noisegen.m：生成白噪声并按照指定信噪比对语音进行加噪；

add_noisem.m：使用输入的噪音按照指定信噪比对语音进加噪；

SNR_singlech.m：输入纯净语音和加噪后的语音，计算其信噪比；

my_add_noise.m：调用上述函数进行加噪操作；-noisegen.m: white noise generated by the specified signal to noise ratio of the speech plus noise　add_noisem.m: use the specified input noise into the signal to noise ratio of the speech plus noise　SNR_singlech.m: pure voice input and processing after the noise voice, calculate the signal to noise ratio　my_add_noise.m: call the above functions plus noise operation