说明：  此代码为音频信号格式为wav的音频文件的入门级介绍，介绍怎样将头文件格式写入另一个文件进行处理，并讲述怎样处理剩下的音频数据。
(This code for the audio signal format wav audio file' s entry-level introduction, describes how to write the header file to another file format for processing, and tells how to deal with the rest of the audio data.)