CONTROL OF ECHO CANCELLATION FILTER

摘要

PROBLEM TO BE SOLVED: To provide a method and device for controlling an echo cancellation filter. SOLUTION: This method of controlling an echo cancellation filter (36) comprises: determining (22) coefficients (H1) of an adaptive filter (42) representative of an acoustic channel between an acoustic signal emitted and a microphone signal; temporal smoothing (24) of the coefficients of the adaptive filter; determining (26) an estimated echo (z2(n)) by filtering the acoustic signal (x(n)) emitted with the smoothed coefficients; estimating properties of the estimated echo; estimating the same properties on the microphone signal (y(n)); comparing between the properties of the estimated echo and the properties of the microphone signal so as to evaluate the presence of a signal (pu(n)) other than an echo signal (z(n)) in the microphone signal; and controlling the filter for canceling an echo in the microphone signal, as a function of the comparison. COPYRIGHT: (C)2008,JPO&INPIT