【MOOC】Digital Signal Processing-University of Electronic Science and Technology of China 中国大学慕课MOOC答案

【MOOC】DigitalSignalProcessing-UniversityofElectronicScienceandTechnologyofChina中国大学慕课MOOC答案Topic1HomeworkTopic1Test1、【单选题】Inanactualcommunicationsystem,theinputandoutputsignalformsinthedigitalsignalprocessing(DSP)moduleareusuallyrespectively本题答案：【Digitalsignal,Digitalsignal,】2、【多选题】Comparedwithanalogsignalprocess,theadvantageofdigitalsignalprocessincludes本题答案：【TheaccuracyoftheDSPismoreguaranteed.#TheDSPsystemiscorrespondingtomultiplefunctions.#TheDSPhasbetterreliabilityandrepeatability.】SamplingtheContinuousSignalsQuiz1、【单选题】Aanalogsinusoidalsignalxa(t)=cos(6πt)u(t)，issampledatsamplingfrequencyof12Hz.Itsdiscrete-timesequenceis_本题答案：【1,0,-1,0,1,0,-1,0,…】2、【单选题】(1)Giventhatcontinuous-timesignalxa(t)=4sin(20πt)-5cos(40πt)+3sin(120πt)+2cos(176πt),tosamplethesignal,itsminimumsamplingfrequencysatisfyingNyquistrateamongthefollowingis_本题答案：【320Hz】DiscreteTimeSignalsQuiz1、【单选题】Whichofthefollowingdiscretesequencesisnotaperiodicsequence？本题答案：【x[n]=cos(5π/7–5n/9)】2、【单选题】Determinetheexpressionforthey[n]ofthesystemshowninthefollowingfigure本题答案：【y[n]=p0x[n]+p1x[n-1]–d1y[n-1]】ReconstructionofContinuousSignalsQuiz1、【单选题】SupposeaDigital-to-AnalogConversionsystemwiththesamplingfrequencybeing1kHz.Iftheoriginalsignalcanbefullyrecovered,thefrequencyresponseofthereconstructionfilterHr(jΩ)oftheDACis本题答案：【】2、【单选题】SupposeaDigital-to-AnalogConversionsystemwiththesamplingfrequencybeing1kHz.Iftheoriginalsignalcanbefullyrecovered,theimpulseresponsehr(t)ofthereconstructionfilteroftheDACis本题答案：【】FiniteWordLengthinADCQuiz1、【单选题】Floatingpoint144.0isrepresentedbyan8-bitbinaryfixedpointas________,andthebinaryfloatingpointrepresentationbasedontheIEEE32-bitstandardis________本题答案：【10010000,01000011000100000000000000000000】2、【单选题】DuringADCconversion,asinusoidalsignalwithamplitudebeing1isinputandtheADCoperatesatfullrange.Whenthequantizationwordlengthb=8bits(onesymbolbitandsevendatabits),theSNRofthequantizationprocessisapproximately本题答案：【50dB】Topic2HomeworkTopic2Test1、【单选题】Acontinuous-timesignalxa(t)=4sin(20πt)issampledatfrequencyf=40Hz，determinethevalueofsamplex[1]=_____本题答案：【4】2、【单选题】Whichofthefollowingequationisright？本题答案：【】3、【多选题】Considerthecontinuous-timesignalxa(t)=4sin(20πt)，whichofthefollowingfrequencieswon’tcausefrequencyspectrumoverlap_______本题答案：【40Hz#80Hz】4、【判断题】Thesamplingfrequencyisonlydeterminedbythehighestfrequencycomponentofthesignal.本题答案：【错误】5、【填空题】Inthetimedomain，theprocedureofrestoringtheoriginalcontinuous-timesignalfromdiscretesamplevaluesiscalled_______本题答案：【interpolation】TheImportanceofSignalAnalysisinTransformDomainQuiz1、【多选题】Whydowedotransformationdomainanalysisofsignals？本题答案：【richeranalyticalmethods.#moreprominentsignalcharacteristics.