基于labVIEW虚拟滤波器的设计与实现

I常州轻工职业技术学院毕业设计报告班级：09信息631姓名：林亚庆学号：0936313118II摘要随着电子测试技术的不断发展，测试技术正向自动化、智能化、数字化和网络化的方向发展。其中数字滤波器作为测试技术的重要工具而被广泛使用于各个领域。本课题是以数字虑波表软件设计为工程背景，主要对采集的波形数据进行相关处理，实现了相应的参数测量。虚拟仪器技术是基于计算机的仪器及测量技术。与传统仪器技术不同，虚拟仪器技术指在包含数据采集设备的通用计算机平台上，根据需要可以高效率地构建起形形色色的测量系统。对大多数用户而言，主要的工作变成了软件设计。虚拟仪器技术突破了传统仪器的局限，可以将许多信号处理的方法方便的应用于测量中，并且为自动测量和网络化测量创造条件。首先，本论文介绍了虚拟仪器以及LabVIEW相关知识，利用虚拟仪器的开发平台——LabVIEW开发的软件系统，主要包括五个模块：数据采集、显示记录、数据回放、数据处理和数据分析。数据处理模块主要实现数字滤波和加窗处理两大功能，可以选择不同的滤波器和窗函数以适应不同的情况。参数的不同设置能够使信号频率不断变化。它是一种测试仪器和系统的概念及相关软件。另外结合测试技术和仪器的专业知识介绍在LabVIEW实现虚仪滤波器虑测试信号。也是高等院校中机械、自动化或信息技术相关专业学生必学的课程。关键词：虚拟仪器、LabVIEW、滤波器IIIAbstractSummaryWiththeelectronictestsandtechnologicaldevelopment,testingpositiveautomationtechnology,intelligence,digitalandnetworkdirection.Whichdigitalfiltertechnologyasanimportanttesttoolhasbeenwidelyusedinvariousfields.Thetopicisbasedonfiguresconsiderwaveformdesignsoftwareforengineeringbackground,theacquisitionofthemainwaveformdatacorrelation,realizethecorrespondingparametermeasurement.VirtualInstrumenttechnologyiscomputer-basedinstrumentsandmeasuringtechniques.Withthetraditionalinstrumentsandtechnology,virtualinstrumenttechnologyreferstothedataacquisitionequipmentincludesthegeneralcomputerplatform,Accordingtotheneedtobehighlyefficientbuildingupallkindsofmeasurementsystem.Formostusers,themainworkintothesoftwaredesign.Virtualinstrumenttechnologybreakthroughofthetraditionallimitationsoftheequipmentcouldbemanysignalprocessingmethodsusedinaconvenientmeasurement,andforautomaticmeasurementandnetworkmeasurementtocreateconditions.First,thethesisofLabVIEWvirtualinstrumentsandassociatedknowledge,usingvirtualinstrumentdevelopmentplatform--LabVIEWdevelopmentofthesoftwaresystem,includingthefivemainmodules:dataacquisition,recordsshow,dataplayback,dataprocessinganddataanalysis.Dataprocessingmodulemaindigitalfilteringandwindowinghandletwomajorfunctions,canchoosedifferentfiltersandwindowfunctiontoadapttodifferentsituations.Thedifferentparameterscanbesetupsothatthesignalfrequencyconstantlychanging.Itisatestinstrumentsandsystemsconceptsandrelatedsoftware.AnothercombinationoftestingtechnologyandequipmentexpertiseintroducedinLabVIEWvirtualinstrumentfilterconsidertestsignals.Aswellastertiaryinstitutionsmachinery,automationandinformationtechnology-relatedprofessionalstudentswilllearncourses.Keywords:virtualinstrument,LabVIEW,filterIV目录第一章引言..........................................................................................................................................1第一节虚拟仪器简介...................................................................................................................2第二节虚拟仪器的概念...............................................................................................................4第三节系统简介...........................................................................................................................7第四节虚拟仪器的发展...............................................................................................................9第五节虚拟仪器的工作原理.......................................................................................................9第六节LABVIEW特点.................................................................................................................10第七节虚拟仪器的组成.............................................................................................................11第八节虚拟仪器的设计与实现步骤.........................................................................................16第九节LabVIEW简介...............................................................................................................17第十节本论文设计任务.............................................................................................................19第二章滤波器....................................................................................................................................20第一节滤波器的简单介绍.........................................................................................................20第二节数字滤波器概念.............................................................................................................20第三节数字滤波器的分类.........................................................................................................20第四节数字滤波器的一般分析、设计方法.............................................................................22第五节数字滤波器的主要性能指标.........................................................................................23第三章设计实现................................................................................................................................26第一节滤波器及labVIEW实现..................................................................................................26第二节调用数字滤波器子程序的几个问题.............................................................................26第三节在labVIEW中设计滤波器..............................................................................................28第四章总结与展望............................................................................................................................34结束