具有双方对讲保护的自适应回波消除新算法

An new algorithm for acoustic echo cancellation with duplex talk protection

基于电话会议的声学回波中的双方对讲情况,本文提出了一个无需设置双方对讲检测器,但仍能在双讲过程中保护自适应滤波器消除性能的NLMS类算法.由于可以由远端信号和近端混合接收信号之间的相关性系数的变化来判断双讲发生或回波路径改变,所以改进的算法中直接将其代入滤波器权系数的迭代公式中,从而控制滤波器系数更新的快慢.仿真结果表明与同类算法相比,采用更小的计算量,该算法在双方对讲时能较好地起到保护作用,而在回波路径改变时也具有快速的跟踪性能.

The paper presents a new NLMS-like algorithm, which can protect the adaptive filter performance during duplex talk in acoustic echo cancellation of teleconference without setting a detector. Because the variety of the correlation of the far-end signal and near-end received signal can judge the duplex talk occurring or echo path changing, the correlation coefficient is directly used in the iteration formula to control the iteration speed of the filter. Simulation results indicates that the new algorithm has the good duplex talk protection performance and also has the fast tracking performance as the echo path changes but with less computational complexity contrast to the congener algorithm.