#theanalysisoftheproblemcanbesimplified.】DTFTFromCTFTQuiz1、【单选题】WhatistherelationshipbetweenthetimedomainandthefrequencydomainofCTFT?本题答案：【Thecontinuoussignalintimedomainandthenonperiodicsignalinfrequencydomain.】TheDefinitionofDTFT-1Quiz1、【单选题】本题答案：【】2、【单选题】本题答案：【】3、【填空题】WithoutcomputingtheDTFT,determinewhichofthefollowingDTFTshaveaninversetransferthatisanoddsequence_(directlywritetheletterofeachchoicewithoutanyblanksorotherSymbols,suchas'abc')本题答案：【bc】TheDefinitionofDTFT-2Quiz1、【单选题】本题答案：【Thesequenceisnotabsolutelysummable,butthesquaresummable.】2、【单选题】本题答案：【】TheDefinitionofDTFT-3Quiz1、【单选题】本题答案：【3142π】2、【单选题】本题答案：【】Topic3-1HomeworkTopic3-1Test1、【单选题】本题答案：【】2、【单选题】本题答案：【】3、【单选题】WhichofthefollowingistrueaboutthemagnitudespectrumandphasespectrumofDTFT？本题答案：【Ifthephasespectrumofadiscrete-timesignalalwayshasadiscontinuousamplitudeatπand-πwithajumpof2π,itispossibletobebroughtbyphasewrap.】4、【多选题】本题答案：【Itisabsolutesummable.#Itissquaresummable.#ItsDFTexists.#Ithasfiniteenergy.】5、【多选题】WhichofthefollowingisfalseabouttherelationshipbetweenDTFTandCTFT？本题答案：【SpectrumofDTFTcanbeobtainbyextendingthecontinuous-timesignalperiodicallybysamplingfrequency.#DTFTandCTFTaretotallydifferentconceptfordiscrete-timesignalandcontinuous-timesignalandcannotbeconnected.】6、【多选题】DuringthesolutionofDTFTasfollows,whichpropertieareused？本题答案：【Linearitytheorem#Time-shiftingtheorem】7、【判断题】Ifasequencex[n]iseven,itsDTFTmustbeconjugatesymmetric.本题答案：【错误】ClassificationoftheDiscrete-TimeSystemQuit1、【单选题】本题答案：【nonlinear,time-invariant,causal,stable】2、【判断题】Inthistextbook，wedealsonlywithlineartime-invariantcausalstablesystems,becauseinpractical,allsystemsarelineartime-invariant.本题答案：【错误】LTIDiscrete-TimeSystemQuit1、【单选题】Giveny[n]=2x[n]+x[n-2]-3y[n-2]-y[n-1],thesystemis__本题答案：【IIRsystem】2、【判断题】Anydiscrete-timesystemcanbedenotedbytheimpulseresponseh[n],thatis,theoutputy[n]generatedbyanyinputx[n]isequaltotheconvolutionoftheinputx[n]withtheimpulseresponseh[n].本题答案：【错误】LTIDiscrete-TimeSysteminTransformDomainQuit1、【单选题】本题答案：【】2、【单选题】本题答案：【ROC:|z|0.5】FilterConceptQuiz1、【单选题】ThefollowingstatementsaboutMoving-AveragefiltersandMedianfiltersarewrong____本题答案：【Underthesameorder,thefilteringeffectofthemovingaveragefilterisbetterthanthatofthemedianfilter.】2、【多选题】Whichofthefollowingstatementsaboutfiltersarecorrect______本题答案：【Thefilterisafrequencyselectiontool,withlow-pass,high-pass,band-passandband-stoptypes.#Thefilterdesignisgenerallycompletedbyspecialsoftwareintheengineering.#Afilterisacommondiscrete-timesystem.】Topic4HomeworkTopic4Test1、【单选题】本题答案：【】2、【单选题】AcausalLTIIIRdigitalfiltercanbedescribedbytheconstantcoefficientlineardifferenceequationasfollow:ItstransferfunctionH(z)is本题答案：【】3、【单选题】Considerusingmoving-averagefilterandmedianfiltertoremovenoisefrominputsignalx[n]=s[n]+d[n]，wheres[n]isusefulsignalandd[n]isnoise.Whenthedistributionofd[n]isuniformamong(-1,1),itismorepropertouse()filter；Whend[n]isimpulsenoise,itismorepropertouse()filter.