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1、Lesson11Filter《电子技术专业英语教程》冯新宇主编电子工业出版社www.phei.com.cnUnit4PowerLesson11FilterBackgroundsTexttourLanguageinuseVocabularyStructureReading/writingtechniques7/10/20212《电子技术专业英语教程》TerminologyElectronicfiltersIIRfilterFIRfilterBackgrounds7/10/20213《电子技术专业英语教程》Terminology7/10/20214
2、《电子技术专业英语教程》lowpassfilter低通滤波器bandpassfilter带通滤波器bandstopfilter带阻滤波器frequencyresponses频率响应7/10/20215《电子技术专业英语教程》ElectronicfiltersElectronicfiltersareelectroniccircuitswhichperformsignalprocessingfunctions,specificallytoremoveunwantedfrequencycomponentsfromthesignal,toenhance
3、wantedones,orboth.Electronicfilterscanbe:passiveoractiveanalogordigitalhigh-pass,low-pass,bandpass,band-reject(bandreject;notch),orall-pass.discrete-time(sampled)orcontinuous-timelinearornon-linearinfiniteimpulseresponse(IIRtype)orfiniteimpulseresponse(FIRtype)7/10/20216《电子技
4、术专业英语教程》ElectronicfiltersThemostcommontypesofelectronicfiltersarelinearfilters,regardlessofotheraspectsoftheirdesign.7/10/20217《电子技术专业英语教程》IIRfilterIIRfiltersmaybeimplementedaseitheranalogordigitalfilters.IndigitalIIRfilters,theoutputfeedbackisimmediatelyapparentintheequatio
5、nsdefiningtheoutput.NotethatunlikewithFIRfilters,indesigningIIRfiltersitisnecessarytocarefullyconsider"timezero"caseinwhichtheoutputsofthefilterhavenotyetbeenclearlydefined.7/10/20218《电子技术专业英语教程》FIRfilterAfiniteimpulseresponse(FIR)filterisatypeofadigitalfilter.Theimpulseresp
6、onse,thefilter'sresponsetoaKroneckerdeltainput,isfinitebecauseitsettlestozeroinafinitenumberofsampleintervals.Thisisincontrasttoinfiniteimpulseresponse(IIR)filters,whichhaveinternalfeedbackandmaycontinuetorespondindefinitely.TheimpulseresponseofanNth-orderFIRfilterlastsforN+
7、1samples,andthendiestozero.7/10/20219《电子技术专业英语教程》OutlineBriefintroduction(para.1-6)LowpassFilters(para.7-8)HighpassFilters(para.9-10)BandpassFilters(para.11-13)BandstopFilters(para.14-15)Texttour7/10/202110《电子技术专业英语教程》BriefintroductionAfiltercanhavealowpass,highpass,bandpass
8、,orbandstopresponsecanalsobedescribedbythemethodusedtoapproximatetheidealfi
