绘制声音波形，可用于声音波形曲线的实时绘制。-Mapping sound waves, it can be used for real-time sound waves rendering curve.

Matlab下直接调用NI采集卡，实时绘制波形并重现声音的例程(A routine that invokes a NI acquisition card directly under Matlab, rendering the waveform in real time and reproducing the sound)