本题答案：【moving-average；median】4、【单选题】Consideradigitalfilterwiththefrequencyresponseasfollow（theshadedpartisit’spassband），whichoffollowingdescriptionisright（）？本题答案：【Thisisaband-passfilter.】5、【单选题】Pleasegivetheresultofmediafilter:med{2,-3,10,5,-1}andmed{2,2,80}are本题答案：【2,2】6、【单选题】本题答案：【Nonlinearandtime-invariant】7、【单选题】Foreachofthefollowsystems，x[n]isinputandy[n]isoutput.（）isnon-causalsystem.本题答案：【】8、【单选题】Foreachofthefollowingsystems，x[n]isinputandy[n]isoutput.（）isstablesystem.本题答案：【】9、【单选题】本题答案：【】10、【单选题】本题答案：【TheformerisIIRsystem,andthelatterisFIRsystem.】11、【单选题】本题答案：【2】TheDefinitionofDFTQuiz1、【单选题】WhichofthefollowingstatementsaboutDFTiswrong_本题答案：【Thespectrumofthediscrete-timesignalcannotbeaccuratelyrepresentedbecauseDFTisdiscrete.】2、【单选题】本题答案：【】TheRelationshipofDFTandDTFTQuiz1、【多选题】WhichofthefollowingstatementsaretrueaboutDTFTandDFT____本题答案：【TheDTFTspectrumiscontinuousandDFTspectrumisdiscrete.#ThereissomecertainrelationshipbetweenDTFTandDFTofasamesignal.】2、【多选题】WhichofthefollowingstatementsaretrueaboutDFS___本题答案：【DFSisatransformationtodescribethespectrumofperiodicsignals,andDFTisatransformationtoafinitelengthsequencefrom0toN-1(Nbeingtheperiod)ofthisperiodicsignal.#GiventheDFTofalength-Nsequence,theDFSoftheperiodicsequenceobtainedbyperiodizationofthesequenceaccordingtotheperiodofNcanbeobtaineddirectlybyperiodizationoftheDFToftheoriginalsequence.】DFTPropertiesQuiz1、【单选题】LetG[k]andH[k]denotedthe8-pointDFTofalength-8sequenceg[n]andh[n],本题答案：【】FFT-1Quiz1、【单选题】WhichofthefollowingstatementsarewrongabouttheDFT'sfastalgorithm,FFT_本题答案：【FFTisanewtransformationbasedonDFT.】2、【单选题】Developtheflow-graphfortheFFTalgorithmforalength-16sequenceformtheradix-2DITFFTalgorithm.本题答案：【】FFT-2Quiz1、【单选题】Giventwo1024-pointsequences,whentheyaredonecircularconvolutionof____points,theresultisconsistentwiththeresultoftheirlinearconvolution.本题答案：【2047】2、【判断题】TheIFFTalgorithmdoesnotneedtobederivedspecially.Firstly,theinputX[k]needstobeconjugated.SecondlyperformingFFT.Lastly,itsresultisconjugatedandmultipliedbyafactorof1/N.本题答案：【正确】Topic5HomeworkTopic5Test1、【单选题】本题答案：【】2、【单选题】Foralength-8sequencex[n]，itsDFTisX[k]，andalength-16sequencey[n]isasfollows，本题答案：【】3、【单选题】ForaN-pointsequencex[n],itsN-pointDFTisX[k].PleaseuseX[k]torepresenttheDFTofthefollowingsequence:本题答案：【X2[k]】4、【单选题】Whatistheeffectoffrequencydomainsamplingonsignaltimedomain?本题答案：【periodication】5、【单选题】本题答案：【】6、【单选题】A8-pointsequenceiscalculatedbasedonDIF（DecimationInFrequency）FFTalgorithm.Whichoneofthefollowingisthecorrespondingbutterflycomputationdiagram?