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1、Test（Chapter1,2,3,4）参考答案I.Blankfilling(Totalscores60,eachscores5.)1、（70％）2、（96％）3、（92％）4、Piecewisefunctioncanbecomprisedbyrectangularwindowfunctions(可以用矩形窗函数构造分段函数).Considerasignal，theevencomponentofis＝，theoddcomponentofis＝（46％）（92％）5、Considerasignal，and，so。(Expressyouranswerbyrectan
2、gularwindowfunctionlikeI.4)先做微分（76％）6、Necessaryandsufficientconditionsforstabilityofthesystemisitsimpulseresponseshouldbe【int(f(x),-inf,inf)＝】（37％）7、considerasignal，则(ExpressyouranswerbyrectangularwindowfunctionlikeI.4)（87％）8、KnownFouriertransformoff(t)is，sotheFouriertransformofis。（7
3、1％）9、TheFouriertransformofis（83％）10、AsystemSwithinputandoutputrelatedbyistimeinvariantwhile=.Constant（6％）11、,thenofis2T（73％）II.Singlechoice(Totalscores24,eachscores6.)1.Theequivalentexpressionofis(D)A：B：C：D：2.RefertotheFouriertransformof,todeterminewhentheFouriertransformofis,thenis(
4、B)A：B：C：D：3.Theinpute(t)andoutputr(t)ofacontinuoussystemisregulatedbyr(t)=e(t+2),thenthesystemis(D)A：causal,time-variant,linear,stableB：causal,time-invariant,nonlinear,unstableC：non-causal,time-variant,linear,stableD：non-causal,time-invariant,linear,stable4.Theinputf(t)andoutputr(t)o
5、fasystemisgovernedby,thenthesystemis(B)A:Linearandtime-invariantsystemB:Linearandtime-variantsystemC:Nonlinearandtime-invariantsystemD:Nonlinearandtime-variantsystemIII.TrueorFalse.(Totalscore16,eachscores2.)1.Ifsysteminputis,thenthesystemislinear.T2.If(foranyn),andkisaknownconstant,
6、thentheLTIsystemwithunitimpulseresponseh[n]isstable.F3.TheFouriertransformofrealevensignalisalsoarealevenfunction.T4.Foranysystem,theimpulseresponsecompletelydescribesitsbehavior.F5.Ifh(t)istheunitimpulseresponseofaLTIsystem,andh(t)isperiodicandnon-zero,thenthesystemisunstable.T6.The
7、summationoftwoperiodicsignalsisalsoaperiodicsignal.F7.LTIsystemmustbecausal.F8.TheFouriertransformofarealoddsignalisapurelyimaginaryandoddfunctionoffrequency.T
