Method and apparatus for echo cancellation, digit filter...

Details Method and apparatus for echo cancellation, digit filter... Method and apparatus for echo cancellation, digit filter...

2005-06-24

2009-08-18

Matar, Ahmad F (Department: 2614)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S413020

Reexamination Certificate

active

07577248

ABSTRACT:
Hands-free phones with voice activity detection using a comparison of frame power estimate with an adaptive frame noise power estimate, automatic gain control with fast adaptation and minimal speech distortion, echo cancellation updated in the frequency domain with stepsize optimization and smoothed spectral whitening, and echo suppression with adaptive talking-state transitions.

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