事件结构程序VI，使用labview实现-Program event structure VI, using labview to achieve

一款简单实用的labview 处理波形平均频谱的vi，其中20 是指波形峰值在平均值20 范围内的视为有效波形-A simple and practical LabVIEW processing waveform average spectrum of VI, where 20 means the wave peak value in the average range of 20 as effective waveform