Methods and apparatus for controlling echo suppression in commun

Details Methods and apparatus for controlling echo suppression in commun Methods and apparatus for controlling echo suppression in commun

1998-01-09

2000-11-14

Chan, Wing F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379407, 381 941, H04M 900

Patent

active

061480789

ABSTRACT:
Methods and apparatus for controlling echo suppressors provide superior echo attenuation while optimizing perceived signal quality under a variety of conditions. The disclosed techniques provide desired levels of echo attenuation while minimizing the likelihood that an echo suppressor will introduces more attenuation, and thus more signal distortion, than is necessary. In a first exemplary embodiment, an acoustic echo suppressor is deactivated when a voice activity detector indicates that a far-end communications signal does not include a speech component. In a second exemplary embodiment, an attenuation factor of an active acoustic echo canceler is adjusted based upon whether a voice activity detector indicates that a near-end communications signal includes a near-end speech component. In a third exemplary embodiment, a level of attenuation provided by an acoustic echo canceler is adjusted based upon a measured ratio of voice to noise in an audio input to the acoustic echo canceler.

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patent: 5434916 (1995-07-01), Hasegawa
patent: 5475731 (1995-12-01), Rasmusson
patent: 5619566 (1997-04-01), Fogel
patent: 5790657 (1998-08-01), Fujiwara

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