWISE PROVIDED FOR</text></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph>This subclass <u>covers</u> arrangements for generating mechanical vibrations in fluids.</note-paragraph><note-paragraph>This subclass <u>covers</u> also the production of sounds which may not be audible to human beings but which are audible to animals.</note-paragraph><note-paragraph> In this subclass, the following terms are used with the meanings indicated: <subnote type="bullet"><note-paragraph>"acoustics" and "sound" cover the technical field dealing with mechanical vibrations at all infrasonic -, sonic - and ultrasonic frequencies. However, generation or transmission of mechanical waves, in general, is covered by subclass <class-ref scheme="cpc">B06B</class-ref>, subject to the exception specified in Note (1) above.</note-paragraph></subnote></note-paragraph></note><note type="warning"><note-paragraph><CPC-specific-note>In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.</CPC-specific-note></note-paragraph></note></notes-and-warnings>
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<classification-item breakdown-code="false" not-allocatable="true" level="6" additional-only="false" sort-key="G10K1/00" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/00</classification-symbol>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="G10K1/00" definition-exists="true" ipc-concordant="G10K1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>G10K1/00</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs </text><reference><text>multi-toned musical instruments <class-ref scheme="cpc">G10D13/08</class-ref>; automatic carillons <class-ref scheme="cpc">G10F1/10</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K1/06" definition-exists="false" ipc-concordant="G10K1/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the resonating devices having the shape of a bell, plate, rod, or tube </text><reference><text>bells for towers <class-ref scheme="cpc">G10K1/28</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K1/062" definition-exists="true" ipc-concordant="G10K1/062" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>G10K1/062</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>electrically operated</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K1/063" definition-exists="false" ipc-concordant="G10K1/063" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/063</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the sounding member being a bell</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="G10K1/064" definition-exists="false" ipc-concordant="G10K1/064" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/064</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Operating or striking mechanisms therefor</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K1/0645" definition-exists="false" ipc-concordant="G10K1/064" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/0645</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>provided with loudness adjustment</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K1/065" definition-exists="true" ipc-concordant="G10K1/065" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>G10K1/065</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>for timed or repeated operation</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K1/066" definition-exists="false" ipc-concordant="G10K1/066" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/066</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the sounding member being a tube, plate or rod</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="G10K1/067" definition-exists="false" ipc-concordant="G10K1/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/067</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Operating or striking mechanisms therefor</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K1/068" definition-exists="false" ipc-concordant="G10K1/068" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/068</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>hydraulically operated</text></title-part><title-part><text>pneumatically operated</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K1/07" definition-exists="false" ipc-concordant="G10K1/07" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/07</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>mechanically operated</text></title-part><title-part><text>Hand bells</text></title-part><title-part><text>Bells for animals</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K1/071" definition-exists="false" ipc-concordant="G10K1/071" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/071</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hand bells</text></title-part><title-part><text>Bells for animals</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K1/072" definition-exists="false" ipc-concordant="G10K1/072" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/072</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Operating or striking mechanisms therefor</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="G10K1/074" definition-exists="false" ipc-concordant="G10K1/074" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/074</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with rotary clappers or shells</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="G10K1/076" definition-exists="true" ipc-concordant="G10K1/076" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>G10K1/076</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>for timed or repeated operation</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K1/08" definition-exists="false" ipc-concordant="G10K1/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Details or accessories of general applicability</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K1/10" definition-exists="false" ipc-concordant="G10K1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Sounding members</text></title-part><title-part><text>Mounting thereof</text></title-part><title-part><text>Clappers or other strikers</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K1/26" definition-exists="false" ipc-concordant="G10K1/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Mountings</text></title-part><title-part><text>Casings</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K1/28" definition-exists="false" ipc-concordant="G10K1/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/28</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Bells for towers or the like</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K1/30" definition-exists="false" ipc-concordant="G10K1/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Details or accessories</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K1/32" definition-exists="false" ipc-concordant="G10K1/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/32</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Sounding members</text></title-part><title-part><text>Clappers or other strikers</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K1/34" definition-exists="false" ipc-concordant="G10K1/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/34</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Operating mechanisms</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="G10K1/341" definition-exists="false" ipc-concordant="G10K1/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/341</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for a still-standing bell</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K1/342" definition-exists="false" ipc-concordant="G10K1/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/342</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>electrically operated</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="G10K1/344" definition-exists="false" ipc-concordant="G10K1/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/344</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for an oscillating bell which is driven once per cycle</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K1/345" definition-exists="false" ipc-concordant="G10K1/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/345</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>electrically operated</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="G10K1/347" definition-exists="false" ipc-concordant="G10K1/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/347</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for an oscillating bell which is driven twice per cycle</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K1/348" definition-exists="false" ipc-concordant="G10K1/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/348</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>electrically