在MATLAB环境下IIR数字滤波器和FIR数字滤波器的设计方法及实现方法，并进行图形用户界面设计，显示所介绍滤波器的特性。-designs of the Infinite Impulse Response digital filter (IIR) and Finite Impulse Response digital filter (FIR) under MATLAB are studied. And the Graphical User Interfaces (GUI) to analysi