说明：  IIR数字滤波器的课件.此课件比较详细的说明了IIR滤波器的设计方法,从实际滤波器的基本概念到算法的推导和计算机辅助方法设计.
(IIR Digital Filter Software. This courseware more detailed explanation of the IIR filter design, from the filter algorithm to the basic concepts of derivation and computer-aided design.)