复习资料一《专业英语》词和词组 缩略写.docx

复习资料一《专业英语》词和词组 缩略写.docx

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复习资料一《专业英语》词和词组缩略写

复习资料一：

《专业英语》词和词组缩略写

Unit1

1抽样量化编码samplingquantizingcoding

2话路speechchannel

3幅值amplitudevalue

4抽样频率samplingfrequency

5抽样速率samplingrate

6脉冲流streamofpulses

7重复率repetitionrate

8编码过程codingprocess

9模拟信号analogsignal

10传输质量transmissionquality

11数字通信digitalcommunication

12数字传输digitaltransmission

13噪声环境noisyenvironment

14传输路径transmissionpath

15信噪比signaltonoiseratio

16信号电平signallevels

17地面系统terrestrialsystem

18噪声功率noisepower

19二进制传输binarytransmission

20反向操作reverseoperation

218位码序列8-digitsequence

22接收端receivingterminal

23帧格式frameformat

24同步字synchronizationword

25时分复用TDM

Unit2

1串行接口serialinterface

2显示终端CRTterminal

3发送器和接受器transmitterandreceiver

4数据传输datatransmission

5数据流datastream

6空闲状态theidlestate

7传号电平marklevel

8空号电平spacelevel

9起始位startbit

10停止位stopbit

11持续时间T秒durationofTseconds

12奇遇校验位paritybit

13错误标志errorflag

14传输错误transmissionerror

15下降沿fallingedge

16符号间的空格intersymbolspace

17接收机的定时receivertiming

18本地时钟localclock

复习资料二：

《专业英语》填空练习

一．选择合适的答案填空（正确答案已在题中用“√”表示）:

1.Urgentcommunicationswhichcouldnotbecauseofnoreplyoneendofthelinkcouldhavedramaticconsequences.

A.establish,inB.isestablished,with

C.beestablishing,toD.beestablished,at（√）

2.Theoperatorofalocaltelephoneswitchboardhadanoptionanopticaloracousticalsignalforthepersonoverawirednetwork.

A.transmit,searchB.totransmit,searched（√）

C.transmitting,searchingD.totransmit,tosearch

3.Theoperationofacommunicationnetworkneedsamessagingsystem.

A.tobecomplementwithB.complementto

C.tobecomplementedby（√）D.tocomplementedin

4.Thuswasbornanew,butperpetuallypagingserviceasaone-wayselectivesignalingsystemwithoutspeech.

A.developing,defined（√）B.developed,defining

C.develop,defineD.todevelop,todefine

5.Today,certainmodelsofpagersareevenequippedwithadisplaycapabilityof

opticalmessagesof10to80characters.

A.provide,consistB.provided,consisted

C.providing,consisting（√）D.provision,consistant

6.Pagingsystemsusingradiotransmitterstothisserviceremaincurrentlyinusemainlyforserviceareanotafewkilometers.

A.dedicate,exceedB.dedicating,exceeded

C.isdedicated,isexceededD.dedicated,exceeding（√）

二．选择合适的答案填空（正确答案已在题中用“√”表示）:

1.Oneofmanyreasonsforacellularmobiletelephonesystemand

itinmanycitiesistheconventionalmobiletelephonesystem.

A.develop,deployB.todevelop,todeploy

C.developing,deploying（√）D.developed,deployed

2.Theidealmobiletelephonesystemwouldoperatewithinaassignedfrequencybandandwouldserveanalmostnumberofusersin

areas.

A.limited,unlimited,unlimited（√）

B.limitation,limitation,limitation

C.limit,limit,limit

D.limiting,limiting,limiting

3.LSItechnologyandmassproductioncontributetoreducedcostinthefutureanaverage-incomefamilyshouldbeableamobiletelephoneunit.

A.which,affordingB.that,afforded

C.when,affordD.sothat,toafford（√）

4.Microprocessorsandminicomputersarenowforcontrollingmanycomplicatedfeaturesandfunctionswithlesspowerandsizewaspreviouslypossible.

A.used,than（√）B.use,thisC.using,theyD.usage,it

5.OnJan.4,1979,theFCCIllinoisBellTelephoneCo.adevelopmentalcellularsystemintheChicagoareaandmakealimitedofferingofitscellularservicetothepublic.

A.authorize,conductB.authorizing,conducting

C.authorized,toconduct（√）D.toauthorize,conducted

6.Why800MHz?

TheFCC’sdecision800MHzwasbecauseofseverespectrumlimitationsatlowerfrequencybands.

A.tochoose,made（√）B.choose,tomake

C.choice,makeD.choice,making

三．选择合适的答案填空（正确答案已在题中用“√”表示）：

1.Computerdatainthepublicdomainbyapacketswitcheddatanetwork

X.25protocols.

A.aretransported,basedon（√）B.transports,baseon

C.transported,basedonD.totransport,base

2.WhenthefutureBISDNnetwork,onemustallpossibleexistingandfutureservices.

A.design,takeB.designing,takeintoaccount（√）

C.designed,accountD.todesign,taking

3.Atelexnetworktelexinformation,i.e.messagesofcharacters,

atverylowspeed.

A.transports,transported（√）B.transported,transport

C.totransport,totransportD.transporting

4.TheNISDNcannottransportTVsignalsitslimitedbandwidthcapabilities,soaspecialTVnetworkisstill.