operated</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K1/36" definition-exists="true" ipc-concordant="G10K1/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>G10K1/36</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Means for silencing or damping</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K1/38" definition-exists="false" ipc-concordant="G10K1/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K1/38</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Supports</text></title-part><title-part><text>Mountings</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="G10K3/00" definition-exists="true" ipc-concordant="G10K3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>G10K3/00</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Rattles or like noise-producing devices </text><CPC-specific-text><text>, e.g. door-knockers</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="G10K5/00" definition-exists="true" ipc-concordant="G10K5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K5/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Whistles</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K5/02" definition-exists="false" ipc-concordant="G10K5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K5/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Ultrasonic whistles</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="G10K7/00" definition-exists="true" ipc-concordant="G10K7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K7/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Sirens</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K7/005" definition-exists="false" ipc-concordant="G10K7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K7/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Ultrasonic sirens</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K7/02" definition-exists="true" ipc-concordant="G10K7/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>G10K7/02</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>in which the sound-producing member is rotated manually or by a motor </text><reference><text><class-ref scheme="cpc">G10K7/06</class-ref> takes precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K7/04" definition-exists="false" ipc-concordant="G10K7/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K7/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by an electric motor</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K7/06" definition-exists="true" ipc-concordant="G10K7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>G10K7/06</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>in which the sound-producing member is driven by a fluid, e.g. by a compressed gas</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="G10K9/00" definition-exists="true" ipc-concordant="G10K9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>G10K9/00</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers </text><reference><text>loudspeakers or like acoustic electromechanical transducers <class-ref scheme="cpc">H04R</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K9/02" definition-exists="false" ipc-concordant="G10K9/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K9/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>driven by gas</text></title-part><title-part><text>e.g. suction operated</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K9/04" definition-exists="false" ipc-concordant="G10K9/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K9/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by compressed gases, e.g. compressed air</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K9/06" definition-exists="false" ipc-concordant="G10K9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K9/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>produced by detonation</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K9/08" definition-exists="false" ipc-concordant="G10K9/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K9/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>driven by water or other liquids</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K9/10" definition-exists="false" ipc-concordant="G10K9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K9/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>driven by mechanical means only</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K9/12" definition-exists="false" ipc-concordant="G10K9/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K9/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>electrically operated</text></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph> This group <u>does not cover</u> the construction of, or circuits for, broadband-transducers such as loudspeakers or microphones, which are covered by subclass <class-ref scheme="cpc">H04R</class-ref>. </note-paragraph></note></notes-and-warnings>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K9/121" definition-exists="false" ipc-concordant="G10K9/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K9/121</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Flextensional transducers</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K9/122" definition-exists="false" ipc-concordant="G10K9/122" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K9/122</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using piezo-electric driving means </text><CPC-specific-text><reference><text><class-ref scheme="cpc">G10K9/121</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K9/125" definition-exists="false" ipc-concordant="G10K9/125" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K9/125</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with a plurality of active elements</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K9/128" definition-exists="false" ipc-concordant="G10K9/128" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K9/128</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using magnetostrictive driving means </text><CPC-specific-text><reference><text><class-ref scheme="cpc">G10K9/121</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K9/13" definition-exists="false" ipc-concordant="G10K9/13" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K9/13</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using electromagnetic driving means</text></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph> <u>see</u> provisionally also <class-ref scheme="cpc">G10K9/12</class-ref></note-paragraph></note></notes-and-warnings>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K9/15" definition-exists="false" ipc-concordant="G10K9/15" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K9/15</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Self-interrupting arrangements</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K9/16" definition-exists="false" ipc-concordant="G10K9/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K9/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with means for generating current by muscle power</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K9/18" definition-exists="true" ipc-concordant="G10K9/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>G10K9/18</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Details, e.g. bulbs, pumps, pistons, switches or casings</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K9/20" definition-exists="false" ipc-concordant="G10K9/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K9/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Sounding members</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K9/22" definition-exists="false" ipc-concordant="G10K9/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K9/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Mountings</text></title-part><title-part><text>Casings</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="G10K11/00" definition-exists="true" ipc-concordant="G10K11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/00</classification-symbol><class-title date-revised="2018-01-01"><title-part><text>Methods or devices for transmitting, conducting or directing sound in general</text></title-part><title-part><text>Methods or devices for protecting against, or for damping, noise or other acoustic waves in general</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K11/002" definition-exists="true" ipc-concordant="G10K11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>G10K11/002</classification-symbol><class-title date-revised="2016-05-01"><title-part><CPC-specific-text><text>Devices for damping, suppressing, obstructing or conducting sound in acoustic devices </text><reference><text><class-ref scheme="cpc">G10K1/06</class-ref> - <class-ref scheme="cpc">G10K1/10</class-ref> take precedence; for electro-mechanical transducers for communication <class-ref