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45 lines
24 KiB
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<?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="H04S" definition-exists="true" date-revised="2018-08-01" status="published"><classification-symbol>H04S</classification-symbol><class-title date-revised="2018-05-01"><title-part><text>STEREOPHONIC SYSTEMS </text></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph>In this subclass, the following term is used with the meaning indicated:<subnote type="bullet"><note-paragraph>"stereophonic systems" covers quadraphonic or similar systems </note-paragraph></subnote></note-paragraph><note-paragraph> In this subclass, it is desirable to add the indexing codes of <class-ref scheme="cpc">H04S2400/00</class-ref> and <class-ref scheme="cpc">H04S2420/00</class-ref>.</note-paragraph></note><note type="warning"><note-paragraph>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.</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="H04S1/00" date-revised="2013-01-01" status="published"><classification-symbol>H04S1/00</classification-symbol>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H04S1/00" definition-exists="true" ipc-concordant="H04S1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S1/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two-channel systems </text><reference><text><class-ref scheme="cpc">H04S5/00</class-ref>, <class-ref scheme="cpc">H04S7/00</class-ref> take precedence</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="H04S1/002" definition-exists="true" ipc-concordant="H04S1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S1/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution </text><reference><text>control circuits for electronic adaptation of the sound field <class-ref scheme="cpc">H04S7/30</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="H04S1/005" definition-exists="false" ipc-concordant="H04S1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S1/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>For headphones</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="H04S1/007" definition-exists="true" ipc-concordant="H04S1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S1/007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in which the audio signals are in digital form </text><reference><text>data reduction aspects thereof based on psychoacoustics <class-ref scheme="cpc">G10L19/02</class-ref></text></reference></CPC-specific-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="H04S3/00" definition-exists="true" ipc-concordant="H04S3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S3/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Systems employing more than two channels, e.g. quadraphonic </text><reference><text><class-ref scheme="cpc">H04S5/00</class-ref>, <class-ref scheme="cpc">H04S7/00</class-ref> take precedence</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="H04S3/002" definition-exists="true" ipc-concordant="H04S3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S3/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution </text><reference><text>control circuits for electronic adaptation of the sound field <class-ref scheme="cpc">H04S7/30</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="H04S3/004" definition-exists="false" ipc-concordant="H04S3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S3/004</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>For headphones</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="H04S3/006" definition-exists="true" ipc-concordant="H04S3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04S3/006</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>in which a plurality of audio signals are transformed in a combination of audio signals and modulated signals, e.g. CD-4 systems</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="H04S3/008" definition-exists="true" ipc-concordant="H04S3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04S3/008</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>in which the audio signals are in digital form, i.e. employing more than two discrete digital channels </text><reference><text>data reduction aspects thereof based on psychoacoustics <class-ref scheme="cpc">G10L19/02</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="8" additional-only="false" sort-key="H04S3/02" definition-exists="true" ipc-concordant="H04S3/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S3/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other</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="H04S5/00" definition-exists="true" ipc-concordant="H04S5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-05-01" status="published"><classification-symbol>H04S5/00</classification-symbol><class-title date-revised="2018-05-01"><title-part><text>Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation </text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04S5/005" definition-exists="true" ipc-concordant="H04S5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S5/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of the pseudo five- or more-channel type, e.g. virtual surround</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="H04S5/02" definition-exists="false" ipc-concordant="H04S5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S5/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of the pseudo four-channel type, e.g. in which rear channel signals are derived from two-channel stereo signals</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="H04S7/00" definition-exists="true" ipc-concordant="H04S7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-10-01" status="published"><classification-symbol>H04S7/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indicating arrangements</text></title-part><title-part><text>Control arrangements, e.g. balance control</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04S7/30" definition-exists="true" ipc-concordant="H04S7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04S7/30</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>Control circuits for electronic adaptation of the sound field</text></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="H04S7/301" definition-exists="true" ipc-concordant="H04S7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S7/301</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Automatic calibration of stereophonic sound system, e.g. with test microphone</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="H04S7/302" definition-exists="true" ipc-concordant="H04S7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S7/302</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Electronic adaptation of stereophonic sound system to listener position or orientation </text><reference><text><class-ref scheme="cpc">H04S7/301</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="H04S7/303" definition-exists="true" ipc-concordant="H04S7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S7/303</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Tracking of listener position or