专业英语课后答案Word文档下载推荐.docx
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专业英语课后答案Word文档下载推荐.docx
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3.Clickmouseonthewaveformanddragittochangethepulserepetitionrate,ordirectlyenteranewvalueoftheperiodintheprovideddialoguebox,whilekeepingthepulsewidthunchanged.在波形上点击鼠标并拖动来改变脉冲重复频率,或者在提供的对话框中直接输入新的周期值,而保持脉冲宽度
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不变。
4.Electronicsisthescienceandthetechnologyofthepassageofchargedparticlesinagas,inavacuum,orinasemiconductor.Pleasenotethatparticlemotionconfinedwithinametalonlyisnotconsideredelectronics.电子学是一门有关带电粒子在气体、真空或半导体中运动的科学技术。
注意,在本书中粒子运动仅限于金属的情况不属于电子学。
5.Hardwaretechnologieshaveplayedvitalrolesinourabilitytouseelectronicpropertiestoprocessinformation,butsoftwareanddataprocessingaspectshavenotdevelopedatthesamespeed.硬件技术在我们使用电子特性来处理信息的能力中一直起着重要作用,而软件及数字处理方面却没能与硬件同步发展。
6.However,inaproperlydesignedDCamplifiertheeffectoftransistorparametervariation,otherthanIco,maybepracticallyeliminatediftheoperationpointofeachstageisadjustedsothatitremainsinthelinearoperationrange
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ofthetransistorastemperaturevaries.然而在设计得当的直流放大器中,若调节每一级的工作点使之在温度变化时保持在晶体管线性区,就能在实际上消除Ico以外的晶体管参数变化所造成的影响。
(2)Fillintheblankswiththemostappropriatechoice.1.Amessagesignalcanbetween0andAvolts.A.assumeB.useC.receiveD.acceptanyamplitudevalue
2.Eachtimeapositiveclockedgeoccurs,theflip-flopchangesstate,leadingtohalfasmanypulsesattheoutputtotheclockinput.A.asB.comparedC.dueD.soas
3.Intheprevioussectionwediscussedsine-waveorCWmodulationsystemsinwhichthemodulatingsignal_______ofadigitalpulsetrain.A.madegot4.Inthisbookweshallemphasizethelimitationsimposedontheinformationtransmittedbythesystemthroughwhichitwas_______andshallattemptsomecomparison
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B.consisted
C.containedD.
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ofdifferentsystems.A.putB.traveledC.passedD.viewed
5.Thissignaleitherdoesnotchange,oritchanges______byanamountequivalenttooneormorequantumsteps.A.interruptedlyabsolutely6.Weshallonlybe_______withlogicalrepresentations,notabsolutevaluesA.interestedB.caringC.referredD.concernedB.rudelyC.abruptlyD.
(3)Choosethephrasethatisclosestinmeaningtotheunderlinedpart.1.Itisalltooeasywithlinearcircuits,whichappearrelativelysimplewhencomparedwithtoday’scomplexlogicarrangements,toignoredetailedperformanceparameterswhichcandrasticallyreducetheexpectedperformance.A.whichhasbadinfluenceuponthesystemperformanceB.whichisimportanttoensurecircuitlinearityC.whichispossibletoenhancethesystemperformance
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D.whichiscrucialformaintainingthedesiredperformance2.Thereforetherewillbeaslighttimedelay,duetothepropagationdelayoftheflip-flopsbetweenthetimeoneflip-flopchangesstateandthetimethenextonechangesstate,i.e.,thechangeofstateripplesthroughthecounter,andthesecountersarethereforecalledripplecounters.A.thestatechangeispropagatedthroughthecounterlikeripplesB.thestatechangescauseripplesinthecounterC.passingthroughthecounter,thestateripplechangesD.thestateofthecounterchangesduetoripples3.Insteadoftriggeringoneachpulse,aphaselocktechniqueexaminestherelativephasebetweeneachoscillatorandmanyofitssyncpulsesandadjustsoscillatorfrequencysothattheaveragephasediscrepancyissmall.A.checkseachoscillatorformanysyncpulsesB.checksthephaserelationshipbetweenindividualoscillatorsandacollectionofsyncpulsesC.looksattherelationsbetweenthephaseandthesyncpulsesD.examineswhetherthephaseisrelativetotheoscillator
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andthesyncpulses4.Bykeepingtheoffstateslightlybelowthreshold,thedelaybetweentheappliedelectricalpulseandtheresultingopticaloutputpulseisminimized;
thisdelaymustindeednotbemorethanthebitintervalsothattheopticalpulsecanaccuratelyreproducetheinputsignal.A.ensuringthatthesystemisoffthethresholdbyasmallmarginB.maintainingthesystem’sshut-downstatesomewhatbelowaprescribedlevelC.makingsurethesystemisbelowitsthresholdsothatthestateiskeptoffD.keepingthesysteminashut-downstatethatisunderagivenlevelwithatinytolerance5.Iftheoriginalsignaliswellbehaved,thelocaloscillatorwillneedverylittleinformationtobeabletotrack,andthatinformationcanbeobtainedbyaveragingforalongperiodoftime,therebyeliminatingnoisethatcouldbeverylarge.A.theLOwillnotrequireanyinformationinordertokeeptrackingB.theLOwillmakeuseoftrackinginformationthatis
