US PATENT SUBCLASS 455 / 36.1
.~.~ Plural tones

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.~.~ Plural tones {1}
37.1  DF  .~.~.~> Difference frequency

DEFINITION

Classification: 455/36.1

Plural tones:

(under subclass 35.1) Subject matter wherein more than two audio tones are transmitted to control the audio section operating condition.