US PATENT SUBCLASS 341 / 181
.~.~ Carrier frequency variation

Current as of: June, 1999
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341 /   HD   CODED DATA GENERATION OR CONVERSION

173  DF  CODE GENERATOR OR TRANSMITTER {8}
178  DF  .~ With variable pulse spacing or grouping {5}
181.~.~ Carrier frequency variation

DEFINITION

Classification: 341/181

Carrier frequency variation:

(under subclass 178) Subject matter in which the frequency of the carrier upon which the pulses are modulated is varied.

SEE OR SEARCH CLASS

375, Pulse or Digital Communications,

303+, for transmission of a digital signal having arbitrary message content by frequency shift keying.