scheme="cpc">H04R3/002</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K11/004" definition-exists="false" ipc-concordant="G10K11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>G10K11/004</classification-symbol><class-title date-revised="2016-08-01"><title-part><CPC-specific-text><text>Mounting transducers, e.g. provided with mechanical moving or orienting device </text><reference><text>mountings specially adapted to a particular sound-producing device, <u>see</u> the preceding groups <class-ref scheme="cpc">G10K1/00</class-ref> - <class-ref scheme="cpc">G10K9/00</class-ref>, e.g. <class-ref scheme="cpc">G10K1/26</class-ref>, <class-ref scheme="cpc">G10K1/28</class-ref>, <class-ref scheme="cpc">G10K9/22</class-ref>; arrangements of sonic watch equipment on submarines <class-ref scheme="cpc">B63G8/39</class-ref>; buoys <class-ref scheme="cpc">B63B22/00</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K11/006" definition-exists="false" ipc-concordant="G10K11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Transducer mounting in underwater equipment, e.g. sonobuoys</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K11/008" definition-exists="false" ipc-concordant="G10K11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/008</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrays of transducers </text><reference><text>seismic streamers, <u>see</u> <class-ref scheme="cpc">G01V1/20</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K11/02" definition-exists="false" ipc-concordant="G10K11/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Mechanical acoustic impedances</text></title-part><title-part><text>Impedance matching, e.g. by horns</text></title-part><title-part><text>Acoustic resonators</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K11/025" definition-exists="false" ipc-concordant="G10K11/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>horns for impedance matching </text><reference><text><u>see</u> provisionally also <class-ref scheme="cpc">G10K11/28</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K11/04" definition-exists="false" ipc-concordant="G10K11/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Acoustic filters </text><CPC-specific-text><text>; Acoustic resonators</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K11/08" definition-exists="false" ipc-concordant="G10K11/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Non-electric sound-amplifying devices, e.g. non-electric megaphones </text><reference><text>amplifying by horns <class-ref scheme="cpc">G10K11/02</class-ref>; amplifying by focusing <class-ref scheme="cpc">G10K11/26</class-ref></text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K11/16" definition-exists="true" ipc-concordant="G10K11/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/16</classification-symbol><class-title date-revised="2018-01-01"><title-part><text>Methods or devices for protecting against, or for damping, noise or other acoustic waves in general </text><reference><text><class-ref scheme="cpc">G10K11/36</class-ref> takes precedence</text></reference></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph>This group <u>does not cover</u> protecting against, or damping of, acoustic waves adapted for particular applications, which are covered by the subclasses for these applications, provided that there is a specific provision for this aspect.</note-paragraph></note></notes-and-warnings>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K11/161" definition-exists="false" ipc-concordant="G10K11/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/161</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in systems with fluid flow </text><reference><text><class-ref scheme="cpc">G10K11/162</class-ref> takes precedence; gas flow silencers or exhaust apparatus for machines or engines in general or for internal combustion engine <class-ref scheme="cpc">F01N</class-ref>, noise absorbers in pipes or pipe systems <class-ref scheme="cpc">F16L55/02</class-ref>; noise absorption in air conditioning and ventilation <class-ref scheme="cpc">F24F13/24</class-ref>; silencing exhaust or propulsion jets in aircraft <class-ref scheme="cpc">B64D33/06</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K11/162" definition-exists="false" ipc-concordant="G10K11/162" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/162</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Selection of materials</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K11/165" definition-exists="true" ipc-concordant="G10K11/165" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/165</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Particles in a matrix</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K11/168" definition-exists="false" ipc-concordant="G10K11/168" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/168</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Plural layers of different materials, e.g. sandwiches</text></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph> When classifying in this group, classification is also made in subclass <class-ref scheme="cpc">B32B</class-ref>, in so far as any layered product is concerned. </note-paragraph></note></notes-and-warnings></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K11/172" definition-exists="false" ipc-concordant="G10K11/172" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-05-01" status="published"><classification-symbol>G10K11/172</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using resonance effects</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K11/175" definition-exists="false" ipc-concordant="G10K11/175" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-02-01" status="published"><classification-symbol>G10K11/175</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using interference effects</text></title-part><title-part><text>Masking sound</text></title-part></class-title><notes-and-warnings><note type="note"><note-paragraph>Sound/noise masking, classified in <class-ref scheme="cpc">G10K11/1752</class-ref> - <class-ref scheme="cpc">G10K11/1754</class-ref>,</note-paragraph><note-paragraph>Acoustic noise cancellation, classified in <class-ref scheme="cpc">G10K11/178</class-ref></note-paragraph></note></notes-and-warnings>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K11/1752" definition-exists="false" ipc-concordant="G10K11/175" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-02-01" status="published"><classification-symbol>G10K11/1752</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>Masking</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="G10K11/1754" definition-exists="false" ipc-concordant="G10K11/175" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-02-01" status="published"><classification-symbol>G10K11/1754</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>Speech masking</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K11/178" definition-exists="true" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-08-01" status="published"><classification-symbol>G10K11/178</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by electro-acoustically regenerating the original acoustic waves in anti-phase</text></title-part></class-title><notes-and-warnings><note type="note"><note-paragraph><CPC-specific-note>When classifying in any of the groups <class-ref scheme="cpc">G10K11/1781</class-ref> - <class-ref scheme="cpc">G10K11/17861</class-ref>, classification is also made in at least one subgroup of <class-ref scheme="cpc">G10K11/1787</class-ref>.</CPC-specific-note></note-paragraph></note></notes-and-warnings>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="G10K11/1781" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-08-01" status="published"><classification-symbol>G10K11/1781</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K11/17813" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17813</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="G10K11/17815" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17815</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>between the reference signals and the error signals, i.e. primary path</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="G10K11/17817" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17817</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>between the output signals and the error signals, i.e. secondary path</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="G10K11/17819" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17819</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>between the output signals and the reference signals, e.g. to prevent howling</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K11/17821" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17821</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>characterised by the analysis of the input signals