数字滤波器设计中采样频率的作用和影响

(TI-DSPs:710072)a,,,,,(IIR),IIR,???,IIR,1IIRIIR,;,;sz,H(z),1IIR1IIR,,,,(fsö2),,,,,,,,zsz=eSTHa(s),H(z),skHa(s),T,NHa(s):Ha(s)=NK=1Aks-skH(z),:H(z)=NK=1Ak1-eSkTz-1,Ha(s)SkH(z)eSkTPöT,,T,fs=1öT,,,,,,,,[1],,,T,23320016JOURNALOFEEEEVol.23No.3Jun.2001a:2001213©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.=XpT,8s=XsT,XpXs,8p8s,T=1öfs,fs,,fs,,,fs,fsfs,;,fs,,T,,,T,,,,,,,3dBXp012P,Xs016P,1000Hz,T(1öfs),,H(z)=eAT(sinBT)z-11-2eAT(cosBT)z-1+e2ATz-2,H(za)T,,T,8p=XpT,eAT=e-(22)8pT=e-(22)XpBT=8pTö2=Xpö2H(z),H(z)=e-(22)Xp(sinXp2)z-11-2e-(22)Xp(cosXpö2)z-1+e-2Xpz-2,H(z)Xp,,,,fs,fs(1öT)fs(1kHz),,,,,,fs,,,8p=XpöT,Xp,T,8p,,22(fs1fs2),,,,,,,IIR3,,,,,,93233:©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:,1980211:,1997311:,1994FunctionandEffectofSamplingFrequencyonDigitalFiltersDesignLiYong,LianBaowang,ZhangYi(TIDSPLaboratory,Northwesternpolytechnicaluniversity,Xian710072,China)Abstract:Itisdifficultformostundergraduatestudentshowtounderstandthefunctionandeffectofsam2plingfrequencyinlearningdigitalsignalprocessingcourse.Inthispaper,theruleofsamplingfrequencyanditseffectondesigningIIRdigitalfiltersarediscussedindetailfromtwodifferentviewsofmathemati2calprinciplesandphysicalconcepts.AnumberofimportantpointstolearnthedesignofIIRdigitalfiltersarepresentedandreasonsofresultinginerrorrealizationtosamplingfrequencyareexplained.Keywords:digitalfilterdesign;samplingfrequency(29)TheTeachingReformandPracticeofElectronicTechniqueExperimentsCourseinTeachersCollegeHouJunyong(DepartmentofPhysics,SichuanTeachersCollege,Nanchong637002,China)Abstract:Thispaperanalysesthequestionsofelectronicexperimentscourseinteacherscollege,andthestepsontheteachingreformarepresented:attachingimportancetoelementtechnicalability;masteringnewtechnology;payingattentiontotrainingabilitybringforthnewideasandmoralcharacter.Keywords:electronictechniqueexperiments;teachingreform;ability;bringforthnewideas(34)TheResearchandPracticeonTheTeachingReformationofElectricCircuitCourseYangYuxia,ZhangYuzheng,WangJunkun,GaoJinfeng(ZhengZhouUniversity,ZhengZhou450002,China)Abstract:Withconsiderationofthemainproblemlyingintheteachingprocessofelectriccircuitcourse,suchasthecontradictionamongcurriculumsystem,teachingcontentsandclasshours,theproblembe2tweenteachingmethodandcultivationofinitiativeandinnovationofstudents,theunificationproblemoftheorystudyandtheabilityofoperation,andtheinconsistencybetweenexaminationgoalandqulityeduca2tion,wehavemadetheall2sidedinnovationandpractice.Keywords:electriccircuit;teachingreformation;innovation;qualityeducation0420016©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.