IP语音通话中回声消除算法的研究  

Research on echo cancellation algorithm for IP voice call

作　　者：魏臻[1] 凌勇[1] 程磊[1] 程运安[1] 

机构地区：[1]合肥工业大学计算机与信息学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2011年第5期687-690,共4页Journal of Hefei University of Technology：Natural Science

基　　金：高等学校博士学科点专项科研基金资助项目(2009JYBS0519)

摘　　要：文章首先介绍了IP电话系统中回声的特点以及声学回声消除的原理,并针对IP语音通信中回声的特点,介绍了用于处理这种回声的LMS牛顿算法,但其存在步长因子选择较难、收敛性能不高等缺点。该文在LMS牛顿算法的基础上,提出了一种改进的LMS牛顿算法,并对该算法的基本原理进行了分析说明。计算机仿真结果表明了该算法的可行性和优越性,经对比分析可知,新算法收敛性能良好,尤其是对大步长因子,明显优于LMS牛顿算法,克服了LMS牛顿算法存在的一些不足,具备更好的回声消除功能。In this paper,the features of echo and principle of acoustic echo cancellation in IP system are introduced,and in view of the characteristics of echo in IP voice communications,the LMS Newton algorithm for dealing with this echo is presented.But this algorithm has difficulty in selecting step-factor and its convergence is low.So based on the LMS Newton algorithm,a modified LMS Newton algorithm is proposed in the paper,and its basic principle is analyzed.Computer simulation results show the feasibility and superiority of the new algorithm,and the comparative analysis shows that the new algorithm has good convergence and is much better than the LMS Newton algorithm,especially for the large step-factor.It overcomes some drawbacks of the LMS Newton algorithm and achieves better effects in echo cancellation.

关 键 词：回声消除 LMS牛顿算法 自适应滤波 语音通信 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]