把指定的噪声叠加到信号上去.有标准噪声库NOISEX-92，其中带有白噪声、办公室噪声、工厂噪声、汽车噪声、坦克噪声等等，在信号处理中往往需要把库中的噪声叠加到信号中去，而噪声的采样频率与纯信号的采样频率往往不一致，需要采样频率的校准。 -The specified noise superimposed to the signal up. Standard noise library NOISEX-92, with white noise, office noise, factory noi

标准NOISEX-92噪声库，对于声音信号分析的人有用。-Standard noise NOISEX-92 library, the human voice signal analysis for useful.

各个语音研究中，几个比较有代表性的噪声，从而便与研究语音降噪性能。(n each speech research, several representative noises can be used to study the performance of speech noise reduction.)