信息科学课后答案王朔中Word格式文档下载.docx
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信息科学课后答案王朔中Word格式文档下载.docx
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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,maybepracticallyeliminatediftheoperationpointofeachstageisadjustedsothatitremainsinthelinearoperationrangeofthetransistorastemperaturevaries.
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.Amessagesignalcananyamplitudevaluebetween0andAvolts.
A.assumeB.useC。
receiveD。
accept
2.Eachtimeapositiveclockedgeoccurs,theflip-flopchangesstate,leadingtohalfasmanypulsesattheoutputtotheclockinput。
A.asB。
comparedC.dueD。
soas
3.Intheprevioussectionwediscussedsine—waveorCWmodulationsystemsinwhichthemodulatingsignal_______ofadigitalpulsetrain。
A。
madeB.consistedC。
containedD.got
4.Inthisbookweshallemphasizethelimitationsimposedontheinformationtransmittedbythesystemthroughwhichitwas_______andshallattemptsomecomparisonofdifferentsystems。
putB。
traveledC。
passedD.viewed
5.Thissignaleitherdoesnotchange,oritchanges______byanamountequivalenttooneormorequantumsteps.
interruptedlyB.rudelyC。
abruptlyD.absolutely
6.Weshallonlybe_______withlogicalrepresentations,notabsolutevalues
A.interestedB.caringC。
referredD.concerned
(3)Choosethephrasethatisclosestinmeaningtotheunderlinedpart。
1.Itisalltooeasywithlinearcircuits,whichappearrelativelysimplewhencomparedwithtoday’scomplexlogicarrangements,toignoredetailedperformanceparameterswhichcandrasticallyreducetheexpectedperformance。
A.whichhasbadinfluenceuponthesystemperformance
B.whichisimportanttoensurecircuitlinearity
C.whichispossibletoenhancethesystemperformance
D.whichiscrucialformaintainingthedesiredperformance
2.Thereforetherewillbeaslighttimedelay,duetothepropagationdelayoftheflip—flopsbetweenthetimeoneflip—flopchangesstateandthetimethenextonechangesstate,i.e.,thechangeofstateripplesthroughthecounter,andthesecountersarethereforecalledripplecounters。
A.thestatechangeispropagatedthroughthecounterlikeripples
B。
thestatechangescauseripplesinthecounter
C.passingthroughthecounter,thestateripplechanges
D。
thestateofthecounterchangesduetoripples
3.Insteadoftriggeringoneachpulse,aphaselocktechniqueexaminestherelativephasebetweeneachoscillatorandmanyofitssyncpulsesandadjustsoscillatorfrequencysothattheaveragephasediscrepancyissmall.
A.checkseachoscillatorformanysyncpulses
checksthephaserelationshipbetweenindividualoscillatorsandacollectionofsyncpulses
C.looksattherelationsbetweenthephaseandthesyncpulses
examineswhetherthephaseisrelativetotheoscillatorandthesyncpulses
4.Bykeepingtheoffstateslightlybelowthreshold,thedelaybetweentheappliedelectricalpulseandtheresultingopticaloutputpulseisminimized;
thisdelaymustindeednotbemorethanthebitintervalsothattheopticalpulsecanaccuratelyreproducetheinputsignal.
A。
ensuringthatthesystemisoffthethresholdbyasmallmargin
maintainingthesystem'
sshut—downstatesomewhatbelowaprescribedlevel
C。
makingsurethesystemisbelowitsthresholdsothatthestateiskeptoff
keepingthesysteminashut-downstatethatisunderagivenlevelwithatinytolerance
5.Iftheoriginalsignaliswellbehaved,thelocaloscillatorwillneedverylittleinformationtobeabletotrack,andthatinformationcanbeobtainedbyaveragingforalongperiodoftime,therebyeliminatingnoisethatcouldbeverylarge.
A.theLOwillnotrequireanyinformationinordertokeeptracking
B.theLOwillmakeuseoftrackinginformationthatisscarceinthesystem
C.theLOwillrequiresomeinformation,butnotmuch,sothatthesystemcantrack
D.theLOwillusenoinformationotherthansomelittleonetomaintaintracking
6.Thethirdsectiondescribesquantizationschemesthattakeaccountofthecharacteristicsofspeech.
