基于LabVIEW的数字滤波器的设计

论文编号:TX264  论文字数:22359,页数:53，

摘    要

 当前我们正处于数字化时代，数字信号处理技术受到了人们的广泛关注，其理论及算法随着计算机技术和微电子技术的进步得到了飞速的发展，被广泛应用于语音图象处理、数字通信、谱分析、模式识别、自动控制等领域。数字滤波器是数字信号处理中最重要的组成部分之一，几乎出现在所有的数字信号处理系统中。设计一个数字滤波器可以有助于我们更好的了解数字信号处理。
 本设计所采用的软件是美国NI公司推出的LabVIEW，LabVIEW是一种基于图形化编程语言的开发环境，具有十分强大的数据库。它为虚拟仪器设计者提供了一个便捷、轻松的设计环境，是目前应用最广泛的虚拟仪器开发平台软件之一。所以，本文选取LabVIEW作为设计数字滤波器的软件。
 数字滤波器是指有完成信号滤波处理的功能，用有限精度算法实现的离散时间线性非时变系统，其输入是一组(由模拟信号取样和量化的)数字量，其输出是经过变换的另一组数字量。相对于模拟滤波器，数字滤波器没有漂移，能够处理低频信号，频率响应特性可做成非常接近于理想的特性。另外其精度较高，容易集成等，这些特点决定了数字滤波器的应用越来越广泛。
关键词：数字信号处理；数字滤波器；虚拟仪器；LabVIEW

Design of Digital Filter Based on LabVIEW
ABSTRACT

 Nowadays we are in the digital time, the technology of digital signal process are paid extensive attention by people. With the development of technology of computer and microelectronics, the theory and arithmetic of digital signal process develop quickly, in some areas such as digital filters which extensively used in audio and video process, digital communications, frequency analysis, autocontrol and so on. Digital filter is one of the most important part of digital signal process, which almost appeared in all digital signal process system. Designing a digital filter could help us understand digital signal process more clearly.
 The software used in this paper is LabVIEW. LabVIEW is a kind of software based on graphic language, it has a very strong database. It provides a convenient and relaxed designing environment for the VI designer. It is one of the most widely used software. So this paper chooses LabVIEW as designing software.
 Digital filter is a discrete LIT system which can accomplish the signal filter using finite precision arithmetic, with a group of digital signal input (which are sampled and measured through analog signals) and another group of changed digital signal output. Digital filter is one of the important contents of digital signal process. Compared with analog filter, the digital filter hasn’t excursion, is able to process low frequency signal, the characteristic of frequency response is close to ideal value, with high precision, and easy to integrated. Digital filter will be more useful in the further.
Keywords: Digital Signal Process; Digital Filter; Virtual Instrument; LabVIEW

目    录

引    言 1
第1章 绪论 2
1.1课题研究背景 2
1.2课题研究意义 2
1.3本论文结构 3
第2章 虚拟仪器及LabVIEW 5
2.1引言 5
2.2虚拟仪器 5
 2.2.1虚拟仪器系统的构成 5
 2.2.2虚拟仪器的特点 5
 2.2.3虚拟仪器发展状况 6
2.3 LabVIEW简介 7
 2.3.1 LabVIEW发展概况 7
 2.3.2 LabVIEW开发环境 7
 2.3.3 VI程序设计 8
 2.3.4 LabVIEW程序设计结构 8
 2.3.5 LabVIEW程序运算形式 8
2.4本章小结 9
第3章 数字滤波器理论研究 10
3.1前言 10
3.2数字滤波器的定义和分类 10
3.3 IIR数字滤波器结构 10
3.4 FIR数字滤波器结构 14
3.5 IIR与FIR数字滤波器的比较 16
3.6本章小结 17
第4章 基于LabVIEW的数字滤波器的设计 18
4.1前言 18
4.2双通信号源的设计 18
 4.2.1正弦波发生器的设计 19
 4.2.2方波发生器的设计 19
 4.2.3三角波发生器的设计 20
 4.2.4均匀白噪声、脉冲函数和冲击函数发生器的设计 21
 4.2.5双通信号源的前面板设计 22
 4.2.6双通道信号源的程序设计 23
4.3数字滤波器的设计 24
 4.3.1巴特沃斯滤波器的设计 24
 4.3.2切比雪夫滤波器的设计 24
 4.3.3窗函数滤波器的设计 25
 4.3.4数字滤波器的前面板设计 26
 4.3.5数字滤波器的程序设计 27
4.4程序测试 28
4.5小结与心得体会 31
结论与展望 33
致谢 34
参考文献 35
附录A附图 36
附录B外文文献及译文 42
附录C主要参考文献题录及摘要 44

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