回声干扰抑制中的自适应信号处理算法研究

项目名称： 回声干扰抑制中的自适应信号处理算法研究

项目编号： No.61501119

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 刘畅

作者单位： 东莞理工学院

项目金额： 18万元

中文摘要： 本项目研究回声干扰抑制的自适应信号处理算法及其应用。主要研究内容包括：.①回声干扰抑制中的自适应仿射投影算法、子带算法、频域算法和凸组合算法的可变参数设计、理论分析以及计算机仿真实验。.②低复杂度的滤波器权系数部分更新算法和可变抽头长度算法的理论分析与仿真。.③基于两路滤波器模型双向通话检测算法的理论分析与仿真试验。根据不同的滤波器更新控制逻辑，比较各种两路更新算法的实际测试性能。.④搭建音频回声抵消的硬软件环境，对以上提出算法和方案的抑制性能进行测试。根据ITU一G.168测试标准，其最大回波延迟不超过1ms，各种测试条件下回波返回损失(Echo Eeturn Loss Enhancement,ERLE)均不低于6dB,结合理论结果和实际测试结果进一步分析算法的均方误差、均方偏差和硬件资源等性能指标。

中文关键词： 自适应信号处理；回声干扰抑制；可变设计参数；部分更新；双向通话检测

英文摘要： This project investigats several adaptive signal processing algorithms and their application for acoustic echo cancellation.The main contents include:.Firstly, the variable parameter design,theorical analysis and computer simulation experiments of the adaptive affine projection algorithm,adaptive subband algorithm,frequency-domain algorithm and convex combination algorithm for acoustic echo cancellation..Sceondly, the theoritical analysis and simulations of the lower-complexity coefficient partial-updating algorithm and variable tap-length algorithm..Thirdly, the double-talk detecting algorithm and simulations based on the two-path filter model for acoustic echo cancellation. According to different filter transfer logic, the actual testing results will be compared..At last,establishment of the hardware and software testing environments for acoustic echo cancellation, tests for the sevaral algorithms and schemes mentioned above.Acorrding to ITU一G.168 test standard, the maximal echo delay is no more than 1ms,the Echo Return loss Enhancement(ERLE) is no less than 6dB under all kinds of test conditons.Furthermore,analysis of the algorithm's performance indexes including mean-sqaure error,mean-sqaure deviation and hardware resources etc based on the combination of the theorical analysis and testing results.

英文关键词： adaptive signal processing;echo cancellation;variable design parameter;Partial updating;Double-talk detecting