orientation</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="H04S7/304" definition-exists="true" ipc-concordant="H04S7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S7/304</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>For headphones</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="9" additional-only="false" sort-key="H04S7/305" definition-exists="true" ipc-concordant="H04S7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04S7/305</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>Electronic adaptation of stereophonic audio signals to reverberation of the listening space </text><reference><text><class-ref scheme="cpc">H04S7/301</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="H04S7/306" definition-exists="false" ipc-concordant="H04S7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S7/306</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>For headphones</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="H04S7/307" definition-exists="true" ipc-concordant="H04S7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04S7/307</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>Frequency adjustment, e.g. tone control </text><reference><text><class-ref scheme="cpc">H04S7/301</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="H04S7/308" definition-exists="true" ipc-concordant="H04S7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S7/308</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Electronic adaptation dependent on speaker or headphone connection</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="H04S7/40" definition-exists="true" ipc-concordant="H04S7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04S7/40</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>Visual indication of stereophonic sound image</text></CPC-specific-text></title-part></class-title></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="H04S400/00" date-revised="2013-01-01" status="published"><classification-symbol>H04S2400/00</classification-symbol>
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<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="H04S400/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-05-01" status="published"><classification-symbol>H04S2400/00</classification-symbol><class-title date-revised="2019-05-01"><title-part><text>Details of stereophonic systems covered by <class-ref scheme="cpc">H04S</class-ref> but not provided for in its groups</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H04S400/01" definition-exists="true" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S2400/01</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved</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="H04S400/03" definition-exists="true" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S2400/03</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Aspects of down-mixing multi-channel audio to configurations with lower numbers of playback channels, e.g. 7.1 -> 5.1 </text><reference><text><class-ref scheme="cpc">H04S2400/01</class-ref> takes precedence</text></reference></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="H04S400/05" definition-exists="true" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S2400/05</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Generation or adaptation of centre channel in multi-channel audio systems</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="H04S400/07" definition-exists="true" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S2400/07</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Generation or adaptation of the Low Frequency Effect [LFE] channel, e.g. distribution or signal processing</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="H04S400/09" definition-exists="true" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S2400/09</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Electronic reduction of distortion of stereophonic sound systems</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="H04S400/11" definition-exists="true" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S2400/11</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Positioning of individual sound objects, e.g. moving airplane, within a sound field </text><reference><text><class-ref scheme="cpc">H04S2420/13</class-ref> takes precedence</text></reference></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="H04S400/13" definition-exists="true" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S2400/13</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Aspects of volume control, not necessarily automatic, in stereophonic sound systems</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="H04S400/15" definition-exists="true" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S2400/15</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Aspects of sound capture and related signal processing for recording or reproduction</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="H04S420/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-05-01" status="published"><classification-symbol>H04S2420/00</classification-symbol><class-title date-revised="2019-05-01"><title-part><text>Techniques used stereophonic systems covered by <class-ref scheme="cpc">H04S</class-ref> but not provided for in its groups</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H04S420/01" definition-exists="true" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S2420/01</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Enhancing the perception of the sound image or of the spatial distribution using head related transfer functions [HRTF's] or equivalents thereof, e.g. interaural time difference [ITD] or interaural level difference [ILD]</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="H04S420/03" definition-exists="true" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S2420/03</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Application of parametric coding in stereophonic audio systems</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="H04S420/05" definition-exists="true" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S2420/05</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Application of the precedence or Haas effect, i.e. the effect of first wavefront, in order to improve sound-source localisation</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="H04S420/07" definition-exists="true" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S2420/07</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Synergistic effects of band splitting and sub-band processing</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="H04S420/11" definition-exists="true" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S2420/11</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Application of ambisonics in stereophonic audio systems</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="H04S420/13" definition-exists="true" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04S2420/13</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Application of wave-field synthesis in stereophonic audio systems</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></class-scheme> |