US PATENT SUBCLASS 379 / 406
.~ Echo suppression, antisinging, or reverse path blocking

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

399  DF  SUBSCRIBER LINE OR TRANSMISSION LINE INTERFACE {5}
406.~ Echo suppression, antisinging, or reverse path blocking {4}
407  DF  .~.~> Disable or inhibit
408  DF  .~.~> Control by pilot frequency signal
409  DF  .~.~> Having variolosser or attenuator
410  DF  .~.~> Echo cancellation (e.g., phase opposition) {1}

DEFINITION

Classification: 379/406

Echo suppression, antisinging, or reverse path blocking:

(under subclass 399) Subject matter including circuitry to prevent undesired reflection, oscillation, or signal transmission.

SEE OR SEARCH THIS CLASS, SUBCLASS:

3, for testing an echo suppressor.

392, for sidetone suppression in a terminal or substation.