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| SECTION H– ELECTRICITY |
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| H 03 | BASIC ELECTRONIC CIRCUITRY |
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| H 03 B | GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS (measuring, testing G 01 R; generators adapted for electrophonic musical instruments G 10 H; speech synthesis G 10 L; masers, lasers H 01 S; dynamo-electric machines H 02 K; power inverter circuits H 02 M; by using pulse techniques H 03 K; automatic control of generators H 03 L; starting, synchronisation or stabilisation of generators where the type of generator is irrelevant or unspecified H 03 L; generation of oscillations in plasma H 05 H) |
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| H 03 C | MODULATION (measuring, testing G 01 R; masers, lasers H 01 S; modulators specially adapted for use in dc amplifiers H 03 F 3/38; modulating pulses H 03 K 7/00; so-called modulators capable only of switching between predetermined states of amplitude, frequency or phase H 03 K 17/00, H 04 L; coding, decoding or code conversion, in general H 03 M; synchronous modulators specially adapted for colour television H 04 N 9/65) |
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| H 03 D | DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER (masers, lasers H 01 S; circuits capable of acting both as modulator and demodulator H 03 C; details applicable to both modulators and frequency-changers H 03 C; demodulating pulses H 03 K 9/00; transforming types of pulse modulation H 03 K 11/00; coding, decoding or code conversion, in general H 03 M; repeater stations H 04 B 7/14; demodulators adapted for ac systems of digital-information transmission H 04 L 27/00; synchronous demodulators adapted for colour television H 04 N 9/66) |
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| H 03 F | AMPLIFIERS (measuring, testing G 01 R; optical parametric amplifiers G 02 F; circuit arrangements with secondary emission tubes H 01 J 43/30; masers, lasers H 01 S; control of amplification H 03 G; coupling arrangements independent of the nature of the amplifier, voltage dividers H 03 H; amplifiers capable only of dealing with pulses H 03 K; repeater circuits in transmission lines H 04 B 3/36, H 04 B 3/58; application of speech amplifiers in telephonic communication H 04 M 1/60, H 04 M 3/40) |
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| H 03 G | CONTROL OF AMPLIFICATION (impedance networks, e.g. attenuators, H 03 H; control of transmission in lines H 04 B 3/04) |
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| H 03 H | IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (measuring, testing G 01 R; arrangements for producing a reverberation or echo sound G 10 K 15/08; impedance networks or resonators consisting of distributed impedances, e.g. of the waveguide type, H 01 P; control of amplification, e.g. bandwidth control of amplifiers, H 03 G; tuning resonant circuits, e.g. tuning coupled resonant circuits, H 03 J; networks for modifying the frequency characteristics of communication systems H 04 B) |
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| H 03 J | TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS (indicating arrangements for measuring G 01 D; measuring, testing G 01 R; remote-control in general G 05, G 08; automatic control or stabilisation of generators H 03 L) |
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| H 03 K | PULSE TECHNIQUE (measuring pulse characteristics G 01 R; mechanical counters having an electrical input G 06 M; information storage devices in general G 11; sample-and-hold arrangements in electric analogue stores G 11 C 27/02; construction of switches involving contact making and breaking for generation of pulses, e.g. by using a moving magnet, H 01 H; static conversion of electric power H 02 M; generation of oscillations by circuits employing active elements which operate in a non-switching manner H 03 B; modulating sinusoidal oscillations with pulses H 03 C, H 04 L; discriminator circuits involving pulse counting H 03 D; automatic control of generators H 03 L; starting, synchronisation, or stabilisation of generators where the type of generator is irrelevant or unspecified H 03 L; coding, decoding or code conversion, in general H 03 M) |
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| H 03 L | AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES (of dynamo-electric generators H 02 P) |
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| H 03 M | CODING; DECODING OR CODE CONVERSION, IN GENERAL (using fluidic means F 15 C 4/00; optical analogue/digital converters G 02 F 7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G 01 D, G 01 R, G 06 F, G 06 T, G 09 G, G 10 L, G 11 B, G 11 C, H 04 L, H 04 M, H 04 N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G 09 C) |
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