Echo canceller

Details Echo canceller Echo canceller

2007-12-04

2007-12-04

Harold, Jefferey F (Department: 2614)

Telephonic communications

Echo cancellation or suppression

Residual echo cancellation

C379S406060, C379S406070, C379S406110

Reexamination Certificate

active

11141793

ABSTRACT:
An echo canceller used in a vocal information exchange system operates in such a circumstance that a sound wave released by a speaker is picked up by a microphone unintentionally and works to suppress an echo signal included in the audio signal produced by the microphone by using a pseudo echo signal which is produced based on the incoming audio signal to be fed to the speaker and produce a subtracted audio signal which becomes the outgoing audio signal, with the echo signal being suppressed based on the accurately-calculated degree of echo suppression achieved by use of the pseudo echo signal.

REFERENCES:
patent: 6760436 (2004-07-01), Takada
patent: 6961422 (2005-11-01), Boland

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