Network echo canceller

Details Network echo canceller Network echo canceller

H - Electricity

04

B

H04B 3/20 (2006.01) G10L 19/00 (2006.01) H04B 3/23 (2006.01) H04M 9/08 (2006.01)

Patent

CA 2123002

An echo canceller and method for cancelling in a return channel signal an echoed receive channel signal where the echoed receive channel signal is combined by an echo channel (142) with an input return channel signal. A control unit (152) determines from the receive channel signal, the combined signal, and first and second echo residuals, one of a plurality of control states wherein a first control state is indicative of a receive channel signal above a first predetermined energy level, wherein when the control unit (152) is in the first control state it generates the first control signal and generates the second control signal when at least one of a first energy ratio of the first echo residual signal and the combined signal exceed a predetermined level.

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