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1、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Unit11抽样量化编码samplingquantizingcoding2话路speechchannel3幅值amplitudevalue4抽样频次samplingfrequency5抽样速率samplingrate6脉冲流streamofpulses7重复率repetitionrate8编码过程codingprocess9模拟信号analogsignal10传输质量transmissionquality11数字通讯digitalcommunication12数字传输digitaltransmission13噪声环境noisy
2、environment14传输路径transmissionpath15信噪比signaltonoiseratio16信号电平signallevels17地面系统terrestrialsystem18噪声功率noisepower19二进制传输binarytransmission20反向操作reverseoperation218位码序列8-digitsequence22接收端receivingterminal23帧格式frameformat24同步字synchronizationword25时分复用TDMUnit21串行接口serialinterface2显示终端CRTterminal3发送器和接
3、受器transmitterandreceiver4数据传输datatransmission5数据流datastream6安闲状态theidlestate7传号电平marklevel8空号电平spacelevel9开端位startbit10停止位stopbit11连续时间T秒durationofTseconds12奇遇校验位paritybit13错误标记errorflag14传输错误transmissionerror15降落沿fallingedge16符号间的空格intersymbolspace/17接收机的准时receivertiming18当地时钟localclock复习资料二：专业英语填空
4、练习一选择适合的答案填空（正确答案已在题顶用“”表示）:1.Urgentcommunicationswhichcouldnotbecauseofnoreplyoneendofthelinkcouldhavedramaticconsequences.A.establish,inB.isestablished,withC.beestablishing,toD.beestablished,at()2.Theoperatorofalocaltelephoneswitchboardhadanoptionanopticaloracousticalsignalforthepersonoverawiredne
5、twork.A.transmit,searchB.totransmit,searched()C.transmitting,searchingD.totransmit,tosearch3.Theoperationofacommunicationnetworkneedsamessagingsystem.A.tobecomplementwithB.complementtoC.tobecomplementedby()D.tocomplementedin4.Thuswasbornanew,butperpetuallypagingserviceasaone-wayselectivesignalingsys
6、temwithoutspeech.A.developing,defined()B.developed,definingC.develop,defineD.todevelop,todefine5.Today,certainmodelsofpagersareevenequippedwithadisplaycapabilityofopticalmessagesof10to80characters.A.provide,consistB.provided,consistedC.providing,consisting()D.provision,consistant6.Pagingsystemsusing
7、radiotransmitterstothisserviceremaincurrentlyinusemainlyforserviceareanotafewkilometers.A.dedicate,exceedB.dedicating,exceededC.isdedicated,isexceededD.dedicated,exceeding()二选择适合的答案填空（正确答案已在题顶用“”表示）:1.Oneofmanyreasonsforacellularmobiletelephonesystemanditinmanycitiesistheconventionalmobiletelephones
8、ystem.A.develop,deployB.todevelop,todeployC.developing,deploying()D.developed,deployed2.Theidealmobiletelephonesystemwouldoperatewithinaassignedfrequencybandandwouldserveanalmostnumberofusersinareas.A.limited,unlimited,unlimited()B. limitation,limitation,limitationC. limit,limit,limitD. limiting,lim
9、iting,limiting3.LSItechnologyandmassproductioncontributetoreducedcostinthefutureanaverage-incomefamilyshouldbeableamobiletelephoneunit.A.which,affordingB.that,affordedC.when,affordD.sothat,toafford()4.Microprocessorsandminicomputersarenowforcontrollingmanycomplicatedfeaturesandfunctionswithlesspower
10、andsizewaspreviouslypossible.A.used,than()B.use,thisC.using,theyD.usage,it5.OnJan.4,1979,theFCCIllinoisBellTelephoneCo.adevelopmentalcellularsystemintheChicagoareaandmakealimitedofferingofitscellularservicetothepublic.A.authorize,conductB.authorizing,conductingC.authorized,toconduct()D.toauthorize,c
11、onducted6.Why800MHz?TheFCCsdecision800MHzwasbecauseofseverespectrumlimitationsatlowerfrequencybands.A.tochoose,made()B.choose,tomakeC.choice,makeD.choice,making三选择适合的答案填空（正确答案已在题顶用“”表示）：1.ComputerdatainthepublicdomainbyapacketswitcheddatanetworkX.25protocols.A.aretransported,basedon()B.transports,ba
12、seonC.transported,basedonD.totransport,base2.WhenthefutureBISDNnetwork,onemustallpossibleexistingandfutureservices.A.design,takeB.designing,takeintoaccount()C.designed,accountD.todesign,taking3.Atelexnetworktelexinformation,i.e.characters,atverylowspeed.A.transports,transported()B.transported,transp
13、ortC.totransport,totransportD.transporting4.TheNISDNcannottransportTVsignalsitslimitedbandwidthcapabilities,soaspecialTVnetworkisstill.A.because,requireB.with,torequireC.dueto,required()D.within,requiringmessagesof5.Eachnetworkisonlycapableonespecificserviceforitwasintentionallydesigned.A.oftransporting,which(C.transport,where
