说明：  基于PC声卡的双通道示波器设计（LabVIEW实现），从音频接口输入，带宽20k ，希望后来者使用其他接口如USB实现，提高带宽
(PC sound card based dual-channel oscilloscope design (LabVIEW implementation), from the audio interface input bandwidth of 20k, then those who want to use other interfaces such as USB implementation, increase the bandwidth)