阐述回声消除技术原理,介绍自适应回声消除器基本结构,分析两类消除回声的基本算法,并提出基于两类算法的几种改进型算法,为提高IP电话的话音质量提供一定的参考。-　The element of the echo cancellation and the configuration of the adaptive echo canceller is first in troduced in this paper. It also analyzed two kinds of basical go ri

回声消除系统使用自适应滤波器模拟回声信道，自适应滤波器的阶数对回声消除效果具有重要的影响，合适的阶数可以提高回声消除效果。通过回声消除仿真对比实验显示，本算法的滤波器失准系数低于 NLMS、PNLMS 算法。-The echo cancellation system uses an adaptive filter to simulate the echo channel. The order of the adaptive filter has an important effect on th