非线性回声消除之收敛性分析

Convergence Analysis of Nonlinear Echo Cancellation

回声一直是通信系统要面临的重要问题之一,随着信息行业的飞速发展,小型、低成本器件的使用导致非线性回声的产生。在传统的声学回声消除器中,往往假设回声路径是完全线性的,可采用线性滤波器进行模拟。然而,线性滤波器无法消除非线性回声,这严重影响了通信质量。目前已有一些非线性回波消除方法,但都缺少详细的收敛性分析。针对这一欠缺,在新提出一种非线性回声消除方法的基础上,进一步对滤波器系数做出较为详细的收敛性分析,并进行MATLAB仿真实验。仿真结果证实了所提出的非线性回波消除方法的有效性性以及其收敛性分析的正确性,对回声消除问题的相关研究具有重要的理论与现实意义。

Echo has always been one of the important problems faced by communication systems.With the rapid development of information industry,the use of small and low-cost devices leads to the generation of nonlinear echo.In the traditional acoustic echo canceller,it is often assumed that the echo path is completely linear and can be simulated by a linear filter.However,the linear filter cannot eliminate the nonlinear echo,which seriously affects the communication quality.At present,there are some non-linear echo cancellation methods,but they all lack detailed convergence analysis.In order to solve this problem,on the basis of a new nonlinear echo cancellation method,the filter coefficients are analyzed in detail and simulated by MATLAB.The simulation results verify the validity of the proposed nonlinear echo cancellation method and the correctness of its convergence analysis,which has important theoretical and practical significance for the relevant research on echo cancellation.