归一化LMS算法在IP电话回声消除的研究

Research of echo cancellation in VOIP on Normalized LMS algorithm

自适应滤波是IP回声消除的核心。该文针对声学回声消除的原理、基本算法以及实现过程中的一些关键问题进行了讨论与研究,并提出了适用于计算机软件实现的一种改进的LMS算法,即归一化LMS算法,通过实验结果证明它能够提高收敛性能,改善通话质量。

Adaptive filter is the key point of IP echo cancellation.This paper discussed and researched the principle of acoustic echo cancellation,the basic algorithm and implementation process of some of the key problems,then proposed an improved LMS algorithm which is apply to the computer software toimplement,namely NLMS algorithm,and through the experimental results proved that it can improve the convergence performance,ameliorate call quality.