此源码可以产生8K、16K的8位、16位，的DTMF音频信号，并且保存成wave文件，并支持实时播放，是学习DTMF通讯的好资料-This source can produce 8K, 16K of 8, 16, a DTMF audio signal, and saved as wave files, and support for real-time playback, is to learn to communicate better DTMF information