(under subclass 560) Subject matter in which modulator means
are provided wherein the command signal or feedback signal either frequency modulates, or phase modulates a system carrier. The system carrier is a wave suitable for being modulated to transmit intelligence. The modulation represents the information, and the original wave is used only as the carrier of the modulation. Combinations of phase and frequency modulation are commonly referred to as frequency modulation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
684, for servo systems in which the novelty lies in the modulator which may be a frequency or phase modulator.
SEE OR SEARCH CLASS
332, Modulators,
117+, for a frequency modulator and subclasses 144+ for a phase modulator, per se. 340, Communications: Electrical,
870.18, 870.25, and 870.26 for frequency or phase modulated telemetering systems and subclass 351, for code transmitters in which the frequency of the carrier is modulated in accordance with the code.
342, Communications: Directive Radio Wave Systems and Devices (e.g., Radar Navigation),
128+, 134+, 200+, and 202 for radio wave communications.
455, Telecommunications,
42+, for frequency or phase modulated carrier systems, per se.
