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数字信号处理(全英文)智慧树知到课后章节答案2023年下山东科技大学山东科技大学
第一章测试
Microcontrollerscannotbeusedindigitalsignalprocessingsystems.()
A:对B:错
答案:错
Thedimensionofasignalisdeterminedbythenumberofdependentvariablesinthesignal.()
A:对B:错
答案:错
Asignalthatisgeneratedinarandomfashionandcannotbepredictedaheadoftimeiscalledadeterministicsignal.()
A:错B:对
答案:错
FIRDFisveryeasytoachieveexactlinearphase,whichisdifficultinanalogsystems.()
A:错B:对
答案:对
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:对B:错
答案:错
Asinusoidalsequenceisexpressedby,thusitsperiodis().
A:6B:11C:12D:12/11
答案:12
Frequenciesintheneighborhoodofarecalledlowfrequencies,whereas,frequenciesintheneighborhoodofarecalledhighfrequencies.()
A:错B:对
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:solutionfromtransformdomainD:recursivesolutionfromtimedomain
答案:computationusingMATLAB;classicalsolutionfromtimedomain;solutionfromtransformdomain;recursivesolutionfromtimedomain
Adiscretetimesequencex(n)isdevelopedbyperiodicallysamplingananalogsignalxa(t)atuniformtimeintervals,thusthespectrumofdiscretetimesignalx(n)shouldbeperiodicextensionofthespectrumoftheoriginalanalogsignal.()
A:错B:对
答案:对
Intheprocessofconvertinganalogsignalstodigitalsignals,thehigherthesamplingfrequencyis,thebettertheprocessingperformanceofthesystemwillbe.()
A:对B:错
答案:错
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: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:对B:错
答案:错
TheZ-transformtogetherwithitsROCdeterminesasequenceuniquely.()
A:错B:对
答案:对
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:B:C:NoneoftheotheroptionsarecorrectD:
答案:;;
Circularconvolutioncanbeobtainedfromtakingtheperiodicextensionforlinearconvolutionfirst,andthentakingtheprincipal-valuerange.()
A:错B:对
答案:对
Inphysicalapplications,theimplementationoflinearconvolutionusingacircularconvolutionshouldinvolveinFFTalgorithms,whichiscalledfastconvolution.()
A:错B:对
答案:对
Forthefollowingsequencetypes,whoseDFTareconjugate-symmetric?()
A:unitsamplesequenceB:sinusoidalsequenceC:rectangularsequenceD:unitstepsequence
答案:unitsamplesequence;sinusoidalsequence;rectangularsequence;unitstepsequence
FortheDTFTofalength-Msequence,WesampleatNequallyspacedpoints.IfNislessthenM,thenthetime-domainaliasingwilloccur.()
A:错B:对
答案:对
Inthefirststepofanalyzingacontinuous-timesignalusingtheDFT,selectionofthesamplingfrequencyshouldbehigherthantwotimesofthemaximumfrequency.()
A:错B:对
答案:对
Theimprovementmethodofthefrequencyresolutionistoincreasetheeffectivetime-recordlength.()
A:对B:错
答案:对
Zero-paddingoperationcanimprovetheabilityofthefrequencyresolution.()
A:对B:错
答案:错
Asforanalyzingthespectrumofacontinuous-timesignalusingtheDFT,theshorterthetruncatedsignalis,thesmallerthetruncationerrorwillbe.()
A:错B:对
答案:错
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
第五章测试
ThestraightforwardimplementationoftheDFTisofhigherefficiency,andFFTisnotnecessary.()
A:对B:错
答案:错
Tocomputethe256-pointDFTbymeansofdirectimplementation,weneed()complexmultiplications.
A:256×256B:256×255C:256D:128×8
答案:256×256
DFTistherealizationmethodofFourierTransformtheoretically.
()
A:对B:错
答案:对
FFTbecomesrealizationmethodofFourierTransformtheoretically.()
A:对B:错
答案:错
Onebutterflyoperationunitneeds().
