武汉理工大学《信息群处理课程设计》报告
摘要............................................................................................................................................................I
ABSTRACT.............................................................................................................................................II
目录............................................................................................................................................................1
1 前言.........................................................................................................................................................3
2 原始语音信号采集与处理.....................................................................................................................4
2.1 语音信号的采样理论依据.............................................................................................................4
2.1.1
采样频率
..................................................................................................................................4
2.1.2
采样位数
..................................................................................................................................4
2.1.3
采样定理
..................................................................................................................................4
2.2 语音信号的采集..............................................................................................................................5
2.3 语音信号的时频分析......................................................................................................................5
2.4 语音信号加噪与频谱分析.............................................................................................................6
3 基于 LMS 自适应滤波器的设计...........................................................................................................8
3.1 基本 LMS 算法................................................................................................................................8
3.2 自适应噪声抵消原理...................................................................................................................12
3.3 基于最小均方误差准则(LMS)的自适应噪声抵消.....................................................................14
3.4 LMS 算法程序..............................................................................................................................15
4 滤波并比较滤波前后信号的波形及频谱...........................................................................................17
4.1 验证所设计的自适应滤波器........................................................................................................17
4.2 对主麦克风音频信号滤波............................................................................................................19
4.2.1
程序流程图
............................................................................................................................19
4.2.2 LMS
自适应滤波
....................................................................................................................20
4.3 调试分析........................................................................................................................................24
心得体会..................................................................................................................................................25
参考文献..................................................................................................................................................26
附录:源程序..........................................................................................................................................28
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