US PATENT SUBCLASS 379 / 410
.~.~ Echo cancellation (e.g., phase opposition)

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

399  DF  SUBSCRIBER LINE OR TRANSMISSION LINE INTERFACE {5}
406  DF  .~ Echo suppression, antisinging, or reverse path blocking {4}
410.~.~ Echo cancellation (e.g., phase opposition) {1}
411  DF  .~.~.~> Having transversal filter

DEFINITION

Classification: 379/410

Echo cancellation (e.g., phase opposition):

(under subclass 406) Subject matter which produces a replica of the undesired signal and offsetting the undesired signal by said replica.

(1) Note. An example of such signal offsetting would include combining the undesired signal with a phase opposed

replica thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:

3, for testing of an echo suppressor or canceller.

392, for an anti-sidetone device in a telephone terminal or substation.