包括各种频域滤波器：经典频域理想低通滤波器 ，经典频域巴特沃斯低通滤波器 ，经典频域指数低通滤波器， 经典频域理想高通滤波器 ， 经典频域巴特沃斯高通滤波器， 经典频域指数高通滤波器,经典频域带通滤波器 ,经典频域带阻滤波器-Including a variety of frequency domain filter: Classic ideal low-pass filter frequency domain, frequency domain classic Butterworth low-pass filter, the classic low-pass filter frequency domain index, the classic ideal high-pass filter frequency domain, frequency domain Butterworth classic Andean high-pass filter, the classic high-pass filter frequency domain index, the classical frequency domain band-pass filter, band stop filter frequency domain classics