利用声卡实现: 1)一个简单的信号发生器 2)可以监视2路输入-use Sound Card : 1) a simple signal generator 2) can monitor the importation of two roads

通过调用waveopen 函数获取pcm格式的声音文件的声道波形及其动量音量显示-Waveopen by calling the function to get the pcm format sound files and their momentum volume channel waveform display