METHOD AND APPARATUS FOR REDUCING ECHO

摘要

The embodiments of the present disclosure provide a method and an apparatus for reducing an echo, which apply a first stage adaptive filter to a downlink reference signal to obtain a first stage filtered signal and a first error signal; after performing a K-path gain process and a K-path pre-distortion process to the downlink reference signal, apply the at least one second stage adaptive filter to a K-path pre-distorted signal to obtain a second stage filtered signal and a second error signal; and perform a minimum value fusion process to the first error signal and the second error signal so as to obtain a residue signal, which is considered as a final output of adaptive echo cancellation. Accordingly, the present disclosure realizes steadily providing a relatively high echo loss under a circumstance that a speaker suffers a relatively great distortion.

主权项

1. A method for reducing an echo, comprising:
invoking a first stage adaptive filter corresponding to a downlink reference signal x(t), and performing a first filtering process to the downlink reference signal x(t) so as to obtain a first stage filtered signal y0(t); subtracting a target signal by the first stage filtered signal y0(t) so as to obtain a first error signal e0(t); performing a K-path gain process to the downlink reference signal x(t) so as to obtain a K-path pre-processed signal, where K is a positive integer; performing a pre-distortion process to the K-path pre-processed signal so as to obtain a corresponding K-path pre-distorted signal rk(t) (k=1, 2, . . . , K); invoking at least one second stage adaptive filter corresponding to the K-path pre-distorted signal, and performing a second filtering process to the K-path pre-distorted signal so as to obtain a corresponding K-path second stage filtered signal yk(t); subtracting the first error signal e0(t) by the K-path second stage filtered signal yk(t) so as to obtain a second error signal ek(t), wherein k=1,2, . . . , K; performing a minimum value fusion process to the first error signal e0(t) and the second error signal ek(t) so as to obtain a residue signal e(t); and considering the residue signal e(t) as a final output of adaptive echo cancellation.