電子信息工程專業(yè)英語教程（第6版） 試卷B

PAGEPagePAGE2ofNUMPAGES4TechnicalEnglishTestforElectronicInformationEngineeringCollege/Department____________Class___________Name____________Section123TotalScoreSECTION1Fillintheblankswithproperterms(30minutes).1時序圖6基站2動態(tài)范圍7截止頻率3邊緣檢測8載波4探頭9實時系統(tǒng)5脈沖寬度10像素11ADC16CCD12DSP17PDA13OS18AFG14DCT19CRT15LED20UUTSECTION2TranslatethefollowingpassagesintoChinese(40minutes).WhiletraditionalprocessorsfollowtheVonNeumannarchitecturemodel,whichassumesasharedsinglememorytobeusedforbothprograminstructionsanddata,DSPsusetheHarvardormodifiedHarvardarchitecture,whichincludesmultipleprogramanddatamemories,alongwithmultiplebusestoaccessthem.Thisarrangementmeansthatmuchlesswaitingisrequiredwheninstructionsornumbersarefetchedfrommemory.ITUrecommendedthatallgovernmentsreservespectrumat2GHzsodevicescouldroamseamlesslyfromcountrytocountry.Later,itwasrecognizedthat2Mbpsisnotcurrentlyfeasibleforuserswhoaretoomobile(duetothedifficultyofperforminghandoffsquicklyenough).Justlikeaconventionalcamera,adigitalcamerahasaseriesoflensesthatfocuslighttocreateanimageofascene.Butinsteadoffocusingthislightontoapieceoffilm,itfocusesitontoasemiconductordevicethatrecordslightelectronically.Amicroprocessorthenbreaksthiselectronicinformationdownintodigitaldata.Makesurethelenswillhandlethepicturesyouplantotake.Ifyoudon'thavetherightlens,itcanbehardtotakethebestpictures.Forexample,ifverycrispdetailisimportantinyourpictures,you'llprobablywantahighopticalzoomnumber.Besuretotryoutthelenssystemonacamerabeforeyoupurchaseit.Digitalcamerascomewithahugevarietyoflenses,sobesuretoshoparound.SECTION3Readthefollowingpassagesandanswerquestions(30minutes).PassageoneNaturemovesintheformofasinewave,beitanoceanwave,earthquake,sonicboom,explosion,soundthroughair,orthenaturalfrequencyofabodyinmotion.Energy,vibratingparticlesandotherinvisibleforcespervadeourphysicaluniverse.Evenlight–partparticle,partwave–hasafundamentalfrequency,whichcanbeobservedascolor.Sensorscanconverttheseforcesintoelectricalsignalsthatyoucanobserveandstudywithanoscilloscope.Oscilloscopesenablescientists,engineers,technicians,educatorsandothersto“see”eventsthatchangeovertime.Oscilloscopesareindispensabletoolsforanyonedesigning,manufacturingorrepairingelectronicequipment.Intoday’sfast-pacedworld,engineersneedthebesttoolsavailabletosolvetheirmeasurementchallengesquicklyandaccurately.Astheeyesoftheengineer,oscilloscopesarethekeytomeetingtoday’sdemandingmeasurementchallenges.Theusefulnessofanoscilloscopeisnotlimitedtotheworldofelectronics.Withthepropertransducer,anoscilloscopecanmeasureallkindsofphenomena.Atransducerisadevicethatcreatesanelectricalsignalinresponsetophysicalstimuli,suchassound,mechanicalstress,pressure,light,orheat.Amicrophoneisatransducerthatconvertssoundintoanelectricalsignal.Oscilloscopesareusedbyeveryonefromphysiciststotelevisionrepairtechnicians.Anautomotiveengineerusesanoscilloscopetomeasureenginevibrations.Amedicalresearcherusesanoscilloscopetomeasurebrainwaves.Thepossibilitiesareendless.Answerthefollowingquestionswithin50words.Q1: Areoscilloscopessignalssources?Whynot?Q2:Doestheword“demanding”meandifficultoreasy?Q3:Howcananoscilloscopemeasurethetemperaturechangeovertime?Q4:Whatfunctiondoesasensororatransducerperform?Q5:Pleasegivethereasonwhyoscilloscopesareregardedastheeyesofengineers?PassageTwoAlthoughover50yearsold,thestandardtelevisionsignalisstilloneofthemostcommonwaytotransmitanimage.Figure1showshowthetelevisionsignalappearsonanoscilloscope.Thisiscalledcompositevideo,meaningthatthereareverticalandhorizontalsynchronization(sync)pulsesmixedwiththeactualpictureinformation.Thesepulsesareusedinthetelevisionreceivertosynchronizetheverticalandhorizontaldeflectioncircuitstomatchthevideobeingdisplayed.Eachsecondofstandardvideocontains30completeimages,commonlycalledframes.Avideoengineerwouldsaythateachframecontains525lines,thetelevisionjargonforwhatprogrammerscallrows.Thisnumberisalittledeceptivebecauseonly480to486oftheselinescontainvideoinformation;theremaining39to45linesarereservedforsyncpulsestokeepthetelevision'scircuitssynchronizedwiththevideosignal.Determinethefollowingstatementistrue(T)orfalse(F):No.T/FStatementQ6:()Thetermcompositevideoisanaliasofstandardtelevisionsignal.Q7:()Therearemorethanonemethodsforvideotransmissionmentio