US PATENT SUBCLASS 379 / 80
.~.~.~.~ Voice signal presence responsive

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

67.1  DF  AUDIO MESSAGE STORAGE, RETRIEVAL, OR SYNTHESIS {13}
68  DF  .~ Dynamic audio signal recording or reproduction {4}
70  DF  .~.~ Call intercept or answering {7}
79  DF  .~.~.~ With specified call initiated cycle control circuitry {4}
80.~.~.~.~ Voice signal presence responsive

DEFINITION

Classification: 379/80

Voice signal presence responsive:

(under subclass 79) Subject matter wherein the cycle control circuitry is responsive to the continuation, cessation, or absence of an incoming audio signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:

81, for similar subject matter responsive to any other line condition.

420, for voice control of a telephone.

SEE OR SEARCH CLASS

369, Dynamic Information Storage or Retrieval,

50, for voice control of a recording system.