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數字信號處理(英文)知到智慧樹章節測試課后答案2024年秋西北工業大學模塊一單元測試
Prerequisitesofthiscourseinclude:()
A:CalculusB:SignalsandSystemsC:ComplexVariablesD:Painting
答案:Calculus;SignalsandSystems;ComplexVariablesIfyoumeasureandrecordyourweighteveryday,thatisadigitalsignal.()
A:對B:錯
答案:對Whataretheadvantagesofdigitalsignalprocessing:()
A:PopularityofdigitaldevicesB:EasytoimplementbyVLSIC:ReliableandaccurateD:Flexibleandprogrammable
答案:Popularityofdigitaldevices;EasytoimplementbyVLSI;Reliableandaccurate;FlexibleandprogrammableDigitalsignalprocessingissomethingnewanddoesnothavealongandrichhistory.()
A:錯B:對
答案:錯Aspeechsignalaswellasadigitalimagearetypicallyin1D.()
A:對B:錯
答案:錯
模塊二單元測試
IfanLTIsystemhasanimpulseresponsewithfinitesamplevalues,anditisFIR,thenitisastablesystem.()
A:對B:錯
答案:對IfanLTIsystemhasanimpulseresponsewithfinitesamplevalues,anditisIIR,itisanunstablesystem.()
A:對B:錯
答案:錯GivenaSinusoidalsequence.Whichofthefollowingisitsperiod?()
A:NoperiodB:8C:16D:4
答案:NoperiodConvolutionsumisusefulforcomputationoftheoutputifthesystemis()。
A:linearB:linear&timeInvariantC:stableD:timeinvariant
答案:linear&timeInvariantIfthesequenceisoflengthLandtheimpulseresponseofanLTIsystemisoflengthP.Whatwillbethelengthaftertheirconvolution?()
A:L+P-1B:PC:LD:L+P
答案:L+P-1
模塊三單元測試
TheFouriertransformofanaperiodicsequenceis()
A:PeriodicB:ContinuousC:AperiodicD:Discrete
答案:Periodic;ContinuousTheeigenfunctionofanLTIsystemisthe()
A:complexexponentialsequenceB:unitstepsequenceC:sinusoidalsequenceD:realexponentialsequence
答案:complexexponentialsequenceWhichofthefollowingisthecorrectformulaforDTFT?()
A:B:C:D:
答案:Whichofthefollowingis/arecorrespondingtoalowfrequency?()
A:B:C:0D:
答案:;TheDTFTofis()
A:B:0C:D:1
答案:1
模塊四單元測試
Thisisthezero-poleplotofanLTIsystemonthez-plane.Itcanbe:()
A:NotcausalandnotstableB:NotcausalbutstableC:CausalandstableD:Causalbutnotstable
答案:Notcausalandnotstable;Notcausalbutstable;CausalbutnotstableWhichofthefollowingstatementistrue?()
A:AnysequencehasitsFouriertransformB:AstablesystemhasitsFouriertransformC:AncausalsystemhasitsFouriertransformD:Ifasequencehasz-transform,ithasFouriertransform
答案:AstablesystemhasitsFouriertransformForanFIRsystem,it’sROCofz-transformis()
A:InaringregiondeterminedbytwopolesB:Theentirez-planeexceptfor0orinfinityC:InsideacircledeterminedbytheinnermostpoleD:Outsideacircledeterminedbytheoutmostpole
答案:Theentirez-planeexceptfor0orinfinitySupposewehaveanLTIsystem,anditsinputisanimpulsesequence.Whatarethenamefortheoutputanditsz-transform?()
A:impulseinvarianceandsystemfunctionB:impulseinvarianceandfrequencyresponseC:impulseresponseandsystemfunctionD:impulseresponseandfrequencyresponse
答案:impulseresponseandsystemfunctionGivenwiththeROC,itscorrespondingsequenceshouldbe()
A:B:C:D:
答案:
模塊五單元測試
()
A:-1B:1C:0D:N
答案:1()
A:-1B:0C:ND:1
答案:1()
A:0B:NC:-1D:1
答案:-1()
A:錯B:對
答案:對DFSisperiodic.()
A:對B:錯
答案:對
模塊六單元測試
Whichofthefollowingshouldhaveduality?()
A:FouriertransformB:DFTC:DFSD:ztransform
答案:DFT;DFSTherearetwosignalswithlengthN1andN2,respectively.IfwewishtofindouttheirlinearconvolutionthroughM-pointDFT,whichofthefollowingMcanbeapplied?()
A:max(N1,N2)B:min(N1,N2)C:N1orN2D:N1+N2
答案:N1+N2IfthereisamodulewhichcanfindouttheoutputofanLTIsystemusingDFT,whichofthefollowingstatementis/aretrue?()
A:Theinputsignalofthesystemshouldbefiniteinlength.B:TheLTIsystemshouldbeFIR.C:TheLTIsystemshouldbeIIR.D:Theinputsignalofthesystemshouldbeperiodic.
