【作者】 张睿；

【导师】 殷福亮； 陈喆；

【作者基本信息】 大连理工大学 ， 电路与系统， 2009， 硕士

【摘要】 随着多媒体通信技术与语音信号处理技术的发展以及近些年人们对通信系统话音质量要求的提高,基于麦克风阵列的桌面电话会议系统和视频电话会议系统得到广泛应用,因此多路回波消除效果成为影响通信质量的关键。本论文主要针对立体声声学回波消除进行研究,并用Matlab仿真了立体声回波消除器。首先,简要介绍了回波产生的原理,回波消除器的工作原理和回波消除器的性能指标。其次,以较成熟的单路回波消除器为例,分析了单声道回波消除器的自适应模块典型算法。再次,研究了已有的立体声回波消除器的自适应算法,在此基础上阐述了已有立体声回波消除算法存在的问题(解的唯一性和解的失调问题),并列举了相应的解决办法。然后,主要讨论了立体声回波消除器其它模块相应算法。接下来,详细阐述了本文实现的立体声回波消除器各模块算法,并提出了预处理的改进方法。最后,将预处理的改进方法用程序加以仿真和验证,并经过主观测试,取得较好的回波消除效果。更多还原

【Abstract】 With the multi-media communication technology and speech signal processing technology development, as well as requirements increased on quality of voice communication systems in recent years, desktop telephone conferencing system and video-conferencing system have been widely used, so multi-channel echo cancellation effect become a key to communication quality.The paper aimed to research on stereo acoustic echo cancellation, and simulate result with the matlab.The first chapter briefly describes the principle of echo generation and echo cancellation. In the second chapter, this paper introduces the typical arithmetic of single-channel echo cancellation, such as LMS and RLS algorithm. The third chapter studies the existing stereo echo canceller adaptive algorithm, on this basis describe the problem of stereo echo cancellation algorithm (uniqueness of solution and misalignment), and then listed the solutions of problem. In the fourth chapter, the paper focuses on others module arithmetic of the stereo echo cancellation. The last two chapters elaborate the design of the stereo echo cancellation, bring forward improvement on preprocess, then simulate the method, and prove a better echo cancellation effect through nonlinear preprocess.更多还原