數字信號處理（全英文）智慧樹知到課后章節答案2023年下山東科技大學山東科技大學

第一章測試

Microcontrollerscannotbeusedindigitalsignalprocessingsystems.（）

A:對B:錯

答案:錯

Thedimensionofasignalisdeterminedbythenumberofdependentvariablesinthesignal.（）

A:對B:錯

答案:錯

Asignalthatisgeneratedinarandomfashionandcannotbepredictedaheadoftimeiscalledadeterministicsignal.（）

A:錯B:對

答案:錯

FIRDFisveryeasytoachieveexactlinearphase,whichisdifficultinanalogsystems.（）

A:錯B:對

答案:對

Thetechnologyforsignalprocessingwasalmostexclusivelycontinuous-timeanalogtechnologyuntil（）.

A:1980sB:1960sC:1970sD:1950s

答案:1960s

Accordingtothedifferentinputsignals,thesystemcanbedividedinto（）.

A:DigitalSystemB:AnalogSystemC:Discrete-timeSystemD:linearsystem

答案:DigitalSystem;AnalogSystem;Discrete-timeSystem

第二章測試

Adiscrete-timesignalisrepresentedasasequenceofnumberscalledsamples.（）

A:對B:錯

答案:對

Shiftsequencex(n)totherightbymsamples,form>0,resultinginanewsequence（）.

A:x(n-m)B:x(-n-m)C:x(-n+m)D:x(n+m)

答案:x(n-m)

Real-ValuedExponentialSequenceanu(n)mustdecayexponentiallyasnincreases.（）

A:對B:錯

答案:錯

Asinusoidalsequenceisexpressedby,thusitsperiodis（）.

A:6B:11C:12D:12/11

答案:12

Frequenciesintheneighborhoodofarecalledlowfrequencies,whereas,frequenciesintheneighborhoodofarecalledhighfrequencies.（）

A:錯B:對

答案:錯

Forthefollowingsystem,whichoneislinearsystem?（）

A:B:C:D:

答案:

Theimpulseresponseh(n)istheoutputofaLTIsystemwithzerostatewhentheinputistheunitsamplesequenceδ(n).（）

A:錯B:對

答案:對

TocomputetheoutputofLTIsystemdescribedbydifferenceequation,themainmethodsinvolvein（）.

A:computationusingMATLABB:classicalsolutionfromtimedomainC:solutionfromtransformdomainD:recursivesolutionfromtimedomain

答案:computationusingMATLAB;classicalsolutionfromtimedomain;solutionfromtransformdomain;recursivesolutionfromtimedomain

Adiscretetimesequencex(n)isdevelopedbyperiodicallysamplingananalogsignalxa(t)atuniformtimeintervals,thusthespectrumofdiscretetimesignalx(n)shouldbeperiodicextensionofthespectrumoftheoriginalanalogsignal.（）

A:錯B:對

答案:對

Intheprocessofconvertinganalogsignalstodigitalsignals,thehigherthesamplingfrequencyis,thebettertheprocessingperformanceofthesystemwillbe.（）

A:對B:錯

答案:錯

Torecovertheoriginalcontinuoussignalfromthesampledsignalwithoutdistortion,Whichconditionsshouldbesatisfied?（）

Ⅰ.Theoriginalcontinuoussignalshouldbebandlimited；

Ⅱ.Thesamplingrateofsignalsshouldbegreaterthantwicethesignalbandwidth；

Ⅲ.Theideallowpassfiltershouldbeusedtoprocessthesampledsignal.

A:Ⅰ、Ⅱ、ⅢB:Ⅱ、ⅢC:Ⅰ、ⅡD:Ⅰ、Ⅲ

答案:Ⅰ、Ⅱ、Ⅲ

第三章測試

Thereisaone-to-onecorrespondencebetweenadiscretetimesignalanditsFouriertransform.（）

A:對B:錯

答案:對

Thespectrumofasequencecanbegraphedbymagnitudefrequencycharacteristicsandphasefrequencycharacteristics.（）

A:錯B:對

答案:對

TheDTFTofasequencyisaperiodicanddiscretefunctionof.（）

A:錯B:對

答案:錯

If，then.（）

A:錯B:對

答案:錯

Thebelowfigureisoneofthewaystocomputethelinearconvolutionofx(n)andh(n).WhichFouriertransformpropertydoesitfollow?（）

A:TimeShiftingTheoremB:Time-DomainConvolutionTheoremC:FrequencyShiftingTheoremD:Frequency-DomainConvolutionTheorem

答案:Time-DomainConvolutionTheorem

Forthefollowingsequencetypes,whoseFouriertransformisconjugate-symmetric?（）

A:areal-valuedsequenceB:animaginary-valuedsequenceC:acomplex-valuedsequenceD:aconjugate-symmetricsequence

答案:areal-valuedsequence

IftheDTFTofasequencyisexpressedas，thenisreferredtoas（）.

