基于MATLAB的IIR滤波器设计与仿真毕业论文.doc

广西科技大学(筹)
毕业设计(论文)说明书
课题名称基于MATLAB的IIR滤波器设计与仿真


院别电气与信息工程学院
专业测控技术与仪器
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摘要
在现代通信系统中,由于信号中经常混有各种复杂成分,所以很多信号分析都是基于滤波器而进行的,而数字滤波器是通过数值运算实现滤波,具有处理精度高、稳定、灵活、不存在阻抗匹配问题,可以实现模拟滤波器无法实现的特殊滤波功能。数字滤波器根据其冲激响应函数的时域特性,可分为两种,即无限长冲激响应(IIR)数字滤波器和有限长冲激响应(FIR)数字滤波器。实现IIR滤波器的阶次较低,所用的存储单元较少,效率高,精度高,而且能够保留一些模拟滤波器的优良特性,因此应用很广。MATLAB 软件以矩阵运算为基础,把计算、可视化及程序设计有机融合到交互式工作环境中,并且为数字滤波的研究和应用提供了一个直观、高效、便捷的利器。尤其是MATLAB 中的信号处理工具箱使各个领域的研究人员可以直观方便地进行科学研究与工程应用。本文首先详细介绍了MATLAB 软件、数字滤波器和IIR数字滤波器设计的相关知识,接着重点介绍了用脉冲响应不变法设计IIR数字滤波器,用信号处理图形界面FDATool来设计滤波器以及Sptool界面设计的方法,用SIMULINK 仿真IIR滤波器。
关键字: IIR ; 滤波器; FDATool ; SIMULINK
ABSTRACT
In munication systems, due to the signal is often mixed with a variety position, so a lot of signal analysis are based on the filter, while the digital filter is filtering Through have processing of high precision, stable, flexible,impedance matching problem exists, you can achieve special filtering of analog filters can not be filter according to its impulse response function time domain features can be divided into two types, infinite impulse response (IIR) digital filter and finite impulse response (FIR) digital filter. The IIR filter order is lower , used less memory cell, high efficiency, high precision, but also to retain some of the good characteristics of the analog filter, it is widely software based on putation, the calculation, visualization and program design anic integration to interactive environment for digital filter, and the research and application of provides an intuitive, efficient and convenient tool. Especially in the Matlab signal processing to all areas of research toolbox personnel can easily for scientific research and engineering article detail introduces knowledge of the MATLAB software, digital filters and IIR digital filter design,Then highlight introduces the impulse response same method of IIR digital filter ,use Signal processing graphical interface