US PATENT SUBCLASS 375 / 335
.~.~.~ More than two frequencies

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  DF  .~.~ Frequency shift keying {3}
335.~.~.~ More than two frequencies

DEFINITION

Classification: 375/335

More than two frequencies:

(under subclass 334) Subject matter in which the input signal detected has three or more frequencies representing three or more pieces of information.