答案:Theinputsignalofthesystemshouldbefiniteinlength.;TheLTIsystemshouldbeFIR.DFTis,inessence,periodicastheDFS,sinceitcorrespondstosamplingtheFouriertransform.IndefiningtheDFTrepresentation,wearesimplyrecognizingthatweareinterestedinthevaluesinoneperiod.()
A:對B:錯
答案:對.()
A:錯B:對
答案:對
模塊七單元測試
Whatistheorderofcomputationalcomplexityfor16-pointDFTinit'sdirectcomputation?()
A:64B:256C:128D:16
答案:256Whatistheorderofcomputationalcomplexityfor16-pointDFTinit'sFFTcomputation?()
A:128B:16C:64D:256
答案:64WhatarethemajortwotypesofFFTcomputation?()
A:DFSB:DIFC:DFTD:DIT
答案:DIF;DITWhatistheorderofinputsequenceforDIT-FFT?()
A:Bit-reversedB:RandomC:ReverseD:Sequential
答案:Bit-reversedWhatistheorderofoutputsequenceforDIF-FFT?()
A:SequentialB:RandomC:ReverseD:Bit-reversed
答案:Bit-reversed
模塊八單元測試
Inapracticalsystem,thereisananti-aliasingfilterbeforeA/Dconverter.Suchafiltershouldbe:()
A:bandpassB:highpassC:bandstopD:lowpass
答案:lowpassInC/Dconverter,theinputsignaliscontinuousanditwillbesampled.Astheresult,theoutputsignalisdigital.()
A:對B:錯
答案:錯Ifwewishtorecoveracontinuoussignalfromitssamples,whatkindoffiltershallweuse,ideally?()
A:lowpassB:bandstopC:bandpassD:highpass
答案:lowpassStatistically,thevarianceofthequantizationerrorcanbedescribedusingthequantizationstepas:()
A:B:0C:D:
答案:Statistically,themeanofthequantizationerrorcanbedescribedusingthequantizationstepas:()
A:B:0C:D:
答案:0
模塊九單元測試
Giventhesystemfunctionof,wecanconcludethat()
A:WhetherthissystemisIIRorFIRisnotsureB:ThissystemisFIRC:ThissystemisIIRD:ItisbothIIRandFIR
答案:ThissystemisIIRGiventhesystemfunctionof,wecanconcludethat()
A:ThissystemisIIRB:WhetherthissystemisIIRorFIRisnotsureC:ThissystemisFIRD:ItisbothIIRandFIR
答案:ThissystemisFIRWhichofthefollowingsystemsis/areIIR?()
A:FB:CC:BD:AE:DF:E
答案:C;B;D;EWhichofthefollowingcausalsystemsis/arestable?()
A:EB:FC:CD:DE:BF:A
答案:E;F;C;B;AThefollowingsystemis
()
A:linearphaseB:nonlinearphaseC:FIRD:IIR
答案:linearphase;FIR
模塊十單元測試
Thefollowingsystemis()
A:anIIRlowpassfilterB:anFIRlowpassfilterC:anFIRhighpassfilterD:anIIRhighpassfilter
答案:anFIRlowpassfilterConsideringFIRfilterdesignusingwindowingmethod.Thewidthofthetransitionbandisapproximatelythesameas:()
A:sidelobewidthB:sidelobeamplitudeC:mainlobewidthD:mainlobeamplitudeE:windowsizeF:windowwidth
答案:mainlobewidthTodesignaband-stopfilter,youwouldchoose:()
A:FIRfilterdesignthroughwindowingwiththewindowsizeanevennumber.B:IIRfilter
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