说明：  进行语音信号的采集（*.wav）； 对语音信号进行频谱分析，画出采样后语音信号的时域波形和频谱图； 产生噪声信号并加到语音信号中，得到被污染的语音信号，并回放语音信号；对污染信号进行频谱分析，画出被污染的语音信号时域波形和频谱； 对语音信号进行滤波； 分析得到信号的频谱，画出滤波后信号的时域波形和频谱，并对滤波前后的信号进行对比，分析信号的变化；回放语音信号。
(Conduct voice signal acquisition (*. WAV); The frequency spectrum of the speech signal is analyzed, and the time domain waveform and frequency spectrum of the sampled speech signal are drawn; The noise signal is generated and added to the speech signal to get the polluted speech signal and play back the speech signal; the spectrum of the polluted speech signal is analyzed to draw the time-domain waveform and spectrum of the polluted speech signal; Filter the speech signal; Analyze the spectrum of the signal, draw the time-domain waveform and spectrum of the filtered signal, compare the signal before and after filtering, analyze the change of the signal, playback the voice signal.)