US PATENT SUBCLASS 455 / 37.1
.~.~.~ Difference frequency

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

31.1  DF  SYSTEM WITH RECEIVER SELECTION {4}
35.1  DF  .~ Tone coded squelch {1}
36.1  DF  .~.~ Plural tones {1}
37.1.~.~.~ Difference frequency

DEFINITION

Classification: 455/37.1

Difference frequency:

(under subclass 36.1) Subject matter wherein the distinction in frequency between two transmitted audio tones is used.