华中师范大学信号与系统期末a卷2011改[英文]

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1、华中师范大学2010–2011学年第二学期期末考试试卷（A卷）CourseSignals&SytemsCourseNO.84010112TeacherNo.oftheIIIIIIVITotalproblemsPoints18123040100学号：Score---------------------------------------------------------ScoreReader线I.Choice（2pointsforeachcorrectanswer）学生姓名：1.Thefreque

2、ncyspectrumofcontinuous-timeaperiodicsignalis（）.AaperiodiccontinuousspectrumBperiodiccontinuousspectrum-----------------------------CaperiodicdiscretespectrumDperiodicdiscretespectrum封2.InanLTIsystemthereisaht()=ht()*ht()*()ht，itsconnectinghardwareis（

3、）.123AparallelconnectionBseriesconnection年级：CfirstparallelthenseriesDfirstseriesthenparallel3.ConsiderContinuous-timesignalsf(t)andδ(t−t)，thenwehavef(t)∗δ(t−t)=（）.00Af(t)Bf(t−t)Cδ(t)Dδ(t−t)00----------------------------------密4．ConsiderContinuous-time

4、signalsf(t)andδ(t−t)，thenwehavef(t)δ(t−t)=（）.00专业：Af(t)δ(t)Bf(t−t)Cδ(t)Df(t)δ(t−t)00005．Letxt()1cos(2000=+πt)sin(4000+πt).Thenxt()isuniquelydeterminedbyitssamples2πxnT(),n=0,1,2±±LL,ifω=and().s：T）Aω>2000πBω>4000πCω>6000πDω>8000πssss院（系----------------

5、---------------------------------−2t−t6．Weconsiderasignalthatisthesumoftworealexponentials:xt()=3eut()2−eut(),theregionofconvergenceofxt()is().AℜeS{}>−2BℜeS{}>−1CℜeS{}<−1DℜeS{}<−27．AnLTIsystemisstableifandonlyiftheROCofitssystemfunctionH(s)includes().

6、Atheright-halfplaneBtheleft-halfplaneCtheentirejω-axis8．AcausalLTIsystemisstableifandonlyifallofthepolesofitssystemfunctionH(s)liein().Atheright-halfplaneBtheleft-halfplaneCtheentiresplaneDtheentirejω-axisScoreReaderII.Fillintheblanks（2pointsforeachco

7、rrectanswer）1.TimeandfrequencyscalingofFourierTransformexplainthatwhenthetransmissionrategetsfaster,thespectrumcomponentwillget.2.Ifthewidthoftherectangularpulsesignalgetsnarrow,itseffectivebandwidthwill___________.3.Ifthecycleoftheperiodicsignalgetsl

8、onger,itsspectrumintervalgets_________.sin4t4.Considerthecontinuous-timesignalxt()＝,itsFourierTransformXj(ω)＝___________.t5.Theperiodicsignal'sFourierTransformconsistsof______________________________.t6.Considerthecontinuous-timext()=∫δτ()dτ，t