Echo canceller employing dual-h architecture having improved...

Details Echo canceller employing dual-h architecture having improved... Echo canceller employing dual-h architecture having improved...

H - Electricity

04

M

H04M 9/08 (2006.01) H04B 3/23 (2006.01)

Patent

CA 2614594

An echo canceller is set forth that includes a first digital filter that receives a far-end signal and that has non-adaptive tap coefficients that simulate an echo response, a summing circuit that subtracts a filtered far-end output of the first digital filter from a signal-plus-echo signal to generate an echo compensated signal for transmission to a far-end, a second digital filter that receives the far-end signal and that has adaptive tap coefficients that simulate the echo response, the adaptive tap coefficients being updated during a call, a coefficient transfer controller that transfers the adaptive tap coefficients to replace the tap coefficients when a set of predetermined conditions exists, and a non-linear echo path detector that detects a non- linear echo path condition in response to a transfer density value corresponding to a number of transfers executed by the coefficient transfer controller.

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