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數(shù)字信號處理(英文)知到智慧樹章節(jié)測試課后答案2024年秋西北工業(yè)大學(xué)模塊一單元測試

Prerequisitesofthiscourseinclude:()

A:CalculusB:SignalsandSystemsC:ComplexVariablesD:Painting

答案:Calculus;SignalsandSystems;ComplexVariablesIfyoumeasureandrecordyourweighteveryday,thatisadigitalsignal.()

A:對B:錯(cuò)

答案:對Whataretheadvantagesofdigitalsignalprocessing:()

A:PopularityofdigitaldevicesB:EasytoimplementbyVLSIC:ReliableandaccurateD:Flexibleandprogrammable

答案:Popularityofdigitaldevices;EasytoimplementbyVLSI;Reliableandaccurate;FlexibleandprogrammableDigitalsignalprocessingissomethingnewanddoesnothavealongandrichhistory.()

A:錯(cuò)B:對

答案:錯(cuò)Aspeechsignalaswellasadigitalimagearetypicallyin1D.()

A:對B:錯(cuò)

答案:錯(cuò)

模塊二單元測試

IfanLTIsystemhasanimpulseresponsewithfinitesamplevalues,anditisFIR,thenitisastablesystem.()

A:對B:錯(cuò)

答案:對IfanLTIsystemhasanimpulseresponsewithfinitesamplevalues,anditisIIR,itisanunstablesystem.()

A:對B:錯(cuò)

答案:錯(cuò)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(cuò)B:對

答案:對DFSisperiodic.()

A:對B:錯(cuò)

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(cuò)

答案:對.()

A:錯(cuò)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(cuò)

答案:錯(cuò)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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