基于MATLAB的FIR数字滤波器设计

文档编号:JD280       文档字数:11261,页数:32

摘  要
数字滤波器是由数字乘法器、加法器和延时单元组成的一种装置。其功能是对输入离散信号的数字代码进行运算处理，以达到改变信号频谱的目的。由于电子计算机技术和大规模集成电路的发展，数字滤波器已可用计算机软件实现，也可用大规模集成数字硬件实时实现。本文针对在实际设计中要大量应用数字滤波器这一现实，对数字滤波器的基本理论、性能特点、设计方法进行了全面的分析，特别是对有限冲击响应数字滤波器(FIR)的设计进行了深入的探讨。介绍了滤波器的定义、分类、滤波器的设计和实现方法。在设计方法中介绍了数字滤波器设计的基本步骤和MATLAB设计。主要研究了FIR数字滤波器的设计原理及常用的三种设计方法:窗函数法、频率抽样法、切比雪夫逼近法，并通过具体实例进行仿真分析。
关键词:滤波器设计；纹波；过渡带

ABSTRACT
Digital wave filter is a kind of installation that forms by digital multiplier, adder and the unit of delay time. Its function is to carry out operational handling for inputting the digital code of dispersed signal in order to reach the purpose that changes signal frequency spectra. Because of the development of the computer technical circuit of large scale integration digital wave filter can already realize with computer software, can also realize with the digital hardware real time of large scale integration. Digital wave filter is a dispersed time system. As digital filters, in particular FIR filters, are widely used in modern designs, this dissertation comprehensively anglicized fir’s basic theory, characters and design methodologies. It is introduce the digital filter’s definition, classification and the designed method of the filter. The designed method of the digital filter introduced the basic step and designed with the MATLAB. In the thesis, the design theory and three usual design ways of FIR digital filter are studied. They are window functions; frequency sampling technique and chebyshev equal ripple approach designs. Analyze experimental results by some material examples.
Keywords:  Design of Digital Filter; Contradiction of Ripple; Transition Band

目  录
摘  要 I
ABSTRACT II
1  引　言 1
2  数字滤波器简介 2
3  数字滤波器设计方法 5
3.1  数字滤波器设计的基本步骤 5
3.2  滤波器的MATLAB设计 6
4  FIR数字滤波器的MATLAB设计 8
4.1  窗函数设计FIR滤波器 8
4.2  频率取样法设计FIR滤波器 14
4.3  切比雪夫逼近法设计FIR滤波器 20
5  结  论 27
谢  辞 28
参考文献 29

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