1、 基于Labview的信号时域与频域关系研究 The study of the relations between signals in time domain and frequency domain based Labview 学 生 姓 名 : 学 生 学 号 : 专 业 名 称 : 指 导 教 师 : 计算机与信息工程学院 2013 年 6 月 17 日 摘摘 要要 信号都具有两种不同的描述方式,一是可以在时间域用信号的波形来表示,二是在 频率域用信号的频谱图来表示。信号的时域和频域之间存在着密不可分的关系,通常用 数学公式及其平面图形来表示。但是,公式抽象且难以理解,而教科书上分散的
2、平面图 形也很难让人们对信号的时域与频域建立起一个形象直观的印象。 利用Labview建立更加简洁方便的虚拟示波仪,频谱分析仪等,产生原始信号并组成 了对信号的分析处理系统。首先是对原始信号进行时域波形显示,频域频谱显示。最后 再对滤波后的信号进行相关分析,除掉干扰信号,研究谐波叠加。 虚拟仪器是一种高效用于构建数据采集与监测系统图形化编程语言。 通过观察生动 形象的二维图形变化,色彩鲜艳,层次分明。动态地演示信号时域和频域特性曲线之间 的关系,使得原先抽象的数学公式与形象的物理图形联系起来。 关键词:关键词: Labview ;虚拟仪器 ;程序框图;谐波; ABSTRACT Signals
3、are described in two different ways; one is in the time domain waveform of a signal, the other one is in the frequency domain using a spectral graph. Signals in time domain and frequency domain closely related to each other, usually using mathematical formulas and shapes to represent it. However, th
4、e formula is always abstract and difficult to understand, and textbooks scattered plane figure is difficult for people to build an image of the visual impression on the signals in time domain and frequency domain. Using Labview to establish a more simple and convenient virtual oscilloscope, spectrum
5、 analyzer, it generates the original form of the signal analysis and processing system. The first step is to show original signal waveform in the time domain, and then the frequency domain. Finally, analysising the filtered signal correlation, removing the interference signal of the harmonic synthes
6、is. Virtual instruments are used to build an efficient data acquisition and monitoring system graphical programming language. By observing changes in vivid two-dimensional colorful, structured graphics, demonstrating dynamic signal in time domain and frequency domain. Characteristics of the relationship between the curves are used to link the original abstract mathematical formulas and graphic image of the physical. Key words:Labview ;Virtual Instrument;Block diagram;Harmonics; 目 录 第 1 章