US PATENT SUBCLASS 379 / 391
.~ Sidetone control or hybrid circuit (e.g., induction coil)

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

387  DF  SUBSTATION OR TERMINAL CIRCUITRY {7}
391.~ Sidetone control or hybrid circuit (e.g., induction coil) {1}
392  DF  .~.~> Suppression (e.g., antisidetone)

DEFINITION

Classification: 379/391

Sidetone control or hybrid circuit (e.g., induction coil):

(under subclass 387) Subject matter for maintaining that portion of the speech signal which is transmitted from a telephone transmitter and reproduced at adjacent receiver at a desired degree of separation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

402, for similar subject matter at a telephone line interface.