Method and apparatus for echo canceller automatic gain control

Details Method and apparatus for echo canceller automatic gain control Method and apparatus for echo canceller automatic gain control

2005-01-04

2005-01-04

Isen, Forester W. (Department: 2644)

Telephonic communications

Echo cancellation or suppression

C379S406020, C379S406030, C379S406040, C379S406060, C379S406070, C379S406080, C379S406090, C379S406110, C379S406140

Reexamination Certificate

active

06839427

ABSTRACT:
A method and apparatus that performs specific automatic gain control in an echo canceller (16). The disclosed method and apparatus utilize a low complexity algorithm that performs automatic gain control to achieve greater speed of convergence of the echo canceller (16) and an increased ability to distinguish between near-end speech and echo through the use of specific automatic gain control. A double talk threshold of the echo canceller is adjusted by using, in part, computed gains of inbound and outbound signals internally within the echo canceller in order to adjust the echo canceller double talk threshold.

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patent: 20020076037 (2002-06-01), Nishimura et al.

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