A:fundamentalcomponentB:harmoniccomponentC:directcurrentcomponentD:energy

答案:directcurrentcomponent

AsforunderstandingonthedevelopmentandroleofFouriertransform，whicharecorrectforthefollowingstatements？（）

A:FFTimprovestheefficiencyofDFTandmeettheneedsofreal-timeprocessinginengineeringpractice.B:Allotheroptionsarecorrect.C:DFTprovidesamethodofapproximateestimationofsignalspectrumbydigitization.D:FTrealizestheconversionofsignalsfromtimedomaintofrequencydomaintheoretically.

答案:FFTimprovestheefficiencyofDFTandmeettheneedsofreal-timeprocessinginengineeringpractice.;Allotheroptionsarecorrect.;DFTprovidesamethodofapproximateestimationofsignalspectrumbydigitization.;FTrealizestheconversionofsignalsfromtimedomaintofrequencydomaintheoretically.

ForasequencewithaperiodofN,itsDFSisnotnecessarilyasequencewithaperiodofN.（）

A:對B:錯

答案:錯

TheZ-transformtogetherwithitsROCdeterminesasequenceuniquely.（）

A:錯B:對

答案:對

Asforunderstandingonthephysicalmeaningoffrequencyresponse，whicharecorrectforthefollowingstatements？（）

A:Themagnituderesponseshowsthathowthesystemaffectsamplitudeattenuationofeachfrequencycomponentintheinputsignal.B:Thephaseresponseshowsthathowthesystemaffectstimedelayofeachfrequencycomponentintheinputsignal.C:Foracomplexexponentialinputsignalwithsinglefrequency,theoutputofanLTIsystemisalsoacomplexexponentialsignalofthesamefrequency.D:Foracomplexexponentialinputsignalwithsinglefrequency,theoutputofanLTIsystemisacomplexexponentialsignalofthedifferentfrequency.

答案:Themagnituderesponseshowsthathowthesystemaffectsamplitudeattenuationofeachfrequencycomponentintheinputsignal.;Thephaseresponseshowsthathowthesystemaffectstimedelayofeachfrequencycomponentintheinputsignal.;Foracomplexexponentialinputsignalwithsinglefrequency,theoutputofanLTIsystemisalsoacomplexexponentialsignalofthesamefrequency.

Forthetransferfunctionofacausalandstablesystem,whicharecorrectforthefollowingstatements？（）

A:Ifthepoleislocatedontheunitcircle,thenthevalueofmagnitudefrequencyresponseofthesystemisequaltoinfinity.B:Thecloserthepolelocationapproachestotheunitcircle,thegreaterthevalueofmagnitudefrequencyresponseofthesystemwillbe.C:Thecloserthepolelocationapproachestotheunitcircle,thesmallerthevalueofmagnitudefrequencyresponseofthesystemwillbe.D:Ifthepoleislocatedontheunitcircle,thenthevalueofmagnitudefrequencyresponseofthesystemisequaltozero.

答案:Ifthepoleislocatedontheunitcircle,thenthevalueofmagnitudefrequencyresponseofthesystemisequaltoinfinity.;Thecloserthepolelocationapproachestotheunitcircle,thegreaterthevalueofmagnitudefrequencyresponseofthesystemwillbe.

第四章測試

Theprocesstoobtainafinite-lengthsequencebytruncatingaverylongsequenceisoftencalledthewindowing.（）

A:對B:錯

答案:對

TheN-pointDFTsequenceispreciselythesetoffrequencysamplesoftheFouriertransformofthelength-MsequenceatNequallyspacedfrequencies.（）

A:錯B:對

答案:對

Foragivenfinite-lengthsequence,itsperiodicextensioncanbeexpressedas（）.

