无限长单位脉冲响应(IIR)滤波器的设计：包括巴特沃兹带通滤波器，数字高通滤波器，巴特沃兹带通滤波器，-Infinite impulse response (IIR) filter design: including Butterworth band-pass filter, digital filter, Butterworth bandpass filter,

本程序可以实现地震滤波处理，采用的是巴特沃斯带通滤波器。-This procedure can be used to seismic wave filtering. Butterworth bandpass filter has been applied.