A.takemeasureofthespeechcharacteristics
B.takethespeechcharacteristicsintoconsideration
C.countthespeechcharacteristics
makeuseofthespeechcharacteristics
7.InaproperlydesignedDCamplifiertheeffectoftransistorparametervariationmaybepracticallyeliminatediftheoperatingpointofeachstageisadjustedsothatitremainsinthelinearoperationrangeofthetransistorastemperaturevaries.
theeffectivevariationofthetransistorparameters
theefforttochangetransistorparameters
C.thetransistorparametersthateffectivelychange
D.theresultscausedbytransistorparameterchanges
8.Stabilityandrepeatabilityarefundamentalattributesofdigitalcircuits,however,andthenecessaryaccuracycanbeobtainedinadigitalversionofthemodulatorbyanappropriatechoiceofwordlengthtorepresentthesignals.
byexpressingthesignalswithasuitablewordlength
byusingawordlongenoughtodescribethesignals
bychoosetocharacterizethesignalsintermsofwordlengthappropriately
byappropriatelyrepresentingthesignalstochoosealengthofwordsUnit2Exercises
(1)TranslatethefollowingsentencesintoChinese.
1.Ifanalogsignalsaretobetransmitteddigitally,theyfirsthavetobesampledataspecifiedrateandfurtherconvertedtodiscreteamplitudesamplesbyquantization。
2.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.Linearfiltersamplifyorattenuateselectedspatialfrequencies,canachievesucheffectsassmoothingandsharpening,andusuallyformthebasisofre-samplingandboundarydetectionalgorithms。
3.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。
Stabilityandrepeatabilityarefundamentalattributesofdigitalcircuits,however,andthenecessaryaccuracycanbeobtainedinadigitalversionofthemodulatorbyanappropriatechoiceofwordlengthtorepresentthesignals。
4.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。
Thefirstobservationismadeonthefundamentalrelationshipbetweenthenatureofsystemandtheperiodicityofitsfrequencyresponse:
acontinuoussystemhasanaperiodicfrequencyresponse,whileadiscretesystemhasaperiodicfrequencyresponse。
5.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.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.
related
B.linked
analogized
D.viewed
2.Whilethirdpartydesigntoolswereavailable,therewasnotaneffectivelinkfromthethirdpartydesigntoolstothelayoutandactualsemiconductorprocessperformancecharacteristicsofthevariousASICmanufacturers。
A.When
B.Although
C.As
D.Since
3.Thesesteps,implementedwithalevelofskillcommonintheindustry,almostalwaysproduceafinaldevicethatcorrectlyimplementstheoriginaldesign,unlessflawsarelaterintroducedbythephysicalfabricationprocess。
A.practicedusingskillsgenerallyavailableintheindustry
B.commonlyperformedatlevelsofskilledpersonnelintheindustry
C.realizedwiththeskillfulcommonlevelintheindustry
D.carriedoutbyskillscommonlyusedintheindustry
4.Asecondmajorstepwouldbetodevelopdesignspecificationsthatconsiderthefunctionalityofthehumanwiththesamedegreeofcarethathasbeengiventotherestofthesystem。
developdesignprocedurestoaccountforthehumanbehaviorandactivities
B.promotedesignarrangementsandtakethehumanfactorsintoconsideration
makeusedofdesignstepsthatrespectthehumanfunctionality
D.draftandeffectdesignrequirementsthattakeintoaccountthehumanfunctionality
5.Clickmouseonthewaveformanddragittochangethepulserepetitionrateordirectlyenteranewvalueoftheperiodintheprovideddialoguebox,keepingthepulsewidthunchanged.
A.simplytypeanewperiodvalueinthegivendialoguebox
directanentryforthenewperiodvaluetothedialoguebox
C.pointastraightforwardnewperiodvaluetothedialogueboxprovided
enteradirectionofanewperiodvaluetopro
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