中文说明：用Matlab读取一个语音文件，文件格式是wave，对语音进行加噪，并对加噪后的语音进行小波软阈值降噪，输出降噪文件
English Description：
Using MATLAB to read a voice file, the file format is wave, add noise to the voice, and after adding noise to the voice wavelet soft threshold de-noising, output de-noising file