读入需要的语音文件（wav格式），进行频谱分析，对其加入随机噪声，然后进行降噪处理，降噪处理前后效果较佳-Need to read the audio files (wav format), spectral analysis, it added random noise, then noise reduction, noise reduction before and after treatment was better

一个MATLAB例程，模拟高斯白噪声通过带通滤波器，生成一个窄带随机过程。(In a MATLAB routine, the Gauss white noise is simulated by a bandpass filter to generate a narrow band random process.)