IIR数字滤波器的MATLAB实现.doc

IIR数字滤波器的MATLAB实现
摘要文中首先对数字滤波器作了简要的叙述。介绍了数字滤波器的分类情况,并对其工作原理进行了简要描述,指出了数字滤波器设计中应该满足的一定的技术指标。然后文中对IIR数字滤波器的设计基础作了一定的介绍。讨论了用脉冲响应不变法和双线性变换法设计IIR数字滤波器的原理及优缺点。然后又介绍了用双线性变换法设计IIR数字滤波器的具体步骤。接着简要介绍了MATLAB语言、MATLAB工具箱函数以及用MATLAB语言设计巴特沃斯模拟低通滤波器的设计方法。最后重点介绍用MATLAB工具箱函数设计IIR数字滤波器。文中采用的设计方法是双线性变换法结合MATLAB工具箱函数设计出相应IIR数字滤波器,运行出幅频和相频特性图。
关键词 MATLAB;双线性变换法;幅频相频特性图
IIR digital filter's MATLAB design

Zhang Cai
School of Physics and Electronic Information, Huaibei Normal University , 235000
Abstract In this paper it first give a brief description of a digital filter. It describes the classification of digital filters, and briefly describes its working principle, pointing out that the digital filter design should meet a certain degree of technical indicators. Then in the text it describes the basis of the IIR digital filter design . Discussed the principle of designs the IIR digit filter, and the good and bad points with the pulse response not political reform and the bilinearity method of transformation. Then also introduced designs the IIR digit filter's concrete step with the bilinearity method of transformation. Then briefly introduced the MATLAB language, the MATLAB toolbox function as well as uses MATLAB the language design Bahtwass simulation low pass filter's design method. Finally introduced with emphasis designs the IIR digit filter with the MATLAB toolbox function . In the article uses the design method is the bilinearity transformation bined with the MATLAB toolbox function to design the corresponding IIR digit filter, running out of amplitude frequency and phase frequency characteristics graph.
Keywords MATLAB; Bilinearity method of transformation; amplitude frequency and phase frequency characteristics graph.
目次
引言 1
1 数字滤波器 2
数字滤波器的分类 2
数字滤波器的工作原理 3
数字滤波器的设计指标 3
2 IIR数字滤波器的设计方法 5
5
: 7
8
10
3 MATLAB语言简介 12
MATLAB工具箱函数 12
MATLAB功能和特点 13
4 IIR数字滤波器 14