ZSI_Reconnect_China/PATSTAT/CPC_data/CPCSchemeXML202302/cpc-scheme-H03G.xml

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<class-scheme publication-date="2023-02-01" scheme-type="cpc" publication-type="official">
<classification-item breakdown-code="false" not-allocatable="true" level="5" additional-only="false" sort-key="H03G" definition-exists="true" date-revised="2018-08-01" status="published"><classification-symbol>H03G</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>CONTROL OF AMPLIFICATION </text><reference><text>impedance networks, e.g. attenuators, <class-ref scheme="cpc">H03H</class-ref>; control of transmission in lines <class-ref scheme="cpc">H04B3/04</class-ref></text></reference></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph> This subclass <u>covers</u>: <subnote type="bullet"><note-paragraph>control of gain of amplifiers or frequency-changers, </note-paragraph><note-paragraph>control of frequency range of amplifiers, </note-paragraph><note-paragraph>limiting amplitude or rate of change of amplitude </note-paragraph></subnote></note-paragraph><note-paragraph>Attention is drawn to the Note following the title of subclass <class-ref scheme="cpc">H03F</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>
<classification-item breakdown-code="false" not-allocatable="true" level="6" additional-only="false" sort-key="H03G1/00" date-revised="2013-01-01" status="published"><classification-symbol>H03G1/00</classification-symbol>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03G1/00" definition-exists="true" ipc-concordant="H03G1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G1/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Details of arrangements for controlling amplification </text><CPC-specific-text><reference><text>for arrangements combined with means for generating a controlling signal, or these means <u>per se</u>, <u>see</u> the other main groups of <class-ref scheme="cpc">H03G</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G1/0005" definition-exists="false" ipc-concordant="H03G1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G1/0005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G1/0011" definition-exists="false" ipc-concordant="H03G1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G1/0011</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the device being at least one of the amplifying tubes of the amplifier</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G1/0017" definition-exists="false" ipc-concordant="H03G1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G1/0017</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the device being at least one of the amplifying solid state elements of the amplifier</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G1/0023" definition-exists="true" ipc-concordant="H03G1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-07-01" status="published"><classification-symbol>H03G1/0023</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in emitter-coupled or cascode amplifiers </text><reference><text><class-ref scheme="cpc">H03G1/0029</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G1/0029" definition-exists="true" ipc-concordant="H03G1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G1/0029</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using FETs</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G1/0035" definition-exists="true" ipc-concordant="H03G1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G1/0035</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using continuously variable impedance elements</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G1/0041" definition-exists="false" ipc-concordant="H03G1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G1/0041</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using thermistors</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G1/0047" definition-exists="false" ipc-concordant="H03G1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G1/0047</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using photo-electric elements</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G1/0052" definition-exists="false" ipc-concordant="H03G1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G1/0052</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using diodes</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G1/0058" definition-exists="false" ipc-concordant="H03G1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G1/0058</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>PIN-diodes</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G1/0064" definition-exists="false" ipc-concordant="H03G1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G1/0064</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Variable capacitance diodes</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G1/007" definition-exists="false" ipc-concordant="H03G1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G1/007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using FET type devices</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G1/0076" definition-exists="false" ipc-concordant="H03G1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G1/0076</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using galvanomagnetic elements</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G1/0082" definition-exists="false" ipc-concordant="H03G1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G1/0082</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using bipolar transistor-type devices</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G1/0088" definition-exists="true" ipc-concordant="H03G1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G1/0088</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using discontinuously variable devices, e.g. switch-operated</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G1/0094" definition-exists="false" ipc-concordant="H03G1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G1/0094</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using switched capacitors</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G1/02" definition-exists="false" ipc-concordant="H03G1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G1/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Remote control of amplification, tone, or bandwidth </text><reference><text>remote control in general <class-ref scheme="cpc">G05</class-ref>, <class-ref scheme="cpc">G08</class-ref>; combined with remote tuning or selection of resonant circuits <class-ref scheme="cpc">H03J</class-ref></text></reference></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G1/04" definition-exists="false" ipc-concordant="H03G1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G1/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modifications of control circuit to reduce distortion caused by control </text><reference><text>modifications to reduce influence of variations of internal impedance of amplifying elements caused by control <class-ref scheme="cpc">H03F1/08</class-ref></text></reference></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03G3/00" definition-exists="true" ipc-concordant="H03G3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Gain control in amplifiers or frequency changers </text><CPC-specific-text><text>without distortion of the input signal</text></CPC-specific-text><reference><text>gated amplifiers <class-ref scheme="cpc">H03F3/72</class-ref>; peculiar to television receivers <class-ref