本题答案：【】7、【单选题】Supposealength-16sequencex[n]needstobereorderedinbit-reversedorder,thenitisusedasaninputtoaFFTalgorithm.Thesamplenumberofthesequenceinbit-reversedorderis:本题答案：【】8、【单选题】Asystemimpulseresponseh[n]isa50-pointsequence.Averylonginputsequencex[n]ispassedintothesystemtoperformFFT.Requirements:Theinputsamplesaredividedintosegmentsforevery100samples,andeachsegmentmustoverlapwithPsamples;AndQsamplesaretakenoutfromeachsegmentoutput,andtherequiredoutputcanbeobtainedbyconnectingtheremainingsamplestogether;Using128-pointFFT.DeterminePandQ.本题答案：【P=49，Q=51】9、【判断题】本题答案：【错误】ztransform-1Quit1、【单选题】Whichofthefollowingstatementsaboutthez-transformisnottrue?本题答案：【Asequencehasz-transform,whichmeansthez-transformexistsatanypositiononthezplane.】2、【单选题】本题答案：【】ztransform-2Quiz1、【单选题】本题答案：【Thezerosare0and-0.514,thepolesare-3and-0.6.】2、【单选题】本题答案：【】ztransform-3Quiz1、【单选题】本题答案：【】2、【单选题】本题答案：【】Inverseztransform-1Quiz1、【单选题】本题答案：【】2、【单选题】本题答案：【x[n]={7,-2.7,1.17,-0.567,0.2997,...}(n≥0）】Inverseztransform-2Quiz1、【单选题】本题答案：【】Topic3-2HomeworkTopic3-2Test1、【单选题】本题答案：【】2、【单选题】WhichofthefollowingstatementisfalseabouttheinverseZT？本题答案：【ThecontourintegraldefinitionofinverseZTcanbesolvedonlybyResidueMethodorcontourintegration.】3、【单选题】本题答案：【】4、【单选题】本题答案：【ROC:|z|2,DTFTconverges】5、【单选题】本题答案：【x[0]=1，x[1]=-2/3，x[2]=2/9，x[3]=-2/27，x[4]=2/81】6、【单选题】Whichz-transformsofthefollowingsequencesarethesame?本题答案：【Alldifferent】7、【单选题】WhichofthefollowingdescriptionaboutROCofz-transformisright？本题答案：【IftheROCofthez-transformofasequenceincludestheunitcircle,itsDTFTexists.】8、【多选题】Considerz-transform本题答案：【|z|1/2，左边序列#1|z|2，双边序列#|z|2，右边序列】9、【多选题】Considerthez-transformofasequencewithitspole-zeroplotasfollowing:Itsz-transformmightbe本题答案：【#】10、【判断题】Complexvariablezinthedefinitionofz-transformcanbeexpressedas本题答案：【正确】TheClassificationBasedonmagnitudeQuiz1、【单选题】FromthedefinitionoftheBRsystem，wecansaythat_本题答案：【theoutputenergyofthesystemislessthanorequaltotheinputenergy.】All-PassTransferFunctionQuiz1、【单选题】Amongsystemswithfollowingzero-poledistributionrelations，theallpasssystemis____本题答案：【】2、【多选题】Whichofthefollowingstatementsarecorrectaboutthephasecharacteristicsofall-passsystems____本题答案：【Thephasefunctionoftheall-passsystemisamonotonicallydecreasingfunction.#Thegroupdelayoftheall-passsystemispositive.】Max-phaseandMin-phaseTransferFunctionQuiz1、【单选题】本题答案：【mixedphasesystem.】2、【单选题】本题答案：【】Linear-phaseTransferFunctionQuiz1、【单选题】Inthefollowingsequences,whichsequencewillhavelinearphase?本题答案：【】2、【单选题】GivenaTypeⅠFIRsystemoflength-9,itsphasefunctionis___本题答案：【】Topic6HomeworkTopic6Test1、【单选题】Whichofthefollowingsystemsisanall-passsystem?本题答案：【】2、【单选题】本题答案：【】3、【单选题】本题答案：【】4、【多选题】Forthetransferfunctionofall-passsystems,whichofthefollowingstatementsarecorrect?本题答案：【All-passsystemscanbeusedtoassisttheimplementationofastablesystem.