only</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="G10K11/17823" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17823</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>Reference signals, e.g. ambient acoustic environment</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="G10K11/17825" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17825</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>Error signals</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="G10K11/17827" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17827</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>Desired external signals, e.g. pass-through audio such as music or speech</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="G10K11/1783" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-08-01" status="published"><classification-symbol>G10K11/1783</classification-symbol><class-title date-revised="2020-08-01"><title-part><CPC-specific-text><text>handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K11/17833" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17833</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>by using a self-diagnostic function or a malfunction prevention function, e.g. detecting abnormal output levels</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="G10K11/17835" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17835</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>using detection of abnormal input signals</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K11/17837" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17837</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>by retaining part of the ambient acoustic environment, e.g. speech or alarm signals that the user needs to hear</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="G10K11/1785" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-08-01" status="published"><classification-symbol>G10K11/1785</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>Methods, e.g. algorithms; Devices </text><reference><text><class-ref scheme="cpc">G10K11/1781</class-ref>, <class-ref scheme="cpc">G10K11/1783</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K11/17853" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>G10K11/17853</classification-symbol><class-title date-revised="2020-08-01"><title-part><CPC-specific-text><text>of the filter</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="G10K11/17854" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17854</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>the filter being an adaptive filter</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K11/17855" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17855</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>for improving speed or power requirements</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K11/17857" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17857</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>Geometric disposition, e.g. placement of microphones</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K11/17861" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17861</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>using additional means for damping sound, e.g. using sound absorbing panels</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="G10K11/1787" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-08-01" status="published"><classification-symbol>G10K11/1787</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>General system configurations</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K11/17873" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17873</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>using a reference signal without an error signal, e.g. pure feedforward</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K11/17875" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17875</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>using an error signal without a reference signal, e.g. pure feedback</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K11/17879" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17879</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>using both a reference signal and an error signal</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="G10K11/17881" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17881</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>the reference signal being an acoustic signal, e.g. recorded with a microphone</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="G10K11/17883" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17883</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>the reference signal being derived from a machine operating condition, e.g. engine RPM or vehicle speed</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K11/17885" definition-exists="false" ipc-concordant="G10K11/178" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K11/17885</classification-symbol><class-title date-revised="2018-01-01"><title-part><CPC-specific-text><text>additionally using a desired external signal, e.g. pass-through audio such as music or speech</text></CPC-specific-text></title-part></class-title><notes-and-warnings><note type="note"><note-paragraph><CPC-specific-note>When classifying in this group, classification is also made in the other appropriate groups under <class-ref scheme="cpc">G10K11/1787</class-ref>.</CPC-specific-note></note-paragraph></note></notes-and-warnings></classification-item></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K11/18" definition-exists="true" ipc-concordant="G10K11/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>G10K11/18</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Methods or devices for transmitting, conducting or directing sound </text><reference><text><class-ref scheme="cpc">G10K11/02</class-ref>, <class-ref scheme="cpc">G10K11/36</class-ref> take precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K11/20" definition-exists="true" ipc-concordant="G10K11/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reflecting arrangements </text><reference><text><class-ref scheme="cpc">G10K11/28</class-ref> takes precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K11/205" definition-exists="false" ipc-concordant="G10K11/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/205</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for underwater use</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K11/22" definition-exists="false" ipc-concordant="G10K11/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for conducting sound through hollow pipes, e.g. speaking tubes</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K11/24" definition-exists="true" ipc-concordant="G10K11/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>G10K11/24</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>for conducting sound through solid bodies, e.g. wires</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K11/26" definition-exists="true" ipc-concordant="G10K11/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>G10K11/26</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Sound-focusing or directing, e.g. scanning</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K11/28" definition-exists="true" ipc-concordant="G10K11/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>G10K11/28</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>using reflection, e.g. parabolic reflectors</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K11/30" definition-exists="false" ipc-concordant="G10K11/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using refraction, e.g. acoustic lenses</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K11/32" definition-exists="false" ipc-concordant="G10K11/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/32</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>characterised by the shape of the source</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K11/34" definition-exists="false" ipc-concordant="G10K11/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/34</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using electrical steering of transducer arrays, e.g. beam steering </text><CPC-specific-text><reference><text>constructional aspects <class-ref scheme="cpc">B06B1/0607</class-ref>, <class-ref scheme="cpc">B06B1/085</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="G10K11/341" definition-exists="false" ipc-concordant="G10K11/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/341</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Circuits therefor</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K11/343" definition-exists="false" ipc-concordant="G10K11/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/343</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using