scheme="cpc">H04N</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G3/001" definition-exists="true" ipc-concordant="H03G3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/001</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Digital control of analog signals</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G3/002" definition-exists="true" ipc-concordant="H03G3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Control of digital or coded signals </text><reference><text><class-ref scheme="cpc">H03G3/3089</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G3/004" definition-exists="false" ipc-concordant="H03G3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/004</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Control by varying the supply voltage</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G3/005" definition-exists="false" ipc-concordant="H03G3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Control by a pilot signal </text><reference><text><class-ref scheme="cpc">H03G3/001</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G3/007" definition-exists="false" ipc-concordant="H03G3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Control dependent on the supply voltage</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G3/008" definition-exists="false" ipc-concordant="H03G3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/008</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Control by switched capacitors</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G3/02" definition-exists="true" ipc-concordant="H03G3/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Manually-operated control </text><CPC-specific-text><reference><text><class-ref scheme="cpc">H03G3/001</class-ref> and <class-ref scheme="cpc">H03G3/002</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G3/04" definition-exists="false" ipc-concordant="H03G3/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in untuned amplifiers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G3/06" definition-exists="false" ipc-concordant="H03G3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having discharge tubes</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G3/08" definition-exists="false" ipc-concordant="H03G3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>incorporating negative feedback</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G3/10" definition-exists="false" ipc-concordant="H03G3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having semiconductor devices</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G3/12" definition-exists="false" ipc-concordant="H03G3/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>incorporating negative feedback</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G3/14" definition-exists="false" ipc-concordant="H03G3/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in frequency-selective amplifiers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G3/16" definition-exists="false" ipc-concordant="H03G3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having discharge tubes</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G3/18" definition-exists="false" ipc-concordant="H03G3/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having semiconductor devices</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G3/20" definition-exists="true" ipc-concordant="H03G3/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Automatic control </text><reference><CPC-specific-text><text><class-ref scheme="cpc">H03G3/005</class-ref> takes precedence </text></CPC-specific-text><text> ; combined with volume compression or expansion <class-ref scheme="cpc">H03G7/00</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G3/22" definition-exists="false" ipc-concordant="H03G3/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in amplifiers having discharge tubes</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G3/225" definition-exists="false" ipc-concordant="H03G3/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/225</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>controlling or controlled by the (local) oscillators of a (super)heterodyne receiver</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G3/24" definition-exists="false" ipc-concordant="H03G3/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Control dependent upon ambient noise level or sound level</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G3/26" definition-exists="false" ipc-concordant="H03G3/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Muting amplifier when no signal is present </text><CPC-specific-text><text>or when only weak signals are present, or caused by the presence of noise, e.g. squelch systems</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G3/28" definition-exists="false" ipc-concordant="H03G3/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H03G3/28</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>in frequency-modulation receivers </text><CPC-specific-text><text>; in angle-modulation receivers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G3/30" definition-exists="true" ipc-concordant="H03G3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in amplifiers having semiconductor devices</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G3/3005" definition-exists="true" ipc-concordant="H03G3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/3005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in amplifiers suitable for low-frequencies, e.g. audio amplifiers </text><reference><text><class-ref scheme="cpc">H03G3/32</class-ref>, <class-ref scheme="cpc">H03G3/34</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G3/301" definition-exists="false" ipc-concordant="H03G3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/301</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the gain being continuously variable</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03G3/3015" definition-exists="false" ipc-concordant="H03G3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/3015</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using diodes or transistors</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03G3/3021" definition-exists="false" ipc-concordant="H03G3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/3021</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by varying the duty cycle</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G3/3026" definition-exists="false" ipc-concordant="H03G3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/3026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the gain being discontinuously variable, e.g. controlled by switching</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03G3/3031" definition-exists="false" ipc-concordant="H03G3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/3031</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using switched capacitors</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G3/3036" definition-exists="true" ipc-concordant="H03G3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/3036</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in high-frequency amplifiers or in frequency-changers </text><reference><text><class-ref scheme="cpc">H03G3/3052</class-ref>, <class-ref scheme="cpc">H03G3/32</class-ref>, <class-ref scheme="cpc">H03G3/34</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G3/3042" definition-exists="true" ipc-concordant="H03G3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/3042</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in modulators, frequency-changers, transmitters or power amplifiers </text><reference><text>transmission power control in bidirectional transmission systems <class-ref scheme="cpc">H04W52/04</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03G3/3047" definition-exists="true" ipc-concordant="H03G3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/3047</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for intermittent signals, e.g. burst signals</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G3/3052" definition-exists="true" ipc-concordant="H03G3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/3052</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver </text><reference><text><class-ref scheme="cpc">H03G3/32</class-ref>, <class-ref scheme="cpc">H03G3/34</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G3/3057" definition-exists="true" ipc-concordant="H03G3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/3057</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using at least one diode as controlling device</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G3/3063" definition-exists="true" ipc-concordant="H03G3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/3063</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using at least one transistor as controlling device, the transistor being used as a variable impedance device</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G3/3068" definition-exists="true" ipc-concordant="H03G3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/3068</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Circuits generating control signals for both R.F. and I.F. stages</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G3/3073" definition-exists="true" ipc-concordant="H03G3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/3073</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Circuits generating control signals when no carrier is present, or in SSB, CW or pulse receivers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G3/3078" definition-exists="true" ipc-concordant="H03G3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/3078</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Circuits generating control signals for digitally modulated signals</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G3/3084" definition-exists="false" ipc-concordant="H03G3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/3084</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in receivers or transmitters for electromagnetic waves other than radiowaves, e.g. lightwaves </text><reference><text><class-ref scheme="cpc">H03G3/32</class-ref>, <class-ref scheme="cpc">H03G3/34</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G3/3089" definition-exists="true" ipc-concordant="H03G3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/3089</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Control of digital or coded signals</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G3/3094" definition-exists="false" ipc-concordant="H03G3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/3094</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in parametric amplifiers </text><reference><text><class-ref scheme="cpc">H03G3/32</class-ref>, <class-ref scheme="cpc">H03G3/34</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G3/32" definition-exists="true" ipc-concordant="H03G3/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/32</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the control being dependent upon ambient noise level or sound level</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G3/34" definition-exists="false" ipc-concordant="H03G3/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/34</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Muting amplifier when no signal is present </text><CPC-specific-text><text>or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G3/341" definition-exists="false" ipc-concordant="H03G3/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/341</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Muting when no signals or only weak signals are present </text><reference><text><class-ref scheme="cpc">H03G3/344</class-ref>, <class-ref scheme="cpc">H03G3/345</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G3/342" definition-exists="false" ipc-concordant="H03G3/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/342</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Muting when some special characteristic of the signal is sensed which distinguishes it from noise, e.g. using speech detector </text><reference><text><class-ref scheme="cpc">H03G3/344</class-ref>, <class-ref scheme="cpc">H03G3/345</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G3/344" definition-exists="false" ipc-concordant="H03G3/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/344</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Muting responsive to the amount of noise (noise squelch) </text><reference><text><class-ref scheme="cpc">H03G3/345</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G3/345" definition-exists="false" ipc-concordant="H03G3/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/345</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Muting during a short period of time when noise pulses are detected, i.e. blanking </text><reference><text><class-ref scheme="cpc">H03G3/348</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03G3/347" definition-exists="false" ipc-concordant="H03G3/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/347</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>dependent on the rate of noise pulses</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G3/348" definition-exists="false" ipc-concordant="H03G3/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G3/348</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Muting in response to a mechanical action or to power supply variations, e.g. during tuning; Click removal circuits</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03G5/00" definition-exists="true" ipc-concordant="H03G5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G5/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Tone control or bandwidth control in amplifiers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G5/005" definition-exists="true" ipc-concordant="H03G5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G5/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of digital signals </text><reference><text><u>see</u> provisionally also <class-ref scheme="cpc">H03G5/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G5/02" definition-exists="true" ipc-concordant="H03G5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G5/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Manually-operated control </text><reference><text>variable bandpass or bandstop filters <class-ref scheme="cpc">H03H7/12</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G5/025" definition-exists="false" ipc-concordant="H03G5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G5/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Equalizers; Volume or gain control in limited frequency bands</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G5/04" definition-exists="false" ipc-concordant="H03G5/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G5/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in untuned amplifiers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G5/06" definition-exists="false" ipc-concordant="H03G5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G5/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having discharge