该Labview程序可设置Butterworth滤波器的滤波器类型、最高截止频率、最低截止频率和滤波阶数，通过滤波前后两个示波器窗口波形的对比，可很直观地观察到整体滤波的效果。-Butterworth filter can be set filter type, the highest cut-off frequency, the lowest cut-off frequency and filter order, by comparing the two windows oscilloscop