基于MATLAB的数字滤波器的设计与仿真毕业论文.docVIP

PAGE 1 1 毕业论文 基于MATLAB的数字滤波器的设计与仿真 摘 要 数字滤波器是数字信号处理中的重要组成部分之一，在许多科学技术领域中广泛使用滤波器对信号进行处理。它是一个离散时间系统，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。该设计过程较复杂牵涉到模型逼近,指标选择，计算机仿真性能分析及可行性分析等一系列的工作，本文从设计原理以及数学软件MATLAB出发阐述数字滤波器的设计原理与方法。 应用MATLAB语言设计数字滤波器时采用直接程序设计法、FDATool的设计方法。通过实例给出了FIR程序设计法的仿真图形，并在MATLAB的Simulink环境下，调用所设计的FDATool滤波器进行了仿真。 关键词：MATLAB；数字滤波器；FDATool；Simulink；FIR ABSTRACT The digital filter is one of the most significant applications of DSP. In many fields of science and technology, it is widely used for signal processing. Digital filter is a discrete time system. Its function is to carry out the digital code of the input dispersed signal so as to change signal frequency spectrum.The design process is very complex involving the model approximation, parameter selection, computer simulation and performance analysis, feasibility analysis and a series of work. This article try to solve the hard problem in another way, making the benefit of the advanced software MATLAB and gives some basic MATLAB advice to readers to help them to learn the information of using MATLAB as a tool to design different kinds of digital filters. The design methods of direct programming and FDATool interface are introduced in designing digital filter with MATLAB in this article. Through the examples, gives the FIR program design method of simulation graphics .Further more, the designed FDA tool filter a re called and simulated in SIMULINK. Key words: MATLAB; Digital filter; FDATool; Simulink; FIR 目 录 TOC \o 1-3 \h \u HYPERLINK \l _Toc17693 绪论 l _Toc31222 1 数字滤波器概述 l _Toc14638 1.1 数字滤波器的基本概念及分类. l _Toc31916 1.2 数字滤波器的设计原理 l _Toc8051 1.2.1 IIR数字滤波器的设计方法 l _Toc23878 1.2.2 FIR数字滤波器的设计方法 l _Toc10118 1.3 IIR滤波器与FIR滤波器的分析比较 l _Toc6925 1.4 数字滤波器的应用 l _Toc29013 1.5 本章小结 l _Toc9429 2 MATLAB的简介 l _Toc19581 2.1 MATLAB的概况 l _Toc8057 2.2 MATLAB的功能 l _Toc22363 3 基于MATLAB的FIR滤波器的实现 l _Toc12583 3.1 程序设计法 l _Toc9112 3.2 滤波器分析设计工具箱FDATool法 l _Toc51 3.2.1 FDATool