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scarceinthesystemC.theLOwillrequiresomeinformation,butnotmuch,sothatthesystemcantrackD.theLOwillusenoinformationotherthansomelittleonetomaintaintracking6.Thethirdsectiondescribesquantizationschemesthattakeaccountofthecharacteristicsofspeech.A.takemeasureofthespeechcharacteristicsB.takethespeechcharacteristicsintoconsiderationC.countthespeechcharacteristicsD.makeuseofthespeechcharacteristics7.InaproperlydesignedDCamplifiertheeffectoftransistorparametervariationmaybepracticallyeliminatediftheoperatingpointofeachstageisadjustedsothatitremainsinthelinearoperationrangeofthetransistorastemperaturevaries.A.theeffectivevariationofthetransistorparametersB.theefforttochangetransistorparametersC.thetransistorparametersthateffectivelychangeD.theresultscausedbytransistorparameterchanges8.Stabilityandrepeatabilityarefundamentalattributesofdigitalcircuits,however,andthenecessaryaccuracycan
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beobtainedinadigitalversionofthemodulatorbyanappropriatechoiceofwordlengthtorepresentthesignals.A.byexpressingthesignalswithasuitablewordlengthB.byusingawordlongenoughtodescribethesignalsC.bychoosetocharacterizethesignalsintermsofwordlengthappropriatelyD.byappropriatelyrepresentingthesignalstochoosealengthofwords
Unit2Exercises
(1)TranslatethefollowingsentencesintoChinese.1.Ifanalogsignalsaretobetransmitteddigitally,theyfirsthavetobesampledataspecifiedrateandfurtherconvertedtodiscreteamplitudesamplesbyquantization.如果要以数字方式传输模拟信号,首先必须以一定的频率对信号进行采样,然后通过量化进一步将它们转换为离散的幅度样本。
2.Linearfiltersamplifyorattenuateselectedspatialfrequencies,canachievesucheffectsassmoothingandsharpening,andusuallyformthebasisofre-samplingand
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boundarydetectionalgorithms.线性滤波器放大或衰减选择的空间频率,能够实现像平滑和锐化这些效果,通常是重采样和边缘检测算法的基础。
3.Stabilityandrepeatabilityarefundamentalattributesofdigitalcircuits,however,andthenecessaryaccuracycanbeobtainedinadigitalversionofthemodulatorbyanappropriatechoiceofwordlengthtorepresentthesignals.不过稳定性和可重复性是数字电路的基本性质,在数字式调制器中必要的精度可通过适当地选择代表信号的字长而获得。
4.Thefirstobservationismadeonthefundamentalrelationshipbetweenthenatureofsystemandtheperiodicityofitsfrequencyresponse:
acontinuoussystemhasanaperiodicfrequencyresponse,whileadiscretesystemhasaperiodicfrequencyresponse.从系统性质和它频率响应的周期性之间的基本关系中首先可以看到:
连续系统有非周期性的频率响应,而离散系统有周期性的频率响应。
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5.Themainfunctionofthereceiveristoextracttheinputmessagesignalfromthedegradedversionofthetransmittedsignalcomingfromthechannel.接收器的主要功能是从由信道传输来的退化了的信号中提取出输入消息。
(2)Choosethewordorphrasethatisclosestinmeaningtotheunderlinedpart.1.Roughlyspeaking,thetransistorcanbelikenedtoanelectronicallycontrolledvalvewherebyenergyappliedtooneconnectionofthevalveenablesenergytoflowbetweentwootherconnections.A.relatedB.linkedC.analogizedD.viewed2.Whilethirdpartydesigntoolswereavailable,therewasnotaneffectivelinkfromthethirdpartydesigntoolstothelayoutandactualsemiconductorprocessperformancecharacteristicsofthevariousASICmanufacturers.A.WhenB.Although
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C.AsD.Since3.Thesesteps,implementedwithalevelofskillcommonintheindustry,almostalwaysproduceafinaldevicethatcorrectlyimplementstheoriginaldesign,unlessflawsarelaterintroducedbythephysicalfabricationprocess.A.practicedusingskillsgenerallyavailableintheindustryB.commonlyperformedatlevelsofskilledpersonnelintheindustryC.realizedwiththeskillfulcommonlevelintheindustryD.carriedoutbyskillscommonlyusedintheindustry4.Asecondmajorstepwouldbetodevelopdesignspecificationsthatconsiderthefunctionalityofthehumanwiththesamedegreeofcarethathasbeengiventotherestofthesystem.A.developdesignprocedurestoaccountforthehumanbehaviorandactivitiesB.promotedesignarrangementsandtakethehumanfactorsintoconsiderationC.makeusedofdesignstepsthatrespectthehumanfunctionalityD.draftandeffectdesignrequirementsthattakeinto
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accountthehumanfunctionality5.Clickmouseonthewaveformanddragittochangethepulserepetitionrateordirec
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