#All-passsystemscanbeusedtoassisttheimplementationofalinear-phasesystem.#All-passsystemscanbeusedtoassisttheimplementationofaminimumphasedelaysysteminacertainmagnitudecharacteristic.】5、【多选题】本题答案：【#】BlockdiagramRepresentationofDigitalFiltersQuiz1、【单选题】Givenadiscretetimesystemblockdiagram本题答案：【】2、【单选题】Givenadiscretetimesystemblockdiagramdetermineitstransposestructure.本题答案：【】BasicFIR&IIRDigitalFilterStructuresQuiz1、【单选题】WhichofthefollowingstatementsabouttheIIRdirectimplementationstructureiscorrect____本题答案：【Thedirect-formIrequiresmorecomputationthanthedirect-formII.】2、【判断题】Thedirect-formofFIRfiltersandthedirect-formofIIRfiltersarehighlysensitivetocoefficientsquantization,sotheyarenotusuallyusedinengineering.Cascadestructureisgenerallyusedinengineering.本题答案：【正确】DigitalfilterSpecificationsandFDAtoolQuiz1、【单选题】Anfilter’spassbandrippleisδp=0.102，anditsstopbandrippleisδs=0.001.Determineit'speakpassbandrippleαpandminimumstopbandattenuationαs___本题答案：【αp=0.93dB，αs=60dB】2、【单选题】Thespecificationsofthedigitallowpassfilterareasfollows:thepassbandedgefrequencyfp=1.5kHz,thestopbandedgefrequencyfs=2.3kHzandthesamplingfrequencyft=10kHz.Thedigitaledgefrequenciesofthefilteris__本题答案：【ωp=0.3π，ωs=0.46π】Topic7-1HomeworkTopic7-1Test1、【单选题】本题答案：【】2、【单选题】Designalow-passdigitalfilterforfilteringanalogsignals.Itspassbandfrequencyis1.25kHz，andstopbandfrequencyis3.4kHz.Thesamplingfrequencyis8kHz.Thenormalizedcutofffrequencyofthedigitallow-passfilteris()本题答案：【ωp=0.3125π，ωs=0.85π】3、【多选题】WhichofthefollowingstructuresarethebasicIIRfilterstructures?本题答案：【Thedirect-formIstructure.#Thedirect-formIIstructure.#Thecascade-formstructure.#Theparallel-formstructure.】4、【多选题】WhichofthefollowingdiscussionaboutFIRandIIRfiltersarewrong？本题答案：【TheIIRfiltercanalsoachievelinearphase.#Toachievethesamefilterspecifications,theorderofFIRfilterisusuallylessthanthatofIIRfilter.】5、【多选题】InthebasicstructuresofIIRfilter，whichstructuresaremoresensitivetothequantizationeffectofcoefficients？本题答案：【Thedirect-formIstructure.#Thedirect-formIIstructure.】6、【判断题】Thereisadelay-freeloopinthedigitalfilterstructureshowninthefigurebelow本题答案：【正确】IIRFilterDesign-1BasicIdeaQuiz1、【单选题】Giventheselectionparameterk=0.3538andthediscriminationparameterk1=0.0631ofabutterworthfilter,theorderofthefilteris___本题答案：【3rd-order】2、【多选题】Mappingfromstoz,whatconstraintsmustbesatisfied?本题答案：【Thelefthalfpartofsplaneneedstobemappedinsidetheunitcircleofzplane.#Theimaginaryaxisofsplaneneedstobemappedtotheunitcircleofzplane.】IIRFilterDesign-2ImpulseInvarianceMethodQuiz1、【单选题】Givenasinglepoles1onthesplane,whichismappedtothezplanebytheimpulseresponseinvariancemethod,itwillbecome____onthezplane.本题答案：【asinglepolez1=es1T】2、【判断题】Impulseresponseinvariancemethodestablishestherelationshipbetweenimpulseresponseofanalogprototypefilteranddigitalfilterintimedomain,.Thusstozmappingrelationshipisderived.