frequency variation or different frequencies</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K11/345" definition-exists="false" ipc-concordant="G10K11/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/345</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using energy switching from one active element to another</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K11/346" definition-exists="false" ipc-concordant="G10K11/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/346</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using phase variation</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K11/348" definition-exists="false" ipc-concordant="G10K11/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/348</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using amplitude variation</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="G10K11/35" definition-exists="false" ipc-concordant="G10K11/35" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/35</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using mechanical steering of transducers </text><CPC-specific-text><text>or their beams</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="G10K11/352" definition-exists="false" ipc-concordant="G10K11/35" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/352</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by moving the transducer</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="G10K11/355" definition-exists="false" ipc-concordant="G10K11/35" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/355</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arcuate movement</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="G10K11/357" definition-exists="false" ipc-concordant="G10K11/35" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/357</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by moving a reflector</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K11/36" definition-exists="true" ipc-concordant="G10K11/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K11/36</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Devices for manipulating acoustic surface waves </text><reference><text>electro-acoustic amplifiers <class-ref scheme="cpc">H03F13/00</class-ref>; networks comprising electro-acoustic elements <class-ref scheme="cpc">H03H9/00</class-ref></text></reference></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="G10K13/00" definition-exists="true" ipc-concordant="G10K13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K13/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Cones, diaphragms, or the like, for emitting or receiving sound in general </text><reference><text>for electromechanical transducers <class-ref scheme="cpc">H04R7/00</class-ref></text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="G10K15/00" definition-exists="true" ipc-concordant="G10K15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K15/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Acoustics not otherwise provided for</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K15/02" definition-exists="true" ipc-concordant="G10K15/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>G10K15/02</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Synthesis of acoustic waves </text><reference><text>synthesis of speech <class-ref scheme="cpc">G10L13/00</class-ref></text></reference></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph> <u>see</u> provisionally <class-ref scheme="cpc">G10H</class-ref> e.g. <class-ref scheme="cpc">G10H1/26</class-ref></note-paragraph></note></notes-and-warnings></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K15/04" definition-exists="true" ipc-concordant="G10K15/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K15/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Sound-producing devices </text><reference><text><class-ref scheme="cpc">G10K15/02</class-ref> takes precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K15/043" definition-exists="true" ipc-concordant="G10K15/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K15/043</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>producing shock waves </text><reference><text><class-ref scheme="cpc">G10K15/046</class-ref>, <class-ref scheme="cpc">G10K15/06</class-ref> take precedence; generating seismic energy <class-ref scheme="cpc">G01V1/02</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K15/046" definition-exists="false" ipc-concordant="G10K15/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K15/046</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using optical excitation, e.g. laser bundle</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K15/06" definition-exists="false" ipc-concordant="G10K15/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K15/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using electric discharge</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="G10K15/08" definition-exists="false" ipc-concordant="G10K15/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K15/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrangements for producing a reverberation or echo sound </text><CPC-specific-text><reference><text>modifying acoustic properties to change reverberation time <class-ref scheme="cpc">G10K11/002</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K15/10" definition-exists="false" ipc-concordant="G10K15/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K15/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using time-delay networks comprising electromechanical or electro-acoustic devices</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="G10K15/12" definition-exists="false" ipc-concordant="G10K15/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K15/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using electronic time-delay networks</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="true" level="6" additional-only="true" sort-key="G10K200/00" date-revised="2013-01-01" status="published"><classification-symbol>G10K2200/00</classification-symbol>
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<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="G10K200/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>G10K2200/00</classification-symbol><class-title date-revised="2018-01-01"><title-part><text>Details of methods or devices for transmitting, conducting or directing sound in general</text></title-part></class-title>
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|
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="G10K200/10" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2200/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Beamforming, e.g. time reversal, phase conjugation or similar</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="G10K200/11" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2200/11</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Underwater, e.g. transducers for generating acoustic waves underwater</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="G10K210/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Details of active noise control [ANC] covered by <class-ref scheme="cpc">G10K11/178</class-ref> but not provided for in any of its subgroups</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="G10K210/10" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Applications</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/101" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/101</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One dimensional</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/102" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/102</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two dimensional</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/103" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/103</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Three dimensional</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/104" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/104</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Aircos</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/105" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/105</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Appliances, e.g. washing machines or dishwashers</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/1051" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/1051</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Camcorder</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/1052" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/1052</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Copiers or other image-forming apparatus, e.g. laser