| IPC 7 English version |
| H03C-H03C00704 |
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| SECTION H – ELECTRICITY |
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| H 03 | BASIC ELECTRONIC CIRCUITRY |
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| H 03 C | MODULATION (measuring, testing G01R; masers, lasers H01S; modulators specially adapted for use in dc amplifiers H03F 3/38; modulating pulses H03K 7/00; so-called modulators capable only of switching between predetermined states of amplitude, frequency or phase H03K 17/00, H04L; coding, decoding or code conversion, in general H03M; synchronous modulators specially adapted for colour television H04N 9/65) |
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| Notes |
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| (1) | This subclass covers only modulation, keying, or interruption of sinusoidal oscillations or electromagnetic waves, the modulating signal having any desired waveform. |
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| (2) | In this subclass, circuits usable both as modulator and demodulator are classified in the group dealing with the type of modulator involved. |
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1/ | 00 | Amplitude modulation (H03C 5/00, H03C 7/00 take precedence) |
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1/ | 02 | . | Details |
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1/ | 04 | . | . | Means in, or combined with, modulating stage for reducing angle modulation |
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1/ | 06 | . | . | Modifications of modulator to reduce distortion, e.g. by feedback, and clearly applicable to more than one type of modulator |
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1/ | 08 | . | by means of variable impedance element (H03C 1/28 to H03C 1/34, H03C 1/46 to H03C 1/52, H03C 1/62 take precedence) |
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1/ | 10 | . | . | the element being a current-dependent inductor |
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1/ | 12 | . | . | the element being a voltage-dependent capacitor |
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1/ | 14 | . | . | the element being a diode |
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1/ | 16 | . | by means of discharge device having at least three electrodes (H03C 1/28 to H03C 1/34, H03C 1/50, H03C 1/52, H03C 1/62 take precedence) |
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1/ | 18 | . | . | carrier applied to control grid |
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1/ | 20 | . | . | . | modulating signal applied to anode |
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1/ | 22 | . | . | . | modulating signal applied to same grid |
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1/ | 24 | . | . | . | modulating signal applied to different grid |
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1/ | 26 | . | . | . | modulating signal applied to cathode |
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1/ | 28 | . | by means of transit-time tube |
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1/ | 30 | . | . | by means of a magnetron |
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1/ | 32 | . | by deflection of electron beam in discharge tube |
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1/ | 34 | . | by means of light-sensitive element |
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1/ | 36 | . | by means of semiconductor device having at least three electrodes (H03C 1/34, H03C 1/50, H03C 1/52, H03C 1/62 take precedence) |
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1/ | 38 | . | . | carrier applied to base of a transistor |
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1/ | 40 | . | . | . | modulating signal applied to collector |
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1/ | 42 | . | . | . | modulating signal applied to base |
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1/ | 44 | . | . | . | modulating signal applied to emitter |
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1/ | 46 | . | Modulators with mechanically- or acoustically-driven parts |
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1/ | 48 | . | by means of Hall-effect devices |
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1/ | 50 | . | by converting angle modulation to amplitude modulation (H03C 1/28 to H03C 1/34, H03C 1/46, H03C 1/48 take precedence) |
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1/ | 52 | . | Modulators in which carrier or one sideband is wholly or partially suppressed (H03C 1/28 to H03C 1/34, H03C 1/46, H03C 1/48 take precedence) |
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1/ | 54 | . | . | Balanced modulators, e.g. bridge type, ring type, double balanced type |
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1/ | 56 | . | . | . | comprising variable two-pole elements only |
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1/ | 58 | . | . | . | . | comprising diodes |
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1/ | 60 | . | . | with one sideband wholly or partially suppressed |
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1/ | 62 | . | Modulators in which amplitude of carrier component in output is dependent upon strength of modulating signal, e.g. no carrier output when no modulating signal is present (H03C 1/28 to H03C 1/34, H03C 1/46, H03C 1/48 take precedence) |
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3/ | 00 | Angle modulation (H03C 5/00, H03C 7/00 take precedence) |
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3/ | 02 | . | Details |
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3/ | 04 | . | . | Means in, or combined with, modulating stage for reducing amplitude modulation |
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3/ | 06 | . | . | Means for changing frequency deviation |
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3/ | 08 | . | . | Modifications of modulator to linearise modulation, e.g. by feedback, and clearly applicable to more than one type of modulator |
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3/ | 09 | . | . | Modifications of modulator for regulating the mean frequency [3] |
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3/ | 10 | . | by means of variable impedance (H03C 3/30 to H03C 3/38 take precedence) |
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3/ | 12 | . | . | by means of a variable reactive element |
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3/ | 14 | . | . | . | simulated by circuit comprising active element with at least three electrodes, e.g. reactance-tube circuit |
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3/ | 16 | . | . | . | . | in which the active element simultaneously serves as the active element of an oscillator |
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3/ | 18 | . | . | . | the element being a current-dependent inductor |
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3/ | 20 | . | . | . | the element being a voltage-dependent capacitor |
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3/ | 22 | . | . | . | the element being a semiconductor diode, e.g. varicap diode |
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3/ | 24 | . | . | by means of a variable resistive element, e.g. tube |
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3/ | 26 | . | . | . | comprising two elements controlled in push-pull by modulating signal |
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3/ | 28 | . | . | using variable impedance driven mechanically or acoustically |
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3/ | 30 | . | by means of transit-time tube |
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3/ | 32 | . | . | the tube being a magnetron |
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3/ | 34 | . | by deflection of electron beam in discharge tube |
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3/ | 36 | . | by means of light-sensitive element |
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3/ | 38 | . | by converting amplitude modulation to angle modulation |
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3/ | 40 | . | . | using two signal paths the outputs of which have a predetermined phase difference and at least one output being amplitude-modulated |
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3/ | 42 | . | by means of electromechanical devices (H03C 3/28 takes precedence) [3] |
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5/ | 00 | Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal (H03C 7/00 takes precedence) |
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5/ | 02 | . | by means of transit-time tube |
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5/ | 04 | . | . | the tube being a magnetron |
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5/ | 06 | . | by deflection of electron beam in discharge tube |
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7/ | 00 | Modulating electromagnetic waves (devices or arrangements for the modulation of light G02F 1/00; for generating oscillations H03B, H03K) |
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7/ | 02 | . | in transmission line, waveguide, cavity resonator, or radiation field of aerial |
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7/ | 04 | . | . | Polarisation of transmitted wave being modulated |
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