说明：  包括单边带、双边带、载波抑制及四倍频,是信号处理的基础，FIR 底通和带通滤波器和IIR 底通和带通滤波器。
( Including single sideband, double sideband, suppressed carrier and quadruple, Is the basis of the signal processing, Bottom-pass and band-pass FIR and IIR filter bottom pass and band-pass filter.)