US PATENT SUBCLASS 379 / 78
.~.~.~ Acoustic coupling

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}
78.~.~.~ Acoustic coupling

DEFINITION

Classification: 379/78

Acoustic coupling:

(under subclass 70) subject matter wherein the connection between the telephone system component and the reproducer or recorder is effected by a sound wave produced and detected by a complementary pair of transducers.

(1) Note. Such subject matter often involves a pair of such acoustic links in opposite directions.

SEE OR SEARCH THIS CLASS, SUBCLASS:

444, for an acoustic telephone system coupler.