The Audio File Library provides a uniform programming interface to standard digital audio file formats. This library allows the processing of audio data to and from audio files of many common formats (currently AIFF, AIFF-C, WAVE, NeXT/Sun

数据处理中经常使用归一化方法，该算法是最基础和常用的面归一化方法(CSN).-Normalization method is often used in data processing, the normalization method (CSN) algorithm is the most basic and commonly used surface.

短时傅里叶变换，可以对采集的数据处理，读出信号包络-Short-time Fourier transform, processing the collected data can be read out of the signal envelope