本题答案：【正确】IIRFilterDesign-3BilinearTransformationMethodQuiz1、【单选题】Thespecificationsofadigitallowpssfilterareasfollows:passbandedgefrequencyωp=0.3π,stopbandedgefrequencyωs=0.48π,byusingbilineartransformationmethodandButterworthanalogprototypefiltertodesign.ThecorrespondinganalogedgefrequencyΩpandΩsofthefilterare_______respectively.本题答案：【】2、【多选题】Whichofthefollowingstatementsarecorrectaboutimpulseresponseinvariantmethod？本题答案：【Thebilineartransformationcanobtainthelinearcorrespondencebetweenthecut-offfrequencyofanalogprototypefilterandthatofdigitalfilter.#Thebilineartransformationsareone-to-onemapping.】FIRFilterDesign-1BasicIdeaQuiz1、【单选题】Whichofthefollowingstatementsiswrongabouttheleast-integral-squareerrorcriterioninFIRfilterdesign？本题答案：【When本题答案：【正确】FIRFilterDesign-2WindowSeriesMethodQuiz1、【单选题】WhichofthefollowingstatementsiscorrectabouttheGibbsphenomenon？本题答案：【IncreasingthetruncationlengthNofthetimedomainimpulseresponsewillreducethewidthofthetransitionbandwidth.】2、【单选题】ThroughthediscussionofGibbsphenomenon,itcanbeseenthatinordertoobtainthespectrumwithlessdistortionthantheidealspectrum,weneedtoaddawindowwith___________________________本题答案：【themainlobewidthshouldbeasnarrowaspossibleandtherelativesidelobelevelshouldbeashighaspossible.】FIRFilterDesign-3FixedWindowFunctionsQuiz1、【单选题】AccordingtothespecificprocessofdesigningFIRfiltersbywindowfunctionmethod,therelationshipbetweenpassbandandstopbandrippleofFIRfilterdesignedbythismethodisasfollows本题答案：【thepassbandrippleisequaltothestopbandripple.】2、【多选题】Ifyouneedtoselectawindow,theminimumstopbandattenuationrequiredtobe45dB.Thewindowsyoucanchooseare__本题答案：【Hammingwindow.#Blackmanwindow.】Topic7-2HomeworkTopic7-2Test1、【多选题】What’sthedifferencebetweentheimpulseinvariancemethodandbilineartransformationmethodintheprocessofdesigningtheIIRfilter？本题答案：【Whencalculatingthecutofffrequencyoftheanalogprototypefilteraccordingtothedigitalcutofffrequency,differentformulasareusedintwomethods.#Whenmappinganalogprototypefiltertodigitalone,differentmappingareusedintwomethods.】2、【多选题】Whichofthefollowingstatementsarecorrectaboutbilineartransformationmethod?本题答案：【Bilineartransformationintroducesone-to-onemapping,soitgetsthename.#Thoughthereis'linear'initsname,bilineartransformationisakindofnon-lineartransformation.】3、【多选题】ConsiderusingwindowingfunctionmethodtodesignFIRfilterwithrippleinthepassbandlessthan0.006andthatinthestopbandlessthan0.008，whichwindowfunctionshouldbechoose？本题答案：【Blackmanwindow#Hammingwindow】4、【判断题】WhendesigningaFIRfilterthroughwindowingfunctionmethod,weshouldchooseawindowwithnarrowmainlobewidthandhighrelativesidelobelevellikerectangularwindow.