Echo canceller

Details Echo canceller Echo canceller

2005-08-23

2005-08-23

Harold, Jefferey F. (Department: 2644)

Telephonic communications

Echo cancellation or suppression

Residual echo cancellation

C379S406060, C379S406080, C379S406110

Reexamination Certificate

active

06934386

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

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