数字信号处理（全英文）知到智慧树章节测试课后答案2024年秋山东科技大学

数字信号处理（全英文）知到智慧树章节测试课后答案2024年秋山东科技大学第一章单元测试

Microcontrollerscannotbeusedindigitalsignalprocessingsystems.（）

A:错B:对

答案:错Thedimensionofasignalisdeterminedbythenumberofdependentvariablesinthesignal.（）

A:错B:对

答案:错Asignalthatisgeneratedinarandomfashionandcannotbepredictedaheadoftimeiscalledadeterministicsignal.（）

A:对B:错

答案:错FIRDFisveryeasytoachieveexactlinearphase,whichisdifficultinanalogsystems.（）

A:错B:对

答案:对Thetechnologyforsignalprocessingwasalmostexclusivelycontinuous-timeanalogtechnologyuntil（）.

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

答案:1960sAccordingtothedifferentinputsignals,thesystemcanbedividedinto（）.

A:linearsystemB:AnalogSystemC:DigitalSystemD:Discrete-timeSystem

答案:AnalogSystem；DigitalSystem；Discrete-timeSystem

第二章单元测试

Adiscrete-timesignalisrepresentedasasequenceofnumberscalledsamples.（）

A:对B:错

答案:对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:错B:对

答案:错Asinusoidalsequenceisexpressedby,thusitsperiodis（）.

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

答案:12Frequenciesintheneighborhoodofarecalledlowfrequencies,whereas,frequenciesintheneighborhoodofarecalledhighfrequencies.（）

A:对B:错

答案:错Forthefollowingsystem,whichoneislinearsystem?（）

A:B:C:D:

答案:Theimpulseresponseh(n)istheoutputofaLTIsystemwithzerostatewhentheinputistheunitsamplesequenceδ(n).（）

A:错B:对

答案:对TocomputetheoutputofLTIsystemdescribedbydifferenceequation,themainmethodsinvolvein（）.

A:computationusingMATLABB:classicalsolutionfromtimedomainC:recursivesolutionfromtimedomainD:solutionfromtransformdomain

答案:computationusingMATLAB；classicalsolutionfromtimedomain；recursivesolutionfromtimedomain；solutionfromtransformdomainAdiscretetimesequencex(n)isdevelopedbyperiodicallysamplingananalogsignalxa(t)atuniformtimeintervals,thusthespectrumofdiscretetimesignalx(n)shouldbeperiodicextensionofthespectrumoftheoriginalanalogsignal.（）

A:错B:对

答案:对Intheprocessofconvertinganalogsignalstodigitalsignals,thehigherthesamplingfrequencyis,thebettertheprocessingperformanceofthesystemwillbe.（）

A:错B:对

答案:错Torecovertheoriginalcontinuoussignalfromthesampledsignalwithoutdistortion,Whichconditionsshouldbesatisfied?（）

Ⅰ.Theoriginalcontinuoussignalshouldbebandlimited；

Ⅱ.Thesamplingrateofsignalsshouldbegreaterthantwicethesignalbandwidth；

Ⅲ.Theideallowpassfiltershouldbeusedtoprocessthesampledsignal.

A:Ⅰ、Ⅱ、ⅢB:Ⅰ、ⅡC:Ⅰ、ⅢD:Ⅱ、Ⅲ

答案:Ⅰ、Ⅱ、Ⅲ

第三章单元测试

Thereisaone-to-onecorrespondencebetweenadiscretetimesignalanditsFouriertransform.（）

A:对B:错

答案:对Thespectrumofasequencecanbegraphedbymagnitudefrequencycharacteristicsandphasefrequencycharacteristics.（）

A:错B:对

答案:对TheDTFTofasequencyisaperiodicanddiscretefunctionof.（）

A:错B:对

答案:错If，then.（）

A:错B:对

答案:错Thebelowfigureisoneofthewaystocomputethelinearconvolutionofx(n)andh(n).WhichFouriertransformpropertydoesitfollow?（）

A:Frequency-DomainConvolutionTheoremB:Time-DomainConvolutionTheoremC:FrequencyShiftingTheoremD:TimeShiftingTheorem

答案:Time-DomainConvolutionTheoremForthefollowingsequencetypes,whoseFouriertransformisconjugate-symmetric?（）

A:animaginary-valuedsequenceB:aconjugate-symmetricsequenceC:acomplex-valuedsequenceD:areal-valuedsequence

答案:areal-valuedsequenceIftheDTFTofasequencyisexpressedas，thenisreferredtoas（）.

