US PATENT SUBCLASS 340 / 825.58
.~.~ Phase or frequency shift keying

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

825  DF  SELECTIVE {23}
825.57  DF  .~ Pulse responsive actuation {5}
825.58.~.~ Phase or frequency shift keying

DEFINITION

Classification: 340/825.58

Phase or frequency shift keying:

(under subclass 825.57) Subject matter wherein the control signal variation is a shift in the instantaneous frequency thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:

825.71+, for control by a signal frequency variation, in general.

SEE OR SEARCH CLASS

375, Pulse or Digital Communications,

272+, for frequency shift keying in communication systems for messages of arbitrary content.