matlab中fir滤波器的设计,基于matlab的FIR滤波器设计毕业设计.doc

左手的ㄟ右手 2023-01-15 03:59 199阅读 0赞

ABSTRACT

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摘 要

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基于matlab的FIR滤波器设计

摘 要

本文分析了国内外数字滤波技术的应用现状与发展趋势，介绍了数字滤波器的基本结构，在分别讨论了IIR与FIR数字滤波器的设计方法的基础上，分析二者的优缺点并重点介绍了基于matlab的FIR(有限长冲激响应)数字滤波器的三种设计方法。本文采用窗函数法，频率采样法和最优等波纹线性相位法，通过调用Matlab函数设计FIR数字滤波器，并绘制对应的幅频特性曲线。最后，运用三种滤波器对噪声信号进行滤波处理，通过分析滤波前后信号频谱的变化，验证三种滤波器的效果。

关键词：数字滤波器，窗函数法，频率采样法，最优化设计法，幅频特性曲线，验证

目 录

ABSTRACT

This paper analyzes the present situation of the application of digital filtering technology at home and abroad and the development trend, introduces the basic structure of the digital filter, respectively in IIR and FIR digital filter design method is discussed, on the basis of analysis the advantages and disadvantages of both and introduced based on the matlab the FIR (finite impulse response) digital filter of the three design methods. Window function method in this paper, the frequency sampling method and optimization design method, by calling Matlab function to design FIR digital filter, and draw the corresponding amplitude-frequency characteristic curve. In the end, using three kinds of filter to filter the noise signal, through the analysis of the change of signal spectrum before and after filtering, the validation of three kinds of filter effect.

Key words: digital filter and window function method and frequency sampling method, the optimization design method, the amplitude-frequency characteristic curve, and validation.

目 录

TOC \\o "1-3" \\h \\z \\u HYPERLINK \\l "\_Toc356557064" 第1章 引 言 PAGEREF \_Toc356557064 \\h 1

HYPERLINK \\l "\_Toc356557065" 1.1滤波器的概念 PAGEREF \_Toc356557065 \\h 1

HYPERLINK \\l "\_Toc356557066" 1.2滤波器的发展过程 PAGEREF \_Toc356557066 \\h 1

HYPERLINK \\l "\_Toc356557067" 1.3滤波器的分类 PAGEREF \_Toc356557067 \\h 2

HYPERLINK \\l "\_Toc356557068" 1.4 数字滤波器的研究背景与意义 PAGEREF \_Toc356557068 \\h 3

HYPERLINK \\l "\_Toc356557069" 1.5 数字滤波器的现实运用及发展趋势 PAGEREF \_Toc356557069 \\h 4

HYPERLINK \\l "\_Toc356557070" 1.6 数字滤波器的简介 PAGEREF \_Toc356557070 \\h 6

HYPERLINK \\l "\_Toc356557071" 1.6.1