本题答案：【错误】5、【填空题】DesignaFIRfilterbasedonwindowingfunctionmethod.ConsiderusingHannwindowwithitspassbandandstopbandedgefrequency.Accordingtothetableonthetextbook,calculatetheleastorder_______forthefilter.本题答案：【[41,42]】DSPfinalexamination1、【单选题】Ananalogsignalcontainsseveralpuresinusoidalcomponents:alinearcombinationof100Hz,150Hz,200Hzand500Hz.Samplingitat1800Hz,whichofthefollowingfrequencycomponentsdoesn’tcontainintheresultdiscretetimesignal？本题答案：【3600Hz】2、【单选题】Ananalogsignalwhichislinearlycomposedofthreesingle-frequencysinusoidalcomponentsF1,F2andF3，issampledatasamplingfrequencyof1000Hz.Afterthediscrete-timesignalpassingthroughalow-passfilterwithacut-offfrequencyof850Hz,theresultingfrequencycomponentsare200Hzand350Hz.ThenthepossiblecombinationsofF1,F2andF3are:本题答案：【1200Hz,200Hzand1650Hz】3、【单选题】Ananalogsignalx(t)=4sin(0.34πt)issampledwiththefrequency20Hz,thentheexpressionofthediscretetimesignalx[n]is本题答案：【x[n]=4sin(0.017πn)】4、【单选题】Giventhesequence本题答案：【】5、【单选题】Giventheztransform,thentheinversetransformis___本题答案：【aleft-sidedsequence】6、【单选题】Theztransformofacausalstablesequenceis本题答案：【|z|0.8】7、【单选题】Thediscretetimesystem本题答案：【stablesystem】8、【单选题】本题答案：【{5163460615232}(0≤n≤6)】9、【单选题】本题答案：【Onezeropointz=0.2,twopolesz=0.9andz=-0.5.】10、【单选题】本题答案：【】11、【单选题】WithoutcomputingtheIDTFT,determinewhatkindofsequencedoesthespectrumshowninthefigurebelowcorrespondtointhetimedomain?本题答案：【aconjugatesymmetricsequence】12、【单选题】本题答案：【】13、【单选题】本题答案：【】14、【单选题】WhichofthebasicrealizationstructuresofIIRfiltersiscommonlyusedinengineering?本题答案：【Cascaderealizationstructure】15、【单选题】本题答案：【】16、【单选题】本题答案：【】17、【单选题】本题答案：【】18、【单选题】本题答案：【】19、【单选题】Designadigitallow-passfilterwithapassbandedgefrequencyof1kHz,astopbandedgefrequencyof1.5kHzandasamplingfrequencyof8kHz.Whatarethecorrespondingnormalizededgefrequenciesωpandωs?本题答案：【ωp=0.25π，ωs=0.375π】20、【单选题】本题答案：【{01-2.20.52-0.28......}(n≥0)】21、【单选题】WhatisthenameofthevisualizationtoolthatcanbeusedtodesigndigitalfiltersinMATLAB?本题答案：【FDAtool】22、【单选题】InMATLAB,thefunctionfordrawingdiscretesamplingpointsis（）本题答案：【stem】23、【单选题】Giventheevenpointvalueofthe11-pointDFTofan11-pointrealsequence:X[0]=4,X[2]=-1+j3,X[4]=2+j5,X[6]=9-j6,X[8]=-5-j8及X[10]=3-j2.thendetermineX[7]=?本题答案：【X[7]=2-j5】24、【单选题】WhatisthedifferencebetweenthedirecttypeIrealizationandthedirecttypeIIrealizationbofIIRfilters?本题答案：【ThedirectIrealizationrequiresmoredelayunitsthanthedirectIIrealization.】25、【单选题】本题答案：【】26、【单选题】Knownonepolep1=0.5andonezeroz1=-3ofa2nd-orderall-passfilterA(z),thentheotherzeropointandzeroonepoleare（）本题答案：【p2=-1/3,z2=2】27、【单选题】本题答案：【minimum-phasesystem.】28、【单选题】RegardingtheGibbsphenomenon,whatisthecorrectoptioninfollowingstatements？本题答案：【IncreasingthetruncationlengthNwillreducethewidthoftransitionband.】29、【多选题】Whicharecorrectamongthefollowingstatementsaboutdigitalsignalprocessingandanalogsignalprocessing?