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1、、学位论文太原工业学院学位论文英文翻译作者姓名：学科、专业：通信工程学号：指导教师：完成日期：英文原文：18、IntroductionofdigitalfrequencymeterDigitalFrequencyofcommunicationsequipment,audioandvideo,andotherareasofscientificresearchandproductionofanindispensableinstrument.ProgrammingusingVerilogHDLDesignandImplementationofthe
2、digitalfrequency,inadditiontotheplasticpartofthemeasuredsignal,anddigitalkeyforapartoftheshow,allinanFPGAchiptoachieve.Theentiresystemisverylean,flexibleandhaveamodificationofthescene.1AndotherprecisionmeasuringfrequencyPrinciple.Frequencymeasurementmethodscanbedividedintot
3、wokinds:(1)directmeasurementmethod,thatis,atacertaintimemeasurementgatemeasuredpulsesignalnumber.(2)indirectmeasurements,suchasthecyclefrequencymeasurement,VFconversionlaw.FrequencyMeasurementindirectmeasurementmethodappliesonlytolow-frequencysignals.Basedontheprinciplesoft
4、raditionalfrequencymeasurementofthefrequencyofmeasurementaccuracywillbemeasuredwiththedeclineinsignalfrequencydecreasesinthemorepracticallimitations,suchastheaccuracyandfrequencyofmeasurementnotonlyhashighaccuracy,butalsointhewholefrequencyregiontomaintainconstanttestaccura
5、cy.ThemainmethodofmeasurementfrequencymeasurementPreferencesgatedsignalGATEissuedbytheMCU,GATEtimewidthonthefrequencymeasurementaccuracyoflessimpact,inthelargercontextofchoice,aslongastheFPGAin32of100inthecounterbMSignalsarenotoverflowline,inaccordancewiththetheoreticalcalc
6、ulationGATEtimecanbegreaterthanthewidthTc42.94s,butduetothesingle-chipmicrocomputerdataprocessingcapacityconstraints,theactualwidthoflesstime,generallyintherangeofbetween0.1schoice,thatis,high-frequency,shortergate;,lowgatelonger.ThistimegatewidthTcbasedonthesizeofthemeasur
7、edfrequencyautomaticallyadjustfrequencymeasurementinordertoachievetheautomaticconversionrange,andexpandedtherangeoffrequencymeasurement;realizationoftheentirescopeofmeasurementaccuracy,reduce18、thelow-frequencymeasurementerror. Thedesignofthemainmethodsofmeasuringthefreq
8、uencymeasurementandcontrolblockdiagramasshowninFigure1.Figure1Preferencesgatedsign
