数字信号处理（英文）智慧树知到期末考试答案章节答案2024年西北工业大学

数字信号处理（英文）智慧树知到期末考试答案+章节答案2024年西北工业大学

答案:错

答案:错TodesignanIIRhigh-passfilter,bilineartransformshouldbeusedinsteadofimpulseinvariance.（）

答案:对

答案:对WecannotguaranteeadigitalfilterwithlinearphaseinIIRfilterdesignusingbilineartransformorimpulseinvariance.（）

答案:对

答案:causal###time-invariant###linearWhatarethemaincharacteristicsofanti-aliasingfilter?（）

答案:Tolimittheadditivenoisespectrumandotherinterference,whichcorruptsthesignal###Ensuresthatbandwidthofsignaltobesampledislimitedtofrequencyrange###LowpassfilteringThelargerthequantizationstepis,thehigherthesignal-to-noiseratiowillbe.（）

答案:错TheROCofz-transformofanysignalcannotcontainpoles.（）

答案:对TheSNRincreasesabout6dBforeachbitaddedforquantization.（）

答案:对RegardingIIRfilterdesign,whichofthefollowingprototypefiltershouldbechosenifthereisanrequirementofmonotonicinthestopband?（）

答案:ChebyshevIfilter###Butterworthfilter

答案:对x[n]*(h1[n]*h2[n])=(x[n]*h1[n])*h2[n].（）

答案:对Todesignacausalband-stopFIRfilterwithgeneralizedlinear-phase,whichofthefollowingcanbechosen:（）

答案:

答案:time-invariant###linear###causal###stable

答案:

答案:WhatistheROCofz-transformofantwosidedinfinitesequence?（）

答案:r2<|z|Whichofthefollowingisdonetoconvertacontinuoustimesignalintodiscretetimesignal?（）

答案:Sampling

答案:WhichofthefollowingconditionistobesatisfiedfortheFouriertransformofasequencetobeequalastheZ-transformofthesamesequence?（）

答案:|z|=1Whichofthefollowingis/aretheadvantageofIIRfilter?（）

答案:Closed-formdesign###PrototypefiltersWhichofthefollowingconditionsmadedigitalsignalprocessingmoreadvantageousoveranalogsignalprocessing?（）

答案:Flexibility###Storage###Accuracy###Robustness

答案:Arealvaluedsignalx[n]iscalledasanti-symmetricif（）

答案:x[n]=-x[-n]

答案:DIT

答案:1

答案:1-aWhichofthefollowingistheadvantageofFIRfilter?（）

答案:Linearphase

答案:5.Whatistheprocedureofasystemfordigitalprocessingofananalogsignal?（）

答案:Analogsignal||Anti-aliasingfilter->A/DConverter->DigitalProcessor->D/AConverter->Reconstructionfilter

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答案:

答案:IfallthepolesofH(z)areinsidetheunitcircle,thenthesystemissaidtobe（）

答案:BIBOstableandcausal

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答案:AlineartimeinvariantsystemissaidtobeBIBOstableifandonlyiftheROCofthesystemfunction（）

答案:IncludesunitcircleForadecimation-in-frequencyFFTalgorithm,whichofthefollowingistrue?（）

答案:Inputisinsequentialorderandoutputisinbit-reversedWhatistheDFTofthefourpointsequencex[n]={0,1,2,3}?（）

答案:{6,-2+2j,-2,-2-2j}

答案:

答案:

答案:

答案:WhichofthefollowingistheadvantageofHanningwindowoverrectangularwindow?（）

答案:Smallersidelobes

答案:

答案:|a|r1<|z|<|a|r2

答案:8

答案:

答案:WhatistheROCofthesystemfunctionH(z)ifthediscretetimeLTIsystemisBIBOstable?（）

答案:ContainunitcircleThez-TransformX(z)ofadiscretetimesignalx[n]isdefinedas（）

答案:Ifx[n]isarealsequenceandX[k]isitsN-pointDFT,thenwhichofthefollowingistrue?（）

答案:AllofthementionedWhichofthefollowingisthedifferenceequationofaspecialcaseofFIRsystem?（）