A:harmoniccomponentB:energyC:fundamentalcomponentD:directcurrentcomponent

答案:directcurrentcomponentAsforunderstandingonthedevelopmentandroleofFouriertransform，whicharecorrectforthefollowingstatements？（）

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

答案:FTrealizestheconversionofsignalsfromtimedomaintofrequencydomaintheoretically.；DFTprovidesamethodofapproximateestimationofsignalspectrumbydigitization.；FFTimprovestheefficiencyofDFTandmeettheneedsofreal-timeprocessinginengineeringpractice.；Allotheroptionsarecorrect.ForasequencewithaperiodofN,itsDFSisnotnecessarilyasequencewithaperiodofN.（）

A:对B:错

答案:错TheZ-transformtogetherwithitsROCdeterminesasequenceuniquely.（）

A:对B:错

答案:对Asforunderstandingonthephysicalmeaningoffrequencyresponse，whicharecorrectforthefollowingstatements？（）

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

答案:Themagnituderesponseshowsthathowthesystemaffectsamplitudeattenuationofeachfrequencycomponentintheinputsignal.；Thephaseresponseshowsthathowthesystemaffectstimedelayofeachfrequencycomponentintheinputsignal.；Foracomplexexponentialinputsignalwithsinglefrequency,theoutputofanLTIsystemisalsoacomplexexponentialsignalofthesamefrequency.Forthetransferfunctionofacausalandstablesystem,whicharecorrectforthefollowingstatements？（）

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

答案:Thecloserthepolelocationapproachestotheunitcircle,thegreaterthevalueofmagnitudefrequencyresponseofthesystemwillbe.；Ifthepoleislocatedontheunitcircle,thenthevalueofmagnitudefrequencyresponseofthesystemisequaltoinfinity.

第四章单元测试

Theprocesstoobtainafinite-lengthsequencebytruncatingaverylongsequenceisoftencalledthewindowing.（）

A:对B:错

答案:对TheN-pointDFTsequenceispreciselythesetoffrequencysamplesoftheFouriertransformofthelength-MsequenceatNequallyspacedfrequencies.（）

A:错B:对

答案:对Foragivenfinite-lengthsequence,itsperiodicextensioncanbeexpressedas（）.

A:NoneoftheotheroptionsarecorrectB:C:D:

答案:；；Circularconvolutioncanbeobtainedfromtakingtheperiodicextensionforlinearconvolutionfirst,andthentakingtheprincipal-valuerange.（）

A:错B:对

答案:对Inphysicalapplications,theimplementationoflinearconvolutionusingacircularconvolutionshouldinvolveinFFTalgorithms,whichiscalledfastconvolution.（）

A:对B:错

答案:对Forthefollowingsequencetypes,whoseDFTareconjugate-symmetric?（）

A:unitsamplesequenceB:unitstepsequenceC:sinusoidalsequenceD:rectangularsequence

答案:unitsamplesequence；unitstepsequence；sinusoidalsequence；rectangularsequenceFortheDTFTofalength-Msequence,WesampleatNequallyspacedpoints.IfNislessthenM,thenthetime-domainaliasingwilloccur.（）

A:错B:对

答案:对Inthefirststepofanalyzingacontinuous-timesignalusingtheDFT,selectionofthesamplingfrequencyshouldbehigherthantwotimesofthemaximumfrequency.（）

A:对B:错

答案:对Theimprovementmethodofthefrequencyresolutionistoincreasetheeffectivetime-recordlength.（）

A:错B:对

答案:对Zero-paddingoperationcanimprovetheabilityofthefrequencyresolution.（）

A:对B:错

答案:错Asforanalyzingthespectrumofacontinuous-timesignalusingtheDFT,theshorterthetruncatedsignalis,thesmallerthetruncationerrorwillbe.（）

A:对B:错

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

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

答案:fk=2fh×k/N

第五章单元测试

ThestraightforwardimplementationoftheDFTisofhigherefficiency,andFFTisnotnecessary.（）

A:错B:对

答案:错Tocomputethe256-pointDFTbymeansofdirectimplementation,weneed（）complexmultiplications.

A:128×8B:256×256C:256×255D:256

答案:256×256DFTistherealizationmethodofFourierTransformtheoretically.

（）

A:对B:错

答案:对FFTbecomesrealizationmethodofFourierTransformtheoretically.（）

A:对B:错

答案:错Onebutterflyoperationunitneeds（）.