A:B:C:NoneoftheotheroptionsarecorrectD:

答案:;;

Circularconvolutioncanbeobtainedfromtakingtheperiodicextensionforlinearconvolutionfirst,andthentakingtheprincipal-valuerange.（）

A:錯B:對

答案:對

Inphysicalapplications,theimplementationoflinearconvolutionusingacircularconvolutionshouldinvolveinFFTalgorithms,whichiscalledfastconvolution.（）

A:錯B:對

答案:對

Forthefollowingsequencetypes,whoseDFTareconjugate-symmetric?（）

A:unitsamplesequenceB:sinusoidalsequenceC:rectangularsequenceD:unitstepsequence

答案:unitsamplesequence;sinusoidalsequence;rectangularsequence;unitstepsequence

FortheDTFTofalength-Msequence,WesampleatNequallyspacedpoints.IfNislessthenM,thenthetime-domainaliasingwilloccur.（）

A:錯B:對

答案:對

Inthefirststepofanalyzingacontinuous-timesignalusingtheDFT,selectionofthesamplingfrequencyshouldbehigherthantwotimesofthemaximumfrequency.（）

A:錯B:對

答案:對

Theimprovementmethodofthefrequencyresolutionistoincreasetheeffectivetime-recordlength.（）

A:對B:錯

答案:對

Zero-paddingoperationcanimprovetheabilityofthefrequencyresolution.（）

A:對B:錯

答案:錯

Asforanalyzingthespectrumofacontinuous-timesignalusingtheDFT,theshorterthetruncatedsignalis,thesmallerthetruncationerrorwillbe.（）

A:錯B:對

答案:錯

Asforanalyzingthespectrumofacontinuous-timesignalusingtheDFT,someparametersaregivenhere,includingthehighestfrequencyfhofsignal,thesamplingfrequencyFs,andthetransformintervallengthNofDFT.Theexactanalogfrequencyfkcorrespondingtothefrequencyindexk,canbedeterminedusingtheformula（）.

A:fk=Fs×k/NB:fk=2fh×k/NC:fk=fh×k/ND:fk=2Fs×k/N

答案:fk=2fh×k/N

第五章測試

ThestraightforwardimplementationoftheDFTisofhigherefficiency,andFFTisnotnecessary.（）

A:對B:錯

答案:錯

Tocomputethe256-pointDFTbymeansofdirectimplementation,weneed（）complexmultiplications.

A:256×256B:256×255C:256D:128×8

答案:256×256

DFTistherealizationmethodofFourierTransformtheoretically.

（）

A:對B:錯

答案:對

FFTbecomesrealizationmethodofFourierTransformtheoretically.（）

A:對B:錯

答案:錯

Onebutterflyoperationunitneeds（）.

A:2complexmultiplicationand2complexadditionsB:2complexmultiplicationand1complexadditionsC:1complexmultiplicationand2complexadditionsD:1complexmultiplicationand1complexadditions

答案:1complexmultiplicationand2complexadditions

TheformsofbasicbutterflyunitforDIT-FFTandDIF-FFTalgorithmsaredifferent.（）

A:錯B:對

答案:對

FortheDIF-FFTalgorithmwithradix-2,theinputinthecompleteflowgraphisofbit-reverseddecimalindex,andtheoutputisofnormal-orderdecimalindex.（）

A:對B:錯

答案:錯

N-PointFFTsoftworealsequencescanbeimplementedusingtheN-pointFFTofasinglecomplexsequence.（）

A:對B:錯

答案:對

IFFTalgorithmscanbeimplementedbythesmallchangesinFFTFlowGraph.（）

A:錯B:對

答案:對

IFFTalgorithmscanbeimplementedbyaddingpretreatmentandposttreatmentofFFT.（）

A:錯B:對

答案:對

第六章測試

Theactualimplementationofadigitalfiltercouldbeeitherinsoftwareorhardware,dependingonpracticalapplications.（）

A:錯B:對

答案:對

Underfinite-precisionarithmetic,anygivenrealizationofadigitalfilterbehavesidenticallytoanyotherequivalentstructure.（）

A:對B:錯

答案:錯

ForthecascadestructureofaIIRsystem,whichoneisnotitsadvantageinthefollowingoptions?（）

A:ConvenientadjustmentofpolesandzeroslocationB:ErrorswillnotaccumulatestepbystepC:FlexiblepairingofzeroandpolefactorsandswappingofcascadeorderD:Eachbasicsectionhasthesamestructure

答案:Errorswillnotaccumulatestepbystep

InthecascadedorparallelstructuresofIIRfilters,thefirst-ordersectionandsecond-ordersectionaregenerallyusedassubsystems,whichareimplementedin（）.