本题答案：【Digitalsignalprocessingismoreaccuratethananalogsignalprocessing.#Digitalsignalprocessingismorereliableandrepeatablethananalogsignalprocessing.#Certainapplicationscanonlybecompletedbydigitalsignalprocessing,suchaslosslesscompressionofinformation,Notchfilters,etc.】30、【多选题】Theapplicationfieldsofdigitalsignalprocessinginclude:本题答案：【Mobilecommunication#Imageprocessing#Industrialautomation#Consumerelectronics】31、【多选题】Alargenumberofsignalsinnatureexistinanalogform.Touseadigitalsignalprocessingsystemtoprocessthesesignals,whichofthefollowingprocessesmustbeused?本题答案：【Timedomainsampling#Timedomainquantization】32、【多选题】Whichofthefollowingstatementsarewrongabouttransformdomainanalysisofdiscretetimesignals？本题答案：【Transformdomainanalysisofdiscretetimesignalsistheonlymeansofdiscretetimesignalanalysis.#Transformdomainanalysisofdiscretetimesignalsisadispensablemeansofdiscretetimesignalanalysis.】33、【多选题】Thetransformdomainanalysismethodsofdiscretetimesignalinclude:本题答案：【DTFT#ZT#DFT】34、【多选题】RegardingtherelationshipbetweenDTFTandztransform,whichofthefollowingstatementsarecorrect？本题答案：【DTFTisaspecialz-transform.#Thez-transformisageneralizedDTFT.#DTFTdoesnotnecessarilyexistinthesequencewhosez-transformexists.#Ifasequencehasaz-transformontheunitcircleofthez-plane,thenitsDTFTmustexist.】35、【多选题】本题答案：【FigureAsystemisanFIRsystem,andFigureBsystemisanIIRsystem.#FigureAandBsystemsarebothstablesystems.】36、【多选题】Regardinglinearconvolutionandcircularconvolution,whichofthefollowingstatementsarecorrect?本题答案：【Linearconvolutionandcircularconvolutionaredifferentincalculationmethods,sotheresultsobtainedaredifferent.#Undercertainconditions,theresultsoflinearconvolutionandcircularconvolutioncanbeequal.】37、【多选题】Thespecificationsusedtodescribedigitalfiltersare()本题答案：【Passbandedgefrequencyωp#Stopbandedgefrequencyωs#Passbandrippleδp#Stopbandrippleδs】38、【多选题】Accordingtothecharacteristicsofthelinearphasesystem,whichofthefollowingsystemsarelinearphasesystems？本题答案：【#】39、【多选题】TheimpulseresponseinvariantmethodandthebilineartransformationmethodaredifferentintheprocessofdesigningtheIIRfilter.Thedifferenceshowsin()本题答案：【Whencalculatingtheedgefrequencyoftheanalogprototypefilterbasedonthenormalizededgefrequency,thetwomethodsusedifferentformulas.#Whenmappinganalogprototypefilterstodigitalones,thedifferentmappingmethodsusedbythetwomethods.】40、【多选题】Accordingtobilineartransformationmethod,thecorrectoptionsinthefollowingstatementsare()本题答案：【Bilineartransformationintroducesaone-to-onemapping,asitsnameshows.#Althoughbilineartransformationhaslinearinit,itisactuallyanonlineartransformation.】41、【判断题】Analogsignalprocessingisnotasgoodasdigitalsignalprocessingintermsofaccuracy,stability,repeatabilityandreliability,soatpresentitcanbecompletelyreplacedbydigitalsignalprocessingandhasnovalueinexistence.本题答案：【错误】42、【判断题