说明：  数字滤波器是一种具有频率选择性的离散线性系统，在信号数字处理中有着 广泛的应用。数字滤波器的设计实际上是确定其系统函数H (z)并实现的过程。本文介绍了 用MATLAB设计、实现和分析HR数字滤波器的方法。
(digital filter is a kind of frequency selective discrete linear systems, the digital signal processing has wide application. Digital filter design is its system function H (z) and the achievement process. This paper presents the MATLAB design, implementation and analysis of HR digital filter method.)