tubes</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G5/08" definition-exists="false" ipc-concordant="H03G5/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G5/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>incorporating negative feedback</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G5/10" definition-exists="false" ipc-concordant="H03G5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G5/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having semiconductor devices</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G5/12" definition-exists="false" ipc-concordant="H03G5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G5/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>incorporating negative feedback</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G5/14" definition-exists="false" ipc-concordant="H03G5/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G5/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in frequency-selective amplifiers</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G5/16" definition-exists="true" ipc-concordant="H03G5/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G5/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Automatic control</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G5/165" definition-exists="true" ipc-concordant="H03G5/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G5/165</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Equalizers; Volume or gain control in limited frequency bands</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G5/18" definition-exists="false" ipc-concordant="H03G5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G5/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in untuned amplifiers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G5/20" definition-exists="false" ipc-concordant="H03G5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G5/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having discharge tubes</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G5/22" definition-exists="false" ipc-concordant="H03G5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G5/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having semiconductor devices</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G5/24" definition-exists="false" ipc-concordant="H03G5/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G5/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in frequency-selective amplifiers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G5/26" definition-exists="false" ipc-concordant="H03G5/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G5/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having discharge tubes</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G5/28" definition-exists="false" ipc-concordant="H03G5/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G5/28</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having semiconductor devices</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03G7/00" definition-exists="true" ipc-concordant="H03G7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G7/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Volume compression or expansion in amplifiers </text><CPC-specific-text><reference><text>frequency dependent <class-ref scheme="cpc">H03G9/00</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G7/001" definition-exists="true" ipc-concordant="H03G7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G7/001</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>without controlling loop </text><reference><text><class-ref scheme="cpc">H03G7/007</class-ref>, <class-ref scheme="cpc">H03G7/02</class-ref>, <class-ref scheme="cpc">H03G7/06</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G7/002" definition-exists="true" ipc-concordant="H03G7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H03G7/002</classification-symbol><class-title date-revised="2016-08-01"><title-part><CPC-specific-text><text>in untuned or low-frequency amplifiers, e.g. audio amplifiers </text><reference><text><class-ref scheme="cpc">H03G7/007</class-ref>, <class-ref scheme="cpc">H03G7/001</class-ref>, <class-ref scheme="cpc">H03G7/008</class-ref>, <class-ref scheme="cpc">H03G7/02</class-ref>, <class-ref scheme="cpc">H03G7/06</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G7/004" definition-exists="false" ipc-concordant="H03G7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G7/004</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using continuously variable impedance devices</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G7/005" definition-exists="false" ipc-concordant="H03G7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G7/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using discontinuously variable devices, e.g. switch-operated</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G7/007" definition-exists="true" ipc-concordant="H03G7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G7/007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of digital or coded signals </text><reference><text><u>see</u> provis. also <class-ref scheme="cpc">H03G7/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G7/008" definition-exists="false" ipc-concordant="H03G7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G7/008</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Control by a pilot signal </text><reference><text><class-ref scheme="cpc">H03G7/007</class-ref>, <class-ref scheme="cpc">H03G7/02</class-ref>, <class-ref scheme="cpc">H03G7/06</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G7/02" definition-exists="false" ipc-concordant="H03G7/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G7/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having discharge tubes</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G7/04" definition-exists="false" ipc-concordant="H03G7/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G7/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>incorporating negative feedback</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G7/06" definition-exists="false" ipc-concordant="H03G7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G7/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having semiconductor devices</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G7/08" definition-exists="false" ipc-concordant="H03G7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G7/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>incorporating negative feedback</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03G9/00" definition-exists="true" ipc-concordant="H03G9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G9/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Combinations of two or more types of control, e.g. gain control and tone control</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G9/005" definition-exists="true" ipc-concordant="H03G9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-07-01" status="published"><classification-symbol>H03G9/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of digital or coded signals</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G9/02" definition-exists="true" ipc-concordant="H03G9/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H03G9/02</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>in untuned amplifiers </text><reference><text>combined tone controls for low and high frequencies <class-ref scheme="cpc">H03G5/00</class-ref> </text><CPC-specific-text><text>; compression or expansion combined with volume control <class-ref