一种适用于双讲情况的回声消除结构

A New Improved Echo Cancellation Structure

双端通话情况下自适应回声消除的性能发生恶化,甚至可能导致自适应滤波器发散,严重地影响免提通话的质量。因此必须在回声消除系统中使用双话检测(Double Talk Detection,DTD)来控制自适应滤波器系数的更新。针对这一问题,本文采用了一种改进的回声消除结构,在该结构中采用的双端检测算法和非线性处理模块有效提高了双话情况下回声消除系统的性能。

In the case of two terminal call,the performance of adaptive echo cancellation deteriorates,and may even lead to the divergence of adaptive filter,which seriously affects the quality of hands-free call.Therefore,in the echo cancellation system,double talk detection(DTD)must be used to control the update of adaptive filter coefficients.To solve this problem,a new im⁃proved echo cancellation structure is proposed in this paper.In this structure,the double ended detection algorithm and nonlinear processing module are applied to effectively improve the performance of echo cancellation system in the case of two calls.