毕业论文基于Labview的FIR数字滤波器的设计.doc

摘 要 数字滤波器分为无限脉冲响应数字滤波器(IIR)和有限脉冲响应数字滤波器(FIR)，FIR数字滤波器在语音、图像、数字通信系统和计算机领域信号处理中有着广泛的应用。论文主要研究在环境中实现FIR数字滤波器的设计。 论文重点描述了FIR数字滤波器的原理、方法、设计过程及窗函数法、频率取样法、切比雪夫逼近法等几种常用的设计方法。分别采用窗函数法频率取样法、切比雪夫逼近法FIR数字滤波器，通过对几种设计方法的比较，得出了各自的优缺点。最后对在窗函数法下设计的FIR数字滤波器进行了仿真，得出了正确的仿真图形。 ? 通过对实验的分析，说明论文在几种方法下有效地实现了FIR数字滤波器的设计，所设计的FIR数字滤波器能有效地对含噪信号进行滤波处理。Abstract Digital filter are divided into infinity impulse response digital filter (IIR) and finite impulse response digital filter (FIR), FIR digital filters in phonetics, image, digital communication system and in the field of computer signal processing in a wide range of applications. Thesis mainly realize Labview environment in the design of FIR digital filters. The paper describes the principle of FIR digital filters, methods, design process and window function method, frequency sampling method, chebyshev approximation method of several common design method. The author window function method were used in several different window function including rectangular window, han ning window, Kaiser window, Blake mann window and frequency sampling method, chebyshev approximation method realizes the FIR digital filters and the conclusion that various methods of FIR digital filters the frequency response of graph, through the comparison of several design method, it is concluded that the respective advantages and disadvantages. Finally in window function method to design of FIR digital filters under simulated, obtained the correct the simulation. Through the analysis of experiment in that paper, several methods efficiently implemented under the design of FIR digital filters, the design of FIR digital filters can effectively to signal with noise filtering processing. Keywords: FIR digital filters; Labview; window function method; frequency sampling method ; corrugated chebyshev approximation method 目 录 第1章 绪 论 1 1.1研究意义 1 1.2 研究现状及内容 1 1.3 本文章节安排 2 第2章 虚拟仪器介绍 3 2.1虚拟仪器的介绍及发展现状 3 2.2 Labview简介 4 2.3使用 LabVIEW程序设计滤波器的优点 4 2.4 小结 4 第3章