A:parallelformB:linearphaseformC:cascadeformD:directform

答案:directform

ThesystemfunctionofFIRDFcanalsobeconsideredasanIIRDFwhosedenominatorpolynomialis1,andthefeedbackcoefficientsindirectformareequaltozero.（）

A:對B:錯

答案:對

Owingtosymmetryproperties,thefiltercanberealizedbylinearphasestructurethatcontainsmultipliersonlyaboutahalfoftheorderofthefilter.（）

A:對B:錯

答案:對

ForFIRdigitalfilters,thesignalflowgraphoflinearphaseformisindependentoftheevenoroddlengthNofimpulseresponseh(n).（）

A:錯B:對

答案:錯

第七章測試

AwidelyusedapproachtoIIRfilterdesignisbasedontheconversionofaprototypeanalogtransferfunctiontoadigitaltransferfunction.（）

A:對B:錯

答案:對

DigitalfiltersareveryimportantpartofDSP,whichhastwouses:signalseparationandsignalrestoration.（）

A:錯B:對

答案:對

Forapracticaldigitalfilter,themagnituderesponseinthepassbandandinthestopbandareofnoanyacceptabletolerances.（）

A:對B:錯

答案:錯

Themagnitudefrequencycharacteristiccurveofadigitalfilterisshowninthebelowfigure,indicatingthatthefiltertypeis（）.

A:high-passfilterB:band-stopfilterC:band-passfilterD:low-passfilter

答案:high-passfilter

Fordigitalfilterdesign,normalizedbandedgefrequenciesneedtobecomputedfromspecificationsinHzusingtheformula.（）

A:對B:錯

答案:對

AsforthepropertiesoftheButterworthlow-passfiller,whicharecorrectforthefollowingstatements？（）

A:Asthefilterorderincreases,thecharacteristicsbecomesharper.B:Themagnituderesponseisamonotonicallydecreasing.C:TheDCgainofthefilterisunityforanyorderD:The3-dBbandwidthisunrelatedtothefilterorder.

答案:Asthefilterorderincreases,thecharacteristicsbecomesharper.;Themagnituderesponseisamonotonicallydecreasing.;TheDCgainofthefilterisunityforanyorder;The3-dBbandwidthisunrelatedtothefilterorder.

ThemagnitudefrequencyresponseofChebyshevfiltersisofequiripplecharacteristicsinboththepassbandandstopband.（）

A:對B:錯

答案:錯

BylookinguptheknowntableaccordingtotheorderN,wecanobtainthenormalizedtransferfunctionHa(p),whichisindependentto3dBcutofffrequencyΩc.（）

A:對B:錯

答案:對

AsfortheimpulseinvariancetransformationofIIRdigitalfilter,theanalogfrequenciesanddigitalfrequenciesarerelatedbylinearrelationship.（）

A:錯B:對

答案:對

Thealiasingdistortionisunavoidableintheimpulseinvariancetransformation.（）

A:錯B:對

答案:對

AsforthebilineartransformationofIIRdigitalfilter,itisamany-to-onemappingrelationshipfroms-planetoz-plane.（）

A:錯B:對

答案:錯

AsforthebilineartransformationofIIRdigitalfilter,transformtransferfunctionHa(s)ofanalogfilterintotransferfunctionH(z)ofdigitalfilterbytheformula（）.

A:B:C:D:

答案:

第八章測試

AsforFIRdigitalfilterdesign,thestabilityisnotadesignissueasthetransferfunctionisapolynomialinz-1andisthusalwaysguaranteedstable.（）

A:錯B:對

答案:對

Forthefollowingoptions，whicharenotthedesignmethodforFIRdigitalfilters？（）

A:FrequencysamplingB:impulseinvarianttransformationC:bilineartransformationD:designapproachbyWindowing

答案:impulseinvarianttransformation;bilineartransformation

AsforType2Linear-PhaseFIRFilter,thefilterisnotsuitablefordesigningahigh-passandband-stopfilterowingtotheidentityequation.（）

A:對B:錯

答案:對

AsforType3Linear-PhaseFIRFilter,isantisymmetric,i.e.,andisnotnecessarilyequaltozero.（）

A:對B:錯

答案:錯

AsforconstraintsonzerolocationsforLinear-PhaseFIRFilter,whicharecorrectforthefollowingstatements?（）

A:Zerosmustbeonecomplex-conjugatepairofzerosstandingontheunitcircle,whenzerosdonotlieonreal-axis,anddoeslieontheunitcircle.B:Zerosmustbetworealzerosexhibitmirror-imagesymmetrywithrespecttotheunitcircle,whenzerosdolieonreal-axis,anddonotlieontheunitcircle.C:Zerosmustbetwocomplex-conjugatepairsthatarereciprocaltoeachother,whenzerosdonotlieontheunitcircle,anddonotlieonreal-axis.D:Asinglezeroiseither1or-1,whenzerosdonotonlylieontheunitcircle,butalsoontherealaxis.

答案:Zerosmustbeonecomplex-conjugatepairofzerosstandingontheunitcircle,whenzerosdonotlieonreal-axis,anddoeslie