毕业设计论文-基于Matlab的FIR低通滤波器设计.docVIP

浙江万里学院 本科毕业设计(论文) (2012届) 论文题目 基于Matlab的FIR低通滤波器设计 (英文) Design of FIR Low-pass Digital Filter Based on Matlab 所在学院 电子信息学院 专业班级 学生姓名 指导教师 指导教师 职称 完成日期 年 月 日 基于Matlab的FIR低通滤波器设计 黄丽王 （浙江万里学院电信学院电子082班） 2012年4月 摘 要 FIR数字滤波器是数字的一个重要组成部分，由于FIR数字滤波器具有严格的线性相位，因此在信息的采集和处理过程中得到了广泛的应用。本文介绍了FIR数字滤波器的概念窗函数法、频率采样法和等波纹逼近法FIR滤波器的窗函数法、频率采样法和等波纹逼近法FIR滤波器等波纹逼近法。关键词：FIR数字滤波器；窗函数；频率采样；等波纹逼近法；Matlab Abstract a digital signal, there will be some interference signal which system does not needed often. So we need to use digital filtert to filter the signal to extract the useful signal. FIR digital filter is an important component of digital filter.As the FIR digital filter’s linear phase response is required, it have been widely used in information collection and processing. This paper introduced the concept of FIR digital filters and the general idea of the design, Introducting and compareding the advantages and disadvantages of three kinds of the FIR filter design method, and respectively design filter using the window function method, the frequency sampling method and wave approximation method. Especially in digital signal processing, Matlab is widly used which can design requirements It is Intuitive and simple so that greatly reduce the workload. This article is designed by Matlab function and simulated by Matlab software to make the tedious step in the calculation simplify.It also drawed the amplitude-frequency characteristic curve relatly. Finally, the original signal and filtered signal are contrasted and analied. Key Words:FIR digital filters，Window function，Frequency sampling，Equiripple approximation method，Matlab 目 录 1　引言 1 2　FIR数字滤波器线性相位条件 2 2.1 FIR数字滤波器概述 2 2.2 FIR数字滤波器线性相位定义 3 2.3 FIR数字滤波器线性相位时域约束条件 3 3　FIR数字滤波器设计方法 5 3.1 FIR数字滤波器的窗函数设计法 5 3.1.1 窗函数设计法的设计思路 5 3.1.2 吉布斯效应 7 3.1.3 常见窗函数介绍 7 3.2 FIR数字滤波器的频率采样设计法 10 3.2.1 频率采样法的基本思路 10 3.2.2 频率采样法的设计步骤 11 3.3 FIR数字滤波