US PATENT SUBCLASS 379 / 360
.~.~ Voice frequency band signalling (e.g., reed devices)

Current as of: June, 1999
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379 /   HD   TELEPHONIC COMMUNICATIONS

350  DF  SUPERVISORY OR CONTROL LINE SIGNALLING {5}
352  DF  .~ Substation originated {8}
360.~.~ Voice frequency band signalling (e.g., reed devices) {1}
361  DF  .~.~.~> Electronic (e.g., tone generator)

DEFINITION

Classification: 379/360

Voice frequency band signalling (e.g., reed devices):

(under subclass 352) Subject matter wherein of tones within the audible sound spectrum and which have distinct frequencies to perform selective control.

(1) Note. The voice frequency tones are often combination of frequencies.

(2) Note. This subclass also includes read devices.

SEE OR SEARCH THIS CLASS, SUBCLASS:

235, for voice frequency signalling between exchanges.

282+, for a voice frequency call address signal receiver.

341+, for tone repeaters. 386, for voice frequency line signalling reception.

SEE OR SEARCH CLASS

341, Coded Data Generation or Conversion, appropriate subclasses for code converters.

375, Pulse or Digital Communications,

272+, and 303+ for voice frequency digital communications and transmitters.