printer</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/1053" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/1053</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hi-fi, i.e. anything involving music, radios or loudspeakers</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/1054" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/1054</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Refrigerators</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/106" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/106</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Boxes, i.e. active box covering a noise source</text></title-part><title-part><text>Enclosures</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/107" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/107</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Combustion, e.g. burner noise control of jet engines </text><reference><text>internal combustion engines <class-ref scheme="cpc">G10K2210/121</class-ref></text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/108" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/108</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Communication systems, e.g. where useful sound is kept and noise is cancelled</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/1081" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/1081</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Earphones, e.g. for telephones, ear protectors or headsets</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/1082" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/1082</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Microphones, e.g. systems using "virtual" microphones</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/109" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/109</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Compressors, e.g. fans</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/11" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/11</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Computers, i.e. ANC of the noise created by cooling fan, hard drive or the like</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/111" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/111</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Directivity control or beam pattern</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/112" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/112</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Ducts </text><reference><text>vehicle exhausts <class-ref scheme="cpc">G10K2210/12822</class-ref></text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/113" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/113</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Elevators</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/114" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/114</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Feeders, i.e. of the vibrating kind</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/115" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/115</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Impact noise, e.g. from typewriter or printer</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/116" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/116</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Medical</text></title-part><title-part><text>Dental</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/1161" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/1161</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>NMR or MRI</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/117" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/117</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Nonlinear</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/118" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/118</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Panels, e.g. active sound-absorption panels or noise barriers</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/119" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/119</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Radiation control, e.g. control of sound radiated by vibrating structures</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/12" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Rooms, e.g. ANC inside a room, office, concert hall or automobile cabin</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/121" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/121</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Rotating machines, e.g. engines, turbines, motors</text></title-part><title-part><text>Periodic or quasi-periodic signals in general</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/122" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/122</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Seismics</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/123" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/123</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Synchrophasors or other applications where multiple noise sources are driven with a particular phase relationship</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/124" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/124</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Traffic</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/125" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/125</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Transformers</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/126" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/126</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Transients</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/127" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/127</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Underwater acoustics, e.g. for submarine</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/128" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/128</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Vehicles</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/1281" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/1281</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Aircraft, e.g. spacecraft, airplane or helicopter</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/1282" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/1282</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Automobiles</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="G10K210/12821" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/12821</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Rolling noise</text></title-part><title-part><text>Wind and body noise</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="G10K210/12822" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/12822</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Exhaust pipes or mufflers</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/1283" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/1283</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Trains, trams or the like</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/129" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/129</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Vibration, e.g. instead of, or in addition to, acoustic noise</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/1291" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/1291</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Anti-Vibration-Control, e.g. reducing vibrations in panels or beams</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="G10K210/30" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Means</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/301" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/301</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Computational</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3011" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3011</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Single acoustic input</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3012" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3012</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Algorithms</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3013" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3013</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Analogue, i.e. using analogue computers or circuits</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3014" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3014</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Adaptive noise equalizers [ANE], i.e. where part of the unwanted sound is