基于信号包络和互相关的双端通话检测算法研究  

Double-talk detection algorithm based on signal envelope and cross correlation

作　　者：张正文[1] 饶鼎 巩朋成[1] 涂斯纯 ZHANG Zhengwen;RAO Ding;GONG Pengcheng;TU Sichun(School of Electrical and Electronic Engineering,Hubei University of Technology,Wuhan 430068,China)

机构地区：[1]湖北工业大学电气与电子工程学院

出　　处：《现代电子技术》2020年第3期22-26,共5页Modern Electronics Technique

基　　金：湖北省自然科学基金（2018CFB545）;中国博士后科学基金（2016M600729）资助

摘　　要：声学回声消除(AEC)系统依赖于自适应滤波器的回声路径估计,当麦克风接收的信号存在回声和近端信号时,可能出现模拟回声路径的自适应滤波器发散,导致回声消除性能下降,严重时影响双端通话质量。一个成熟的声学回声消除器应该包含有双端通话检测算法,针对该问题,提出一种准确度高、性能稳定的基于信号包络检测(Env)和归一化互相关(NCC)估计相结合的双端通话检测(DTD)算法。该算法先使用远端信号与麦克风信号的能量包络来判断双端通话是否发生,当包络检测不能准确地判断双端通话时,再使用远端信号与麦克风信号的互相关估计对双端通话进行最终判断,保证双端通话检测的准确性。仿真实验表明,提出的算法可以准确判断双端通话的开始与结束,并且受回声路径变化的影响较小,提升了AEC系统的性能。The acoustic echo cancellation(AEC)system relies on the echo path estimation of the adaptive filter.When the signal received by microphone has echo and near⁃end signal,the adaptive filter divergence of the analog echo path may occur,resulting in degraded echo cancellation performance,which will affect the double⁃talk quality in severe cases.A mature acoustic echo canceller should be based on double⁃talk detection algorithm.In view of this,an accurate and stable double⁃talk detection(DTD)algorithm based on the combination of signal envelope detection(Env)and normalized cross correlation(NCC)estimation is proposed.In the algorithm,the energy envelope of the far⁃end signal and the microphone signal is used to judge whether the double⁃talk occurs or not.When the envelope detection fails to judge double⁃talk accurately,cross⁃correlation estimation of the far⁃end signal and the microphone signal is adopted to perform the final judgment of the double⁃talk to ensure its accuracy.The simulation experiments show that the proposed algorithm can accurately judge the beginning and end of double⁃talk,and is less affected by the change of echo path,which improves the performance of AEC system.

关 键 词：双端通话检测 声学回声消除 自适应滤波 回声路径估计 包络检测 互相关 

分 类 号：TN912.3-34[电子电信—通信与信息系统]