变速率更新自适应算法在回声抵消中的应用  

Multi-rate Updated Adaptive Algorithm Applied to Acoustic Echo Cancellation

作　　者：董航[1] 孙洪[1] 

机构地区：[1]武汉大学电子信息学院信号处理实验室,武汉430079

出　　处：《自动化学报》2008年第9期1184-1187,共4页Acta Automatica Sinica

基　　金：国家自然科学基金(60372057)资助~~

摘　　要：通过对回声抵消的实际应用环境进行分析,本文提出一种动态改变滤波器权系数更新速率的算法.该算法在权系数的更新速率与误差信号之间建立一种非线性函数关系,具有在环境突变阶段,滤波器系数的更新速率自动变快,而在稳态阶段更新速率很慢的特点,可以极大地降低自适应滤波器算法的运算量.理论分析和计算机仿真结果表明该算法具有良好的收敛性能和跟踪性能,稳态误差的水平与传统算法保持一致。By analysing the actual room acoustic environment, this paper presents a novel algorithm for acoustic echo cancellation, which can dynamically change the coefficients updaterate of the adaptive filter. This algorithm builds up a nonlinear function relationship between update-rate and the error signal. The update-rate of the coefficients increases automatically when the environment varies, while it would be smaller in a stable state, which can lead to significant reduction in the computational burden. Theoretical analysis and computer simulations indicate that the convergence and tracking properties of this algorithm are as good as the traditional algorithms.

关 键 词：自适应滤波器 回声抵消 变速率 运算量 

分 类 号：TN912.3[电子电信—通信与信息系统]