retained</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3015" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3015</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Averaging, e.g. exponential</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3016" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3016</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Control strategies, e.g. energy minimization or intensity measurements</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3017" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3017</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Copy, i.e. whereby an estimated transfer function in one functional block is copied to another block</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3018" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3018</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Correlators, e.g. convolvers or coherence calculators</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3019" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3019</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Cross-terms between multiple in's and out's</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3021" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3021</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Eigenfrequencies</text></title-part><title-part><text>Eigenvalues, e.g. used to identify most significant couplings between actuators and sensors</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3022" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3022</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Error paths</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3023" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3023</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Estimation of noise, e.g. on error signals</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="G10K210/30231" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/30231</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Sources, e.g. identifying noisy processes or components</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="G10K210/30232" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/30232</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Transfer functions, e.g. impulse response</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3024" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3024</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Expert systems, e.g. artificial intelligence</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3025" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3025</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Determination of spectrum characteristics, e.g. FFT</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3026" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3026</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Feedback</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3027" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3027</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Feedforward</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3028" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3028</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Filtering, e.g. Kalman filters or special analogue or digital filters</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="G10K210/30281" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/30281</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Lattice filters</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3029" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3029</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Fuzzy logic</text></title-part><title-part><text>Genetic algorithms</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3031" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3031</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hardware, e.g. architecture</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3032" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3032</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Harmonics or sub-harmonics</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3033" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3033</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Information contained in memory, e.g. stored signals or transfer functions</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3034" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3034</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Integrators</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3035" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3035</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Models, e.g. of the acoustic system</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="G10K210/30351" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/30351</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Identification of the environment for applying appropriate model characteristics</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3036" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3036</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modes, e.g. vibrational or spatial modes</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3037" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3037</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Monitoring various blocks in the flow chart</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3038" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3038</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Neural networks</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3039" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3039</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Nonlinear, e.g. clipping, numerical truncation, thresholding or variable input and output gain</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="G10K210/30391" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/30391</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Resetting of the filter parameters or changing the algorithm according to prevailing conditions</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3041" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3041</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Offline</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3042" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3042</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Parallel processing</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3043" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3043</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Phase locked loops [PLL]</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3044" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3044</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Phase shift, e.g. complex envelope processing</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3045" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3045</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Multiple acoustic inputs, single acoustic output</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3046" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3046</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Multiple acoustic inputs, multiple acoustic outputs</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3047" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3047</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Prediction, e.g. of future values of noise</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3048" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3048</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Pretraining, e.g. to identify transfer functions</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3049" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>G10K2210/3049</classification-symbol><class-title date-revised="2016-08-01"><title-part><text>Random noise used, e.g. in model identification</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3051" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3051</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Sampling, e.g. variable rate, synchronous, decimated or interpolated</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3052" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3052</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Simulation</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3053" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3053</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Speeding up computation or convergence, or decreasing the computational load</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3054" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3054</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Stepsize