US PATENT SUBCLASS 375 / 334
.~.~ Frequency shift keying

Current as of: June, 1999
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375 /   HD   PULSE OR DIGITAL COMMUNICATIONS

316  DF  RECEIVERS {9}
322  DF  .~ Angle modulation {4}
334.~.~ Frequency shift keying {3}
335  DF  .~.~.~> More than two frequencies
336  DF  .~.~.~> Minimum shift keying
337  DF  .~.~.~> Separate mark and space channels

DEFINITION

Classification: 375/334

Frequency shift keying:

(under subclass 322) Subject matter where the carrier has been modulated by shifting its frequency in accordance with the pulses transmitted.

SEE OR SEARCH THIS CLASS, SUBCLASS:

211, for frequency shift keying repeaters.

223, for frequency shift keying transceivers.

272+, for frequency shift keying systems.

303+, for frequency shift keying transmitters.

SEE OR SEARCH CLASS

331, Oscillators, 179, for frequency shift keying of oscillators.

359, Optics: Systems (Including Communication) and Elements,

182, for a frequency modulated light wave transmitter.