scheme="cpc">H03G7/00</class-ref></text></CPC-specific-text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G9/025" definition-exists="true" ipc-concordant="H03G9/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G9/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>frequency-dependent volume compression or expansion, e.g. multiple-band systems </text><reference><text><class-ref scheme="cpc">H03G9/10</class-ref>, <class-ref scheme="cpc">H03G9/18</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G9/04" definition-exists="false" ipc-concordant="H03G9/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G9/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having discharge tubes</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G9/06" definition-exists="false" ipc-concordant="H03G9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G9/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for gain control and tone control</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G9/08" definition-exists="false" ipc-concordant="H03G9/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G9/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>incorporating negative feedback</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G9/10" definition-exists="false" ipc-concordant="H03G9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G9/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for tone control and volume expansion or compression</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G9/12" definition-exists="false" ipc-concordant="H03G9/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G9/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having semiconductor devices</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G9/14" definition-exists="false" ipc-concordant="H03G9/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G9/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for gain control and tone control</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03G9/16" definition-exists="false" ipc-concordant="H03G9/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G9/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>incorporating negative feedback</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03G9/18" definition-exists="false" ipc-concordant="H03G9/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G9/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for tone control and volume expansion or compression</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G9/20" definition-exists="false" ipc-concordant="H03G9/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G9/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in frequency-selective amplifiers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G9/22" definition-exists="false" ipc-concordant="H03G9/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G9/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having discharge tubes</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G9/24" definition-exists="false" ipc-concordant="H03G9/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G9/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having semiconductor devices</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G9/26" definition-exists="false" ipc-concordant="H03G9/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H03G9/26</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>in untuned amplifying stages as well as in frequency-selective amplifying stages </text><reference><text>gain control in both stages <class-ref scheme="cpc">H03G3/00</class-ref>; tone control or bandwidth control <class-ref scheme="cpc">H03G5/00</class-ref> </text><CPC-specific-text><text>; compression or expansion combined with volume control <class-ref scheme="cpc">H03G7/00</class-ref></text></CPC-specific-text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G9/28" definition-exists="false" ipc-concordant="H03G9/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G9/28</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>all amplifying stages having discharge tubes</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G9/30" definition-exists="false" ipc-concordant="H03G9/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G9/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>all amplifying stages having semiconductor devices</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03G11/00" definition-exists="true" ipc-concordant="H03G11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H03G11/00</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Limiting amplitude</text></title-part><title-part><text>Limiting rate of change of amplitude </text><CPC-specific-text><text>; Clipping in general</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G11/002" definition-exists="true" ipc-concordant="H03G11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G11/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>without controlling loop </text><reference><text><class-ref scheme="cpc">H03G11/004</class-ref>, <class-ref scheme="cpc">H03G11/006</class-ref>, <class-ref scheme="cpc">H03G11/008</class-ref>, <class-ref scheme="cpc">H03G11/02</class-ref>, <class-ref scheme="cpc">H03G11/04</class-ref>, <class-ref scheme="cpc">H03G11/06</class-ref>, <class-ref scheme="cpc">H03G11/08</class-ref> take precedence; <u>see</u> provisional also <class-ref scheme="cpc">H03G11/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G11/004" definition-exists="false" ipc-concordant="H03G11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G11/004</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using discharge tubes </text><reference><text><class-ref scheme="cpc">H03G11/008</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G11/006" definition-exists="false" ipc-concordant="H03G11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G11/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in circuits having distributed constants </text><reference><text><class-ref scheme="cpc">H03G11/008</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G11/008" definition-exists="true" ipc-concordant="H03G11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G11/008</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of digital or coded signals </text><reference><text><u>see</u> provis. also <class-ref scheme="cpc">H03G11/00</class-ref>, <class-ref scheme="cpc">H03G11/02</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G11/02" definition-exists="true" ipc-concordant="H03G11/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G11/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by means of diodes </text><reference><CPC-specific-text><text><class-ref scheme="cpc">H03G11/008</class-ref>, </text></CPC-specific-text><text> <class-ref scheme="cpc">H03G11/04</class-ref>, <class-ref scheme="cpc">H03G11/06</class-ref>, <class-ref scheme="cpc">H03G11/08</class-ref> take precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03G11/025" definition-exists="false" ipc-concordant="H03G11/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G11/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in circuits having distributed constants</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G11/04" definition-exists="true" ipc-concordant="H03G11/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G11/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Limiting level dependent on strength of signal</text></title-part><title-part><text>Limiting level dependent on strength of carrier on which signal is modulated </text><CPC-specific-text><reference><text><class-ref