A:2complexmultiplicationand2complexadditionsB:2complexmultiplicationand1complexadditionsC:1complexmultiplicationand2complexadditionsD:1complexmultiplicationand1complexadditions
答案:1complexmultiplicationand2complexadditions
TheformsofbasicbutterflyunitforDIT-FFTandDIF-FFTalgorithmsaredifferent.()
A:错B:对
答案:对
FortheDIF-FFTalgorithmwithradix-2,theinputinthecompleteflowgraphisofbit-reverseddecimalindex,andtheoutputisofnormal-orderdecimalindex.()
A:对B:错
答案:错
N-PointFFTsoftworealsequencescanbeimplementedusingtheN-pointFFTofasinglecomplexsequence.()
A:对B:错
答案:对
IFFTalgorithmscanbeimplementedbythesmallchangesinFFTFlowGraph.()
A:错B:对
答案:对
IFFTalgorithmscanbeimplementedbyaddingpretreatmentandposttreatmentofFFT.()
A:错B:对
答案:对
第六章测试
Theactualimplementationofadigitalfiltercouldbeeitherinsoftwareorhardware,dependingonpracticalapplications.()
A:错B:对
答案:对
Underfinite-precisionarithmetic,anygivenrealizationofadigitalfilterbehavesidenticallytoanyotherequivalentstructure.()
A:对B:错
答案:错
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:对B:错
答案:对
Owingtosymmetryproperties,thefiltercanberealizedbylinearphasestructurethatcontainsmultipliersonlyaboutahalfoftheorderofthefilter.()
A:对B:错
答案:对
ForFIRdigitalfilters,thesignalflowgraphoflinearphaseformisindependentoftheevenoroddlengthNofimpulseresponseh(n).()
A:错B:对
答案:错
第七章测试
AwidelyusedapproachtoIIRfilterdesignisbasedontheconversionofaprototypeanalogtransferfunctiontoadigitaltransferfunction.()
A:对B:错
答案:对
DigitalfiltersareveryimportantpartofDSP,whichhastwouses:signalseparationandsignalrestoration.()
A:错B:对
答案:对
Forapracticaldigitalfilter,themagnituderesponseinthepassbandandinthestopbandareofnoanyacceptabletolerances.()
A:对B:错
答案:错
Themagnitudefrequencycharacteristiccurveofadigitalfilterisshowninthebelowfigure,indicatingthatthefiltertypeis().
A:high-passfilterB:band-stopfilterC:band-passfilterD:low-passfilter
答案:high-passfilter
Fordigitalfilterdesign,normalizedbandedgefrequenciesneedtobecomputedfromspecificationsinHzusingtheformula.()
A:对B:错
答案:对
AsforthepropertiesoftheButterworthlow-passfiller,whicharecorrectforthefollowingstatements?()
A:Asthefilterorderincreases,thecharacteristicsbecomesharper.B:Themagnituderesponseisamonotonicallydecreasing.C:TheDCgainofthefilterisunityforanyorderD:The3-dBbandwidthisunrelatedtothefilterorder.
答案:Asthefilterorderincreases,thecharacteristicsbecomesharper.;Themagnituderesponseisamonotonicallydecreasing.;TheDCgainofthefilterisunityforanyorder;The3-dBbandwidthisunrelatedtothefilterorder.
ThemagnitudefrequencyresponseofChebyshevfiltersisofequiripplecharacteristicsinboththepassbandandstopband.()
A:对B:错
答案:错
BylookinguptheknowntableaccordingtotheorderN,wecanobtainthenormalizedtransferfunctionHa(p),whichisindependentto3dBcutofffrequencyΩc.()
A:对B:错
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:错B:对
答案:错
AsforthebilineartransformationofIIRdigitalfilter,transformtransferfunctionHa(s)ofanalogfilterintotransferfunctionH(z)ofdigitalfilterbytheformula().
A:B:C:D:
答案:
第八章测试
AsforFIRdigitalfilterdesign,thestabilityisnotadesignissueasthetransferfunctionisapolynomialinz-1andisthusalwaysguaranteedstable.()
A:错B:对
答案:对
Forthefollowingoptions,whicharenotthedesignmethodforFIRdigitalfilters?()
A:FrequencysamplingB:impulseinvarianttransformationC:bilineartransformationD:designapproachbyWindowing
答案:impulseinvarianttransformation;bilineartransformation
AsforType2Linear-PhaseFIRFilter,thefilterisnotsuitablefordesigningahigh-passandband-stopfilterowingtotheidentityequation.()
A:对B:错
答案:对
AsforType3Linear-PhaseFIRFilter,isantisymmetric,i.e.,andisnotnecessarilyequaltozero.()
A:对B:错
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,anddoeslie
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