基于动量梯度下降的回声消除算法  

Echo cancellation algorithm based on momentum gradient descent

作　　者：陈张良 卢敏[1] 曾桂根[1,2] CHEN Zhangliang;LU Min;ZENG Guigen(School of Communications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;National Engineering Research Center for Communication and Network Technology,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003 [2]南京邮电大学通信与网络技术国家工程研究中心,江苏南京210003

出　　处：《现代电子技术》2024年第9期71-77,共7页Modern Electronics Technique

摘　　要：针对极端环境话音系统下声学回波影响工作人员正常施工,且常规声学回声消除算法收敛速度慢的问题,提出一种基于动量梯度下降的基于l0范数的改进系数成比例归一化最小均方误差算法(L0⁃IPNLMS)。该算法将动量因子引入L0⁃IPNLMS算法中,解决在算法运行过程中梯度下降时梯度摆动幅度可能过大的问题,也提高了自适应滤波器的收敛速度,且残余回声下降明显,声学回波抑制效果更好。仿真实验表明,与L0⁃IPNLMS算法相比,新算法在模拟随机多音信号与真实语音信号输入时,均方误差(MSE)可以降低3.47 dB和3.69 dB,回波抑制比(ERLE)提高了3.46 dB和3.68 dB,在低信噪比情况下,使用新算法对真实语音信号进行回声消除,收敛速度高于L0⁃IPNLMS等算法,且收敛效果有明显改进。An improved proportional normalized least⁃mean⁃square algorithm based on the l0 norm(L0⁃IPNLMS)based on momentum gradient descent is proposed to address the issue of acoustic echoes affecting normal work in extreme environment speech systems and the slow convergence speed of conventional acoustic echo cancellation algorithms.In the algorithm,the momentum factor is introduced into the L0⁃IPNLMS algorithm to eliminate obvious gradient oscillation amplitude during algorithm operation,and improve the convergence speed of adaptive filters.In addition,the residual echo decreases significantly,which results in better acoustic echo suppression effect.Simulation experiments show that,in comparison with the L0⁃IPNLMS algorithm,the improved algorithm can reduce the mean⁃square error(MSE)by 3.47 dB and 3.69 dB and increase the echo return loss enhancement(ERLE)by 3.46 dB and 3.68 dB when simulating random multi⁃tone signals and real speech signal inputs.In low signal⁃to⁃noise ratio(SNR),the rate of convergence of the improved algorithm is higher than that of algorithms such as L0⁃IPNLMS,and its convergence effect is significantly improved when it is used for echo cancellation of real speech signals.

关 键 词：回声消除算法 动量梯度下降 极端环境话音通信系统 归一化 最小均方算法 收敛速度 

分 类 号：TN912.3-34[电子电信—通信与信息系统]