电话语音回声消除的研究

Research on Telephone Echo Cancellation

为了消除电话语音系统中的反射回声 ,本文通过对电话信道的研究 ,提出通过估算信道冲击响应 ,得到提示语音经过信道卷积后的结果 ,从而抑制回声的算法 .与LMS自适应算法相比 ,它可获得很好的回声抑制和对原始信号的保真效果 .回声抵消后 ,语音识别正确率和准确率分别提高约 2 9%和 6 0 % .

In order to cancel the reflecting echo of telephone speech interactive system,the telephone channel and line echo were studied.The channel impulse response is firstly estimated,and the convolution of channel impulse response and suggestive speech is calculated,which will be used to counteract the echo.The time delay between echo and primary signal is estimated and canceled using de convolution or Cross power Spectrum Phase method before the channel impulse response is estimated.This algorithm can get better echo canceling and primal speech fidelity than LMS adaptive filter.After Echo Cancellation,the speech recognition correction rate and accuracy rate are improved by about 29% and 60% respectively.