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华北电力大学本科毕业设计（论文）1毕业设计(论文)`院系自动化系专业班级测控技术与仪器1201班学生姓名加桑扎西指导教师白康题目基于LABVIEW的IIR数字滤波器设计二○一六年六月华北电力大学本科毕业设计（论文）I基于LabVIEW的IIR数字滤波器设计摘要关于基于LabVIEW的滤波器的背景和现状，然后对数字滤波器的定义、分类、性能指标等相关内容进行了详述。接着列举了一些数字滤波器中IIR数字滤波器的特点及常见的设计方法，例如模拟滤波器，通过对低通滤波器进行模拟频率变换得到。补充了一些去噪的知识。本文重点内容是关于虚拟仪器LabVIEW软件介绍，通过了解该软件相较于传统仪器设计优缺点，然后自学该软件，熟悉该软件功能、操作，为完成课题目标（设计IIR数字滤波器，实现滤波器简单的功能）做好准备工作。最后是本文关于在LabVIEW平台上的设计工作的说明，采用了现有的IIR型滤波器，如巴特沃斯滤波器、切比雪夫滤波器等进行滤波功能设计。主要设计了三个模块，分别是信号生成模块、滤波器模块、频谱分析模块。信号发生器是一个生成正弦波形带有均匀白噪声的仿真信号。通过低通IIR滤波，滤除噪声。然后还对滤波后的信号进行了频谱（幅值）分析。设计IIR数字滤波器采用该软件设计数字滤波器的前面板及流程图，并调试程序可以完成一些滤波器的功能。关键词：数字滤波器；无限冲激响应；LabVIEW华北电力大学本科毕业设计（论文）ⅡTHEDESIGNOFIIRDIGITALFILTERBASEDONLABVIEWAbstractAboutthebackgroundandthepresentsituationoffilterbasedonLabVIEW,thenthedefinition,classification,theperformanceofthedigitalfilterindexesforthecontentrelatedtoelaborate.ThenenumeratessomecharacteristicsofdigitalfilterIIRdigitalfilterandcommondesignmethodofanalogfilter,forexample,basedonthesimulatedfrequencytransformtogetlowpassfilter.Addedsomedenoisingofknowledge.TheimportantcontentofpaperistheintroductionofvirtualinstrumentLabVIEWsoftware.Understandingtheadvantagesanddisadvantagesofthissoftwarecomparedwithtraditionalinstrumentdesignsoftware,andthenthroughself-studyusingsoftware,thosewillhelptobefamiliarwiththesoftwarefunction,operation,andmakereadyfortocompletethetaskgoal(IIRdigitalfilterdesign,getthesimplefunctionofthefilter).ThelastofpaperisaboutontheLabVIEWplatformdesignwork,usingtheexistingIIRfiltertype,suchasButterworthfilter,Chebyshevfilterforfilteringfunctiondesign.Thethreemodulesdesignedmainly,respectivelyissignalgeneratingmodule,filtermodule,andfrequencyspectrumanalysismodule.Signalgeneratorisageneratesinewaveformsimulationsignalswithuniformwhitenoise.Throughthelow-passIIRfilter,thenoiseisfilteredout.Andthenthepaperanalyzesspectrum(amplitude)ofthesignalafterfiltering.DesignofIIRdigitalfilteradoptsdigitalfilterofthefrontpanelandthesoftwaredesignflowchart,andthedebuggercancompletesomefilterfunction.Keywords：Digitalfilter;Infiniteimpulseresponsedigitalfilter;LabVIEW华北电力大学本科毕业设计（论文）目录摘要.......................................................................................................................................................ⅠAbstract...............................................................................................................................................Ⅱ1绪论......................................................................................................................................................11.1课题背景.........................................................................................................................................11.2数字滤波器的现状和未来的发展趋势.......................................................................................22数字信号及数字滤波器概述............................................................................................................22.1数字信号.........................................................................................................................................22.2数字滤波器.....................................................................................................................................22.2.1数字滤波器的定义....................................................................................................................22.2.2数字滤波器的分类....................................................................................................................22.2.3数字滤波器性能指标................................................................................................................32.2.4数字滤波器设计原理................................................................................................................32.2.5数字滤波器除噪声方法............................................................................................................42.3IIR数字滤波器.............................................................................................................................52.3.1IIR数字滤波器介绍................................................................................................................52.3.2FIR与IIR数字滤波器分析比较...........................................................................................62.3.3IIR数字滤波器结构................................................................................................................72.3.4IIR数字滤波器设计方法........................................................................................................73.虚拟仪器及LabVIEW......................................................................................................................83.1虚拟仪器概述...............................................................................................................................103.1.1虚拟仪器主要特点..................................................................................................................133.1.2“虚拟”两字的解释...............................................................................................................143.1.3虚拟仪器的组成......