摘 要..................................................................... I
Abstract................................................................... II
1绪论 ...................................................................... 1
2 语音信号的输入 ............................................................ 2
2.1 语音信号的采样相关原理 .............................................. 2
2.1.1 采样频率和采样位数 ............................................... 2
2.1.2 采样定理 ......................................................... 2
2.2 语音信号的采集 ....................................................... 3
2.3 语音信号的时频分析 ................................................... 3
2.4 语音信号加噪与频谱分析 .............................................. 5
3 基于 LMS 自适应滤波器的设计 ................................................ 7
3.1 LMS 算法 ............................................................. 7
3.2 自适应噪声抵消原理 ................................................. 11
3.3 基于最小均方误差准则(LMS)的自适应噪声抵消 ........................... 13
3.4 LMS 算法程序 ........................................................ 14
4 滤波前后信号的波形及频谱................................................. 16
4.1 验证所设计的自适应滤波器 ............................................ 16
4.2 对主麦克风音频信号滤波 .............................................. 20
4.2.1 程序流程图 ...................................................... 20
4.2.2 LMS 自适应滤波 .................................................. 21
4.3 调试分析 ............................................................ 26
心得体会................................................................... 27
参考文献................................................................... 28
附录....................................................................... 29
