Acoustic Echo Cancellation Base On Small Microphone Array And Pc Simulation

Bluetooth hands-free communication device have more and more extensiveapplication in the people daily life, but the background noise and spatial acoustic echoare main problem in hands-free communication system, the adaptive speechenhancement and the adaptive acoustic echo cancellation become two important part inhands-free communication system, their main role is to reduce background interferencenoise signal and the space acoustic echo in order to improve the quality of voice incommunications,The adaptive speech enhancement and the adaptive acoustic echo cancellation havea wide application in the VOIP (voice over internet protocol), hands-free speakerphones,conference call, etc.In this thesis, the algorithm of stereo voice enhancement and mono acoustic echocancellation and some algorithms and methods for small microphone array based speechenhancement and noise cancellation have been analyzed.The first chapter is the introduction. First, describe the background andsignificance of this study. And describe the development and status of the adaptivespeech enhancement and the adaptive acoustic echo cancellation technology.Chapter2introduced the principle of adaptive speech enhancement, section IIIfocuses on the principles and algorithms of the adaptive speech enhancementmainstream technology, and using the MATLAB experimental simulation. Finally,analyze the effect of these types of adaptive speech enhancement.Chapter3first introduces the basic concepts of acoustic echo, then, analyzes themain principle of adaptive acoustic echo cancellation algorithm, include adaptiveacoustic echo cancellation, double talk detection, comfort noise addition and noisereduction. Finally, the use of MATLAB and C code simulation, the effect of theacoustic echo cancellation is investigated in detail and noise reductions are discussed.Chapter IV describes the adaptive acoustic echo cancellation software environmentand hardware environment, and test the effect of adaptive acoustic echo cancellationand noise elimination in car. Finally, the work of this paper is summarized and discussion about some possiblefuture research work is also presented.