声回声抵消系统中后处理滤波器的研究

Efficient Post-processing Filter for Acoustic Echo Cancelation System

提出一种回声抵消系统中残留回声的抑制方法,利用回声信号的估计值和包含残留回声的输出误差信号计算得到的后处理滤波器,将残留回声进一步消除。提出的后处理滤波器可以有效地与频域自适应算法融合,并非常适用于多通道处理。实验和仿真结果均证明了该后处理滤波器的有效性。

In this paper, a method to reduce the residual echo in an acoustic echo cancellation system is proposed. Residual echo can be reduced effectively with a post -filter, which is calculated with the error signal and the output signal of the adap- tive filter. The proposed post - filters can be seamlessly combined with the frequency - domain adaptive filter. They also can be easily extended to multi - channel processing. The instrumental evaluation and listening test both demonstrate the superiority of the post - filters.