毕业设计（论文）-基于MATLAB的数字滤波器的设计.doc

XXXX大学
本科毕业设计(论文)
题目基于MATLAB的数字滤波器的设计
学院 XXXXXXXXXXX学院
专业班级 XXXXXXXXXXXXXXXX
姓名 XXXX
摘要
数字滤波在通信、图像编码、语音编码、雷达等许多领域中有着十分广泛的应用。目前,数字信号滤波器的设计图像处理、数据压缩等方面的应用取得了令人瞩目的进展和成就。近年来迅速发展起来的的小波理论,由于其局部分析性能的优异在图像处理中的应用研究,尤其是在图像压缩、图像去噪等方面的应用研究,受到了越来越多的关注。
本文分析了国内外数字滤波技术的应用现状与发展趋势,简述了模拟滤波器和数字滤波器的设计原理的区别,介绍了IIR数字滤波器和FIR数字滤波器的设计方法,并对两种设计方法进行了简单的分析比较。MATLAB因其强大的数据处理功能被广泛应用于工程计算,其丰富的工具箱为工程计算提供了便利,利用MATLAB信号处理工具箱可以快速有效地设计各种数字滤波器,设计简单方便。本文正是利用MBTLAB设计了数字滤波器,可以按照设计要求非常方便地调整设计参数,极大地减轻了设计的工作量,有利于滤波器设计的最优化。文中IIR数字滤波器采用巴特沃思设计,FIR数字滤波器采用布莱克曼窗函数和凯泽窗函数进行设计,得出了与之相对应的幅度响应曲线和相位响应曲线,并对两者进行了简单的比较。
凯泽窗设计的滤波器实际通带带宽比布莱克曼窗设计的窄,截止频率下降斜率布莱克曼窗较大。文中对所设计的数字滤波器进行了仿真分析,得出了所要求的滤波图像。
关键词:滤波器;MATLAB;IIR;FIR
Abstract
Digital filtering munications, image coding, speech coding, radar and many other fields has a very wide range of , the design of digital signal filter image processing, pression and other applications has made remarkable progress and developed in recent years, wavelet theory, local analysis because of its excellent performance in the application of image processing, especially in pression, image denoising and other aspects of applied research, has been more and more attention.
This paper analyzes the domestic and international digital filter technology status and development trend, outlined analog filters and digital filter design principle of distinction, introduced the IIR digital filter and FIR digital filter design methods, and twoA simple design method of analysis parison. MATLAB because of its powerful data processing functions are widely used in engineering calculations, and its rich toolbox for the engineering calculation provides a convenient, the use of MATLAB Signal Processing Toolbox can quickly and efficiently design a variety of digital filters, design easy and convenient. This article is designed using MBTLAB digital filter, in accordance with design requirements are very easy to adjust the design parameters, greatly reducing the