scheme="cpc">H03G11/008</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G11/06" definition-exists="false" ipc-concordant="H03G11/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G11/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Limiters of angle-modulated signals</text></CPC-specific-text></title-part><title-part><text>such limiters combined with discriminators </text><reference><text><class-ref scheme="cpc">H03G11/00</class-ref> takes precedence; discriminators having an inherent limiting action <class-ref scheme="cpc">H03D3/00</class-ref></text></reference></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03G11/08" definition-exists="true" ipc-concordant="H03G11/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G11/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Limiting rate of change of amplitude </text><CPC-specific-text><reference><text><class-ref scheme="cpc">H03G11/008</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03G99/00" definition-exists="true" ipc-concordant="H03G99/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03G99/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Subject matter not provided for in other groups of this subclass</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="true" level="6" additional-only="true" sort-key="H03G201/00" date-revised="2013-01-01" status="published"><classification-symbol>H03G2201/00</classification-symbol>
<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="H03G201/00" 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>H03G2201/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indexing scheme relating to subclass <class-ref scheme="cpc">H03G</class-ref></text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03G201/10" 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>H03G2201/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Gain control characterised by the type of controlled element</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03G201/103" 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>H03G2201/103</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>being an amplifying element</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03G201/106" 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>H03G2201/106</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>being attenuating element</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03G201/20" 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>H03G2201/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Gain control characterized by the position of the detection</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03G201/202" 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>H03G2201/202</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>being in baseband</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03G201/204" 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>H03G2201/204</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>being in intermediate frequency</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03G201/206" 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>H03G2201/206</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>being in radio frequency</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03G201/208" 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>H03G2201/208</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>being in power supply of the amplifier</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03G201/30" 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>H03G2201/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Gain control characterized by the type of controlled signal</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03G201/302" 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>H03G2201/302</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>being baseband signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03G201/305" 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>H03G2201/305</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>being intermediate frequency signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03G201/307" 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>H03G2201/307</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>being radio frequency signal</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03G201/40" 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>H03G2201/40</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Combined gain and bias control</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03G201/50" 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>H03G2201/50</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Gain control characterized by the means of gain control</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03G201/502" 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>H03G2201/502</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by switching impedance in feedback loop</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03G201/504" 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>H03G2201/504</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by summing selected parallel amplifying paths, i.e. more amplifying/attenuating paths summed together</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03G201/506" 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>H03G2201/506</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by selecting one parallel amplifying path</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03G201/508" 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>H03G2201/508</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by using look-up tables</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03G201/60" 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>H03G2201/60</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Gain control characterized by varying time constants in control loop</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03G201/603" 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>H03G2201/603</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>time constant being continuous</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03G201/606" 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>H03G2201/606</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>time constant being discrete</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03G201/70" 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>H03G2201/70</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Gain control characterized by the gain control parameter</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03G201/702" 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>H03G2201/702</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>being frequency, e.g. frequency deviations</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03G201/704" 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>H03G2201/704</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>being number of multiplexed channels</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03G201/706" 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>H03G2201/706</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>being quality indicator, e.g. BER,C/I</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03G201/708" 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>H03G2201/708</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>being temperature</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></classification-item></class-scheme>