Echo canceller capable of cancelling an echo signal at a...

Details Echo canceller capable of cancelling an echo signal at a... Echo canceller capable of cancelling an echo signal at a...

H - Electricity

04

B

H04B 3/23 (2006.01)

Patent

CA 2156943

An echo canceller (30) cancels an echo signal produced on a transmission path (14) on the basis of a received signal received through a reception path (15). The echo canceller comprises an adaptive filter (31) for producing a pseudo-echo signal from the received signal in accordance with tap gains. A producing section (19, 20) produces an error signal representative of an error level between the echo signal and the pseudo-echo signal. A supplying section (21, 32) supplies the adaptive filter with selected ones of the tap gains memorized in a memory section (18) when the error level is less than a predetermined threshold level. The adaptive filter renews the selected ones of the tap gains into renewal tap gains in accordance with the received signal and the error signal to store the renewal tap gains as the selected ones of the tap gains in the memory section.

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