(under subclass 259) Subject matter where the digital information or pulses to be transmitted vary the phase angle or frequency of a carrier wave.
(1) Note. In angle modulation, the total energy content of the output spectrum is generally kept constant. The amplitude of the carrier component depends on the modulation index.
SEE OR SEARCH THIS CLASS, SUBCLASS:
211, for angle modulated repeaters.
223, for angle modulated carrier pulse transceivers.
302, for angle modulated carrier pulse transmitters.
322, for angle modulated carrier pulse receivers. SEE OR SEARCH CLASS
329, Demodulators,
315+, for frequency demodulators, subclasses 300+ for a frequency shift keying demodulator, per se, and subclasses 304+ for a phase shift keying demodulator, per se.
332, Modulators,
117+, for a frequency modulator, per se, and subclasses 144+ for a phase modulator, per se.
359, Optics: Systems (Including Communication) and Elements,
182, and 183 for an angle modulated light wave transmitter.
370, Multiplex Communications,
215, for phase modulation, and subclass 483 for angle modulation.
