基于Tms320c6713dsk的时频域自适应滤波声学回波消除

Gopalaiah, K. Suresh
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引用次数: 2

摘要

声回波消除是当今通信领域的一个典型问题。由声回波引起的输入语音信号干扰对用户双方都是干扰,并且会导致原始信号的质量下降。采用自适应滤波技术来减少不必要的回波,提高语音信号的质量。本文重点研究了以归一化最小均方(NLMS)和变步长最小均方(VSSLMS)为特征的各种自适应滤波算法,并在Tms320c6713dsk上实现了实时声学回波抵消。该混响消除器的主要模块是利用归一化最小均方(NLMS)计算、双通检测器(DTD)和非线性处理器(NLP)的通用通道框架。在DSP设备上实现了基于NLMS的通用框架的建立、基于变步长计算的改进NLMS和基于频域的快速LMS算法。该实现具有响应快、速度快、时间收敛性好、跟踪能力强等特点。不同自适应算法的计算必须用MATLAB进行分析。
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Acoustic Echo Cancellation using time and frequency domain adaptive filter methods on Tms320c6713dsk
Acoustic Echo Cancelation is a typical event in today's telecommunication fields. The input speech signal interference caused by acoustic echo is disturbing for both users side and causes a reduction in the quality of the original signal. The adaptive filtering techniques are used to reduce the unwanted echo, and increasing quality of the speech signal. This Paper focus on different Adaptive filters algorithms and characterized by the Normalized Least Mean Square (NLMS) and Variable Step Size Least Mean Square (VSSLMS) and also This Paper actualizes Real Time Acoustic Echo Cancellation on Tms320c6713dsk. The primary modules of this reverberation canceller are a versatile channel framework utilizing Normalized Least Mean Square (NLMS) calculation, a Double-Talk Detector (DTD) and a Non-Linear Processor (NLP). The Setup of NLMS based versatile framework, Modified NLMS with Variable Step Size calculations and Frequency Domain based Fast LMS algorithms are to be actualized on the DSP equipment. This implementation shows fast response, speed, convergence of time and good tracking capability. The calculation of different adaptive algorithms must be analysed utilizing MATLAB.
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