US PATENT SUBCLASS 375 / 269
.~.~ With phase or frequency shift keying

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

259  DF  SYSTEMS USING ALTERNATING OR PULSATING CURRENT {4}
268  DF  .~ Amplitude modulation {2}
269.~.~ With phase or frequency shift keying

DEFINITION

Classification: 375/269

With phase or frequency shift keying:

(under subclass 268) Subject matter wherein the phase or frequency of the amplitude modulated carrier wave is shifted between at least two phases or frequencies.

SEE OR SEARCH THIS CLASS, SUBCLASS:

273, for phase shift keying with additional frequency shift keying.

SEE OR SEARCH CLASS

332, Modulators,

120+, for a frequency modulator incorporating amplitude modulation and subclass 145 for a phase modulator incorporating amplitude modulation.