| IPC 7 English version |
| H03G-H03G01108 |
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| SECTION H – ELECTRICITY |
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| H 03 | BASIC ELECTRONIC CIRCUITRY |
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| H 03 G | CONTROL OF AMPLIFICATION (impedance networks, e.g. attenuators, H03H; control of transmission in lines H04B 3/04) |
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| Notes |
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| (1) | This subclass covers: |
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| – | control of gain of amplifiers or frequency-changers; |
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| – | control of frequency range of amplifiers; |
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| – | limiting amplitude or rate of change of amplitude. |
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| (2) | Attention is drawn to the Note following the title of subclass H03F. [3] |
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| Subclass Index |
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| GAIN CONTROL |
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| TONE CONTROL |
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| COMPRESSORS OR EXPANDERS; LIMITERS |
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| COMBINATION OF TWO OR MORE TYPES OF CONTROL |
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| DETAILS |
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1/ | 00 | Details of arrangements for controlling amplification |
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1/ | 02 | . | Remote control of amplification, tone, or bandwidth (remote control in general G05, G08; combined with remote tuning or selection of resonant circuits H03J) |
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1/ | 04 | . | Modifications of control circuit to reduce distortion caused by control (modifications to reduce influence of variations of internal impedance of amplifying elements caused by control H03F 1/08) |
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3/ | 00 | Gain control in amplifiers or frequency changers (gated amplifiers H03F 3/72; peculiar to television receivers H04N) |
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3/ | 02 | . | Manually-operated control |
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3/ | 04 | . | . | in untuned amplifiers |
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3/ | 06 | . | . | . | having discharge tubes |
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3/ | 08 | . | . | . | . | incorporating negative feedback |
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3/ | 10 | . | . | . | having semiconductor devices |
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3/ | 12 | . | . | . | . | incorporating negative feedback |
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3/ | 14 | . | . | in frequency-selective amplifiers |
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3/ | 16 | . | . | . | having discharge tubes |
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3/ | 18 | . | . | . | having semiconductor devices |
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3/ | 20 | . | Automatic control (combined with volume compression or expansion H03G 7/00) |
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3/ | 22 | . | . | in amplifiers having discharge tubes |
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3/ | 24 | . | . | . | Control dependent upon ambient noise level or sound level |
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3/ | 26 | . | . | . | Muting amplifier when no signal is present |
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3/ | 28 | . | . | . | . | in frequency-modulation receivers |
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3/ | 30 | . | . | in amplifiers having semiconductor devices |
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3/ | 32 | . | . | . | the control being dependent upon ambient noise level or sound level |
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3/ | 34 | . | . | . | Muting amplifier when no signal is present |
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5/ | 00 | Tone control or bandwidth control in amplifiers |
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5/ | 02 | . | Manually-operated control (variable bandpass or bandstop filters H03H 7/12) |
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5/ | 04 | . | . | in untuned amplifiers |
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5/ | 06 | . | . | . | having discharge tubes |
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5/ | 08 | . | . | . | . | incorporating negative feedback |
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5/ | 10 | . | . | . | having semiconductor devices |
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5/ | 12 | . | . | . | . | incorporating negative feedback |
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5/ | 14 | . | . | in frequency-selective amplifiers |
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5/ | 16 | . | Automatic control |
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5/ | 18 | . | . | in untuned amplifiers |
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5/ | 20 | . | . | . | having discharge tubes |
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5/ | 22 | . | . | . | having semiconductor devices |
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5/ | 24 | . | . | in frequency-selective amplifiers |
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5/ | 26 | . | . | . | having discharge tubes |
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5/ | 28 | . | . | . | having semiconductor devices |
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7/ | 00 | Volume compression or expansion in amplifiers |
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7/ | 02 | . | having discharge tubes |
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7/ | 04 | . | . | incorporating negative feedback |
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7/ | 06 | . | having semiconductor devices |
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7/ | 08 | . | . | incorporating negative feedback |
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9/ | 00 | Combinations of two or more types of control, e.g. gain control and tone control |
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9/ | 02 | . | in untuned amplifiers (combined tone controls for low and high frequencies H03G 5/00) |
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9/ | 04 | . | . | having discharge tubes |
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9/ | 06 | . | . | . | for gain control and tone control |
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9/ | 08 | . | . | . | . | incorporating negative feedback |
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9/ | 10 | . | . | . | for tone control and volume expansion or compression |
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9/ | 12 | . | . | having semiconductor devices |
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9/ | 14 | . | . | . | for gain control and tone control |
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9/ | 16 | . | . | . | . | incorporating negative feedback |
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9/ | 18 | . | . | . | for tone control and volume expansion or compression |
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9/ | 20 | . | in frequency-selective amplifiers |
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9/ | 22 | . | . | having discharge tubes |
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9/ | 24 | . | . | having semiconductor devices |
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9/ | 26 | . | in untuned amplifying stages as well as in frequency-selective amplifying stages (gain control in both stages H03G 3/00; tone control or bandwidth control H03G 5/00) |
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9/ | 28 | . | . | all amplifying stages having discharge tubes |
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9/ | 30 | . | . | all amplifying stages having semiconductor devices |
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11/ | 00 | Limiting amplitude; Limiting rate of change of amplitude |
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11/ | 02 | . | by means of diodes (H03G 11/04, H03G 11/06, H03G 11/08 take precedence) |
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11/ | 04 | . | Limiting level dependent on strength of signal; Limiting level dependent on strength of carrier on which signal is modulated |
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11/ | 06 | . | Limiters of angle-modulated signals; such limiters combined with discriminators (discriminators having an inherent limiting action H03D 3/00) |
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11/ | 08 | . | Limiting rate of change of amplitude |
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