A.because,requireB.with,torequire

C.dueto,required（√）D.within,requiring

5.Eachnetworkisonlycapableonespecificserviceforitwasintentionallydesigned.

A.oftransporting,which（√）B.transporting,one

C.transport,whereD.totransport,when

四.选择合适的答案填空（正确答案已在题中用“√”表示）

1.Thetelephonecontainsatransmitterandreceiverforbackandforth

analogvoiceandanalogelectricalsignals.

A.convert,inB.converting,between（√）

C.conversion,toD.converted,into

2.Eachsubscriberconnecrslocallooptoaswitchingcenter,asanendoffice.

A.to,callingB.with,known

C.the,knowD.via,known（√）

3.Thetrunksaredesignedmultiplevoice-frequencycircuits

eitherFDMorsynchronousTDM.

A.carry,useB.carried,used

C.tocarry,touseD.tocarry,using（√）

4.Althoughoriginallytoserviceanalogtelephonesubscribers,thetelephonenetworkhandlessubstantialdatatrafficmodem,andgraduallybeingconvertedtoadigitalnetwork.

A.implemented,via（√）B.implementing,in

C.toimplement,withinD.design,on

5.Designershavefounditconvenientthesenodesintoahierarchyortreetopology,fiveclassesofswitchingcentersornodes.

A.organization,consistB.organize,consisting

C.toorganize,consisting（√）D.organizing,toconsist

复习资料四：

专业英语短文翻译

1.Thereadermayask,howdoesthedemultiplexerknowwhichgroupof8-digitsrelatestochannel1,2,andsoon?

Clearlythisisimportant!

Theproblemiseasilyovercomebyspecifyingaframeformat,whereatthestartofeachframeauniquesequenceofpulsescalledtheframecode,orsynchronizationword,isplacedsoastoidentifythestartoftheframe.Acircuitofthedemultiplexerisarrangedtodetectthesynchronizationword,andtherebyitknowsthatthenextgroupof8-digitscorrespondstochannel1.

2.Advancesinaudio,videoandspeechcodingandcompressionalgorithmsandprogressinVeryLargeSystemIntegrationtechnologyinfluencethebitrategeneratedbyacertainserviceandthuschangetheservicerequirementsforthenetwork.Inthefuture,newserviceswithunknownrequirementwillappear.Forthetimebeingitisyetunclear,e.g.whattherequirementintermsofbitrateforHDTVwillbe.Aspecializednetworkhasgreatdifficultiesinadaptingtochangingornewservicerequirements.

3.Whenthetransmitterwishestosenddata,itfirstplacesthelineinaspacelevel（i.e.,thecomplementofamark）foroneelementperiod.ThiselementiscalledthestartbitandhasadurationofTseconds.Thetransmitterthensendsthecharacter,1bitatatime,byplacingeachsuccessivebitonthelineforadurationofTseconds,untilallbitshavebeentransmitted.Thenasingleparitybitiscalculatedbythetransmitterandsentafterthedatabits.Finally,thetransmittersendsastopbitatamarklevel（i.e.thesamelevelastheidlestate）foroneortwobitperiods.Nowthetransmittermaysendanothercharacterwheneveritwishes

4.Thecellularswitch,whichcanbeeitheranalogordigital,switchescallstoconnectmobilesubscriberstoothermobilesubscribersandtothenationwidetelephonenetwork..Italsocontainsdatalinksprovidingsupervisionlinksbetweentheprocessorandtheswitchandbetweenthecellsitesandtheprocessor.Theradiolinkcarriesthevoiceandsignalingbetweenthemobileunitandthecellsite.MicrowaveradiolinksorwirelinescarrybothvoiceanddatabetweenthecellsiteandtheMTSO.

5.Today'stelecommunicationnetworksarecharacterizedbyspecialization.Thismeansthatforeveryindividualtelecommunicationserviceatleastonenetworkexiststhattransportsthisservice.Afewexamplesofexistingpublicnetworksaredescribedbelow

Computerdataaretransportedinthepublicdomainbyapacketswitcheddatanetwork（PSDN）basedonX.25protocol

6.Today’stelecommunicationnetworksarecharacterizedbyspecialization.Thismeansthatforeveryindividualtelecommunicationserviceatleastonenetworkexiststhattransportsthisservice.Afewexamplesofexistingpublicnetworksaredescribedbelow:

Computerdataaretransportedinthepublicdomainbyapacketswitcheddatanetwork（PSDN）basedonX.25protocols.

Televisionsignalscanbetransportedinthreeways:

broadcastviaradiowavesusinggroundantenna,bythecoaxialtreenetworkofthecommunityantennaTV（CATV）networkorrecentlyviaasatellite,usingtheso-calleddirectbroadcastsystem（DBS）

7.ByfarthemostpopularserialinterfacebetweenacomputeranditsCRT（显示器）terminalistheasynchronousserialinterface.Thisinterfaceissocalledbecausethetransmitteddataandthereceiveddataarenotsynchronizedoveranyextendedperiodandthereforenospecialmeansofsynchronizingtheclocksatthetransmitterandreceiverisnecessary.Infact,theasynchronousserialdatalinkisaveryoldformofdatatransmissionsystemandhasitsoriginintheeraoftheteleprinter.

8.Atthereceivingendofanasynchronousserialdatalink,thereceivercontinuallymonitorsthelinelookingforastartbit.Oncethestartbithasbeendetected,thereceiverwaitsuntiltheendofthestartbitandthensamplesthenextN