答案:RegardingIIRfilterdesign,whichofthefollowingprototypefiltershouldbechosenifthereisanrequirementofmonotonicinboththepassbandandstopband?（）

答案:ButterworthfilterTodesignaband-stopfilter,youwouldchoose:（）

答案:FIRfilterdesignthroughwindowingwiththewindowsizeanevennumber.###IIRfilterdesignusingbilineartransform.ConsideringFIRfilterdesignusingwindowingmethod.Thewidthofthetransitionbandisapproximatelythesameas:（）

答案:mainlobewidthRegardingIIRfilterdesign,whichofthefollowingprototypefilterwillgenerallyresultinthelowestorder（）

答案:Ellipticfilter

答案:anFIRlowpassfilter

答案:ThissystemisFIR

答案:ThissystemisIIR

答案:C###D###E###B

答案:FIR###linearphase

答案:B###E###A###C###F

答案:0InC/Dconverter,theinputsignaliscontinuousanditwillbesampled.Astheresult,theoutputsignalisdigital.（）

答案:错Inapracticalsystem,thereisananti-aliasingfilterbeforeA/Dconverter.Suchafiltershouldbe:（）

答案:lowpass

答案:Ifwewishtorecoveracontinuoussignalfromitssamples,whatkindoffiltershallweuse,ideally?（）

答案:lowpassWhatarethemajortwotypesofFFTcomputation?（）

答案:DIF###DITWhatistheorderofoutputsequenceforDIF-FFT?（）

答案:Bit-reversedWhatistheorderofinputsequenceforDIT-FFT?（）

答案:Bit-reversedWhatistheorderofcomputationalcomplexityfor16-pointDFTinit'sdirectcomputation?（）

答案:256Whatistheorderofcomputationalcomplexityfor16-pointDFTinit'sFFTcomputation?（）

答案:64Whichofthefollowingshouldhaveduality?（）

答案:DFT###DFSIfthereisamodulewhichcanfindouttheoutputofanLTIsystemusingDFT,whichofthefollowingstatementis/aretrue?（）

答案:TheLTIsystemshouldbeFIR.###Theinputsignalofthesystemshouldbefiniteinlength.DFTis,inessence,periodicastheDFS,sinceitcorrespondstosamplingtheFouriertransform.IndefiningtheDFTrepresentation,wearesimplyrecognizingthatweareinterestedinthevaluesinoneperiod.（）

答案:对TherearetwosignalswithlengthN1andN2,respectively.IfwewishtofindouttheirlinearconvolutionthroughM-pointDFT,whichofthefollowingMcanbeapplied?（）

答案:N1+N2

答案:对

答案:对

答案:1

答案:1DFSisperiodic.（）

答案:对

答案:-1

答案:Causalbutnotstable###Notcausalandnotstable###NotcausalbutstableForanFIRsystem,it’sROCofz-transformis（）

答案:Theentirez-planeexceptfor0orinfinity

答案:SupposewehaveanLTIsystem,anditsinputisanimpulsesequence.Whatarethenamefortheoutputanditsz-transform?（）

答案:impulseresponseandsystemfunctionTheeigenfunctionofanLTIsystemisthe（）

答案:complexexponentialsequence

答案:1WhichofthefollowingisthecorrectformulaforDTFT?（）

答案:TheFouriertransformofanaperiodicsequenceis（）

答案:Continuous###PeriodicWhichofthefollowingis/arecorrespondingtoalowfrequency?（）

答案:Convolutionsumisusefulforcomputationoftheoutputifthesystemis（）。

答案:linear&timeInvariant

答案:NoperiodIfthesequenceisoflengthLandtheimpulseresponseofanLTIsystemisoflengthP.Whatwillbethelengthaftertheirconvolution?（）

答案:L+P-1IfanLTIsystemhasanimpul