variation</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3055" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3055</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Transfer function of the acoustic system</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3056" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3056</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Variable gain</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3057" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3057</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Variation of parameters to test for optimisation</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/321" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/321</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Physical</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3211" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3211</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Active mounts for vibrating structures with means to actively suppress the vibration, e.g. for vehicles</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3212" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3212</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Actuator details, e.g. composition or microstructure</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="G10K210/32121" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/32121</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Fluid amplifiers, e.g. modulated gas flow speaker using electrovalves</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3213" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3213</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Automatic gain control [AGC]</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3214" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3214</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Architectures, e.g. special constructional features or arrangements of features</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3215" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3215</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrays, e.g. for beamforming</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3216" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3216</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Cancellation means disposed in the vicinity of the source</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3217" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3217</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Collocated sensor and cancelling actuator, e.g. "virtual earth" designs</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3218" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3218</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Filters other than the algorithm-related filters</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3219" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3219</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Geometry of the configuration</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3221" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3221</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Headrests, seats or the like, for personal ANC systems</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3222" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3222</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Manual tuning</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3223" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3223</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Materials, e.g. special compositions or gases</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3224" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3224</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Passive absorbers</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3225" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3225</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Radio or other sources used in ANC for transfer function estimation</text></title-part><title-part><text>Means to avoid interference between desired signals, e.g. from a car stereo, and the ANC signal</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3226" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3226</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Sensor details, e.g. for producing a reference or error signal</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3227" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3227</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Resonators</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="G10K210/32271" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/32271</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Active resonators</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="G10K210/32272" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/32272</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Helmholtz resonators</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3228" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3228</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Shunts</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="G10K210/3229" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/3229</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Transducers</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="G10K210/32291" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-01-01" status="published"><classification-symbol>G10K2210/32291</classification-symbol><class-title date-revised="2017-01-01"><title-part><text>Plates or thin films, e.g. PVDF </text><reference><text>foil-type piezo-electric elements <class-ref scheme="cpc">B06B1/0688</class-ref></text></reference></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="G10K210/50" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/50</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Miscellaneous</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/501" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/501</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Acceleration, e.g. for accelerometers</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/502" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/502</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Ageing, e.g. of the control system</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/503" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/503</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Diagnostics</text></title-part><title-part><text>Stability</text></title-part><title-part><text>Alarms</text></title-part><title-part><text>Failsafe</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/504" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/504</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Calibration</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/505" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/505</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Echo cancellation, e.g. multipath-, ghost- or reverberation-cancellation</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/506" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/506</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Feedback, e.g. howling</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/507" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/507</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Flow or turbulence</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/508" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/508</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reviews on ANC in general, e.g. literature</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/509" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/509</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hybrid, i.e. combining different technologies, e.g. passive and active</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/51" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/51</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Improving tonal quality, e.g. mimicking sports cars</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/511" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/511</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Narrow band, e.g. implementations for single frequency cancellation</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="G10K210/512" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>G10K2210/512</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Wide band, e.g. non-recurring signals</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></classification-item></class-scheme> |