Matlab7.1环境下IIR滤波器的设计与仿真

Design and Simulation of IIR Digital Filter in Matlab7.1

在Matlab7.1环境下IIR数字滤波器的设计有三种方法,典型设计法,完全设计法,FDATOOL设计法。由于典型设计法与完全设计法具有复杂的设计过程、大量的计算工作、调整滤波器的特性困难的特点,限制了这两种方法的应用。该文重点介绍第三种快速有效的设计数字滤波器的方法——FDATOOL设计法。并详细说明了运用Matlab语言进行完全设计法和利用FDATOOL进行IIR数字滤波器界面设计的步骤。FDATOOL界面设计法试我们可以直观简便的随时对比设计要求和调整滤波器特性参数,对于减轻设计工作量和最优化滤波器设计起到极大的作用。同时还说明了在Matlab环境下如何利用simulink对所设计的IIR数字滤波器仿真。

There are three methods in IIR digital filter design in the Matlab7.1 environment：the typical design method,the direct design method and design method of FDATOOL.The former two traditional digital filter design method are complex,time-con suming and the filter characteristic adjustment is difficulty.These has affected its application.This paper introduces the design method of FDATOOL.Interface design detailed steps were given by the use of Matlab language program design and FDATOOL tools signal processing toolbox.It can adjusting the parameters with the design requirements and characteristics of the filterat any time in the processing.It is simple,intuitive and greatly reduce the workload.This paper also introduces how to use the SIMU LINK to simulate the designed filter.