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1、FrequencyAnalyzerYangXiaoM2013705103HuaZhongUniversityofScienceandTechnologySchoolofMechanicalScienceandEngineeringAbstract:MatlabIsanumericalanalysis,matrixcalculation,scientificdatavisualizationandnonlineardynamicstatesystemmodelingandsimulation,andotherfunctionsofpra
2、cticalsoftwareengineering.It’seasytousethewindowsenvironmentandcastoffatraditionontheinteractiveprogramminglanguage(suchasC,Fortran)EditmodeInlargerange.Inthisreport,Thetaskistodesignafrequencyanalyzerbyusingmatlab.Keyword:frequencyanalyzer;Matlab;time-domainanalysis;fr
3、equency-domainanalysis;1.PrefaceMATLABiscalledMatrixLaboratory，whichisdesignedbytheUnitedStatesMathWorkscompany.It’sacommercialmathematicalsoftware.MatlabcanbeuseforMatrixoperations,mappingfunctionsanddata,algorithm,creatingtheuserinterface,connecttootherprogramminglang
4、uagesprocedures,mainlyusedinengineeringcalculations,controldesign,signalprocessingandcommunications,imageprocessing,signaldetection,designandfinancialmodelinganalysisandotherfields.GUI(GraphicalUserInterface,referredtoasGUI,knownGraphicalUserInterface)isdisplayedusingth
5、egraphicaluserinterfaceofcomputeroperations..MatlabhasapowerfulGUltool.Inthisreport,byusingmatlabGUItoolwecoulddesignafrequencyanalyzer.Frequencyanalyzeristheinstrumentwhichcouldbeusedtostudythestructureoftheelectricalsignalspectrum,andusedtomeasurethesignalparametersof
6、signaldistortion,modulation,frequencystabilityandspectralpurity.Frequencyanalyzercouldbeusedtomeasuresomeparametersofamplifierandfiltercircuitsystem,anditisakindofmultipurposeelectronicmeasuringinstrument.FFT(FastFourierTransformation)isthefastalgorithmofDFT(discreteFou
7、riertransformtion),whichisbasedondiscreteFouriertransform.ByusingFFTwecouldgettheanswerfasterthanDFT.2.IntroduceThefrequencyanalyzerwhichisdesignedbyusingmatlabhavethreemodels:record,playwavfileandgeneratorsomewaves.Everymodelcouldmakethreekindsofwaveforms:thetimedomain
8、figure,thefrequencyspectrumdomainfigureandthepowerspectrumfigure.Wecouldgetthemessagewewantfromthefrequencyana
