This subclass covers only modulation, keying, or interruption of sinusoidal oscillations or electromagnetic waves, the modulating signal having any desired waveform.
In this subclass, circuits usable both as modulator and demodulator are classified in the group dealing with the type of modulator involved.
linear amplification, there being linear relationship between the amplitudes of input and output, and the output having substantially the same waveform as the input;
dielectric amplifiers, magnetic amplifiers, and parametric amplifiers when used as oscillators or frequency-changers;
constructions of active elements of dielectric amplifiers and parametric amplifiers if no provision exists elsewhere.
This subclass covers also the control of tuning, including the combined control of tuning and other functions, e.g. combinations of tuning control and volume control, combinations of control of local oscillator and of supplementary resonant circuits. [3]
methods, circuits, devices, or apparatus using active elements operating in a discontinuous or switching manner for generating, counting, amplifying, shaping, modulating, demodulating, or otherwise manipulating signals;
electronic switching not involving contact-making and braking;
logic circuits handling electric pulses.
In this subclass, the following expression is used with the meaning indicated:
"active element" exercises control over the conversion of input energy into an oscillation or a discontinuous flow of energy.
AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES (of dynamo-electric generators Fulltext... Hierarchy... Expanded...H02P) [3]
H03L
Note(s)
This subclass covers:
automatic control circuits for generators of electronic oscillations or pulses; [3]
starting, synchronisation, or stabilisation circuits for generators where the type of generator is irrelevant or unspecified. [3]