A:1complexmultiplicationand1complexadditionsB:2complexmultiplicationand2complexadditionsC:2complexmultiplicationand1complexadditionsD:1complexmultiplicationand2complexadditions

答案:1complexmultiplicationand2complexadditionsTheformsofbasicbutterflyunitforDIT-FFTandDIF-FFTalgorithmsaredifferent.（）

A:对B:错

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

A:错B:对

答案:错N-PointFFTsoftworealsequencescanbeimplementedusingtheN-pointFFTofasinglecomplexsequence.（）

A:错B:对

答案:对IFFTalgorithmscanbeimplementedbythesmallchangesinFFTFlowGraph.（）

A:对B:错

答案:对IFFTalgorithmscanbeimplementedbyaddingpretreatmentandposttreatmentofFFT.（）

A:错B:对

答案:对

第六章单元测试

Theactualimplementationofadigitalfiltercouldbeeitherinsoftwareorhardware,dependingonpracticalapplications.（）

A:对B:错

答案:对Underfinite-precisionarithmetic,anygivenrealizationofadigitalfilterbehavesidenticallytoanyotherequivalentstructure.（）

A:对B:错

答案:错ForthecascadestructureofaIIRsystem,whichoneisnotitsadvantageinthefollowingoptions?（）

A:ErrorswillnotaccumulatestepbystepB:EachbasicsectionhasthesamestructureC:ConvenientadjustmentofpolesandzeroslocationD:Flexiblepairingofzeroandpolefactorsandswappingofcascadeorder

答案:ErrorswillnotaccumulatestepbystepInthecascadedorparallelstructuresofIIRfilters,thefirst-ordersectionandsecond-ordersectionaregenerallyusedassubsystems,whichareimplementedin（）.

A:parallelformB:linearphaseformC:directformD:cascadeform

答案:directformThesystemfunctionofFIRDFcanalsobeconsideredasanIIRDFwhosedenominatorpolynomialis1,andthefeedbackcoefficientsindirectformareequaltozero.（）

A:错B:对

答案:对Owingtosymmetryproperties,thefiltercanberealizedbylinearphasestructurethatcontainsmultipliersonlyaboutahalfoftheorderofthefilter.（）

A:错B:对

答案:对ForFIRdigitalfilters,thesignalflowgraphoflinearphaseformisindependentoftheevenoroddlengthNofimpulseresponseh(n).（）

A:对B:错

答案:错

第七章单元测试

AwidelyusedapproachtoIIRfilterdesignisbasedontheconversionofaprototypeanalogtransferfunctiontoadigitaltransferfunction.（）

A:对B:错

答案:对DigitalfiltersareveryimportantpartofDSP,whichhastwouses:signalseparationandsignalrestoration.（）

A:对B:错

答案:对Forapracticaldigitalfilter,themagnituderesponseinthepassbandandinthestopbandareofnoanyacceptabletolerances.（）

A:错B:对

答案:错Themagnitudefrequencycharacteristiccurveofadigitalfilterisshowninthebelowfigure,indicatingthatthefiltertypeis（）.

A:band-stopfilterB:low-passfilterC:high-passfilterD:band-passfilter

答案:high-passfilterFordigitalfilterdesign,normalizedbandedgefrequenciesneedtobecomputedfromspecificationsinHzusingtheformula.（）

A:对B:错

答案:对AsforthepropertiesoftheButterworthlow-passfiller,whicharecorrectforthefollowingstatements？（）

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

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

A:对B:错

答案:错BylookinguptheknowntableaccordingtotheorderN,wecanobtainthenormalizedtransferfunctionHa(p),whichisindependentto3dBcutofffrequencyΩc.（）

A:错B:对

答案:对AsfortheimpulseinvariancetransformationofIIRdigitalfilter,theanalogfrequenciesanddigitalfrequenciesarerelatedbylinearrelationship.（）

A:错B:对

答案:对Thealiasingdistortionisunavoidableintheimpulseinvariancetransformation.（）

A:错B:对

答案:对AsforthebilineartransformationofIIRdigitalfilter,itisamany-to-onemappingrelationshipfroms-planetoz-plane.（）

A:对B:错

答案:错AsforthebilineartransformationofIIRdigitalfilter,transformtransferfunctionHa(s)ofanalogfilterintotransferfunctionH(z)ofdigitalfilterbytheformula（）.

A:B:C:D:

答案:

第八章单元测试

AsforFIRdigitalfilterdesign,thestabilityisnotadesignissueasthetransferfunctionisapolynomialinz-1andisthusalwaysguaranteedstable.（）

A:错B:对

答案:对Forthefollowingoptions，whicharenotthedesignmethodforFIRdigitalfilters？（）

A:bilineartransformationB:designapproachbyWindowingC:impulseinvarianttransformationD:Frequencysampling

答案:bilineartransformation；impulseinvarianttransformationAsforType2Linear-PhaseFIRFilter,thefilterisnotsuitablefordesigningahigh-passandband-stopfilterowingtotheidentityequation.（）

A:对B:错

答案:对AsforType3Linear-PhaseFIRFilter,isantisymmetric,i.e.,andisnotnecessarilyequaltozero.（）

A:错B:对

答案:错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,anddoeslieon