综合专业英语试题

经典word整理文档，仅参考，转Word此处可删除页眉页脚。本资料属于网络整理，如有侵权，请联系删除，谢谢！专业英语试题一、词语翻译1.Electromagneticinduction电磁感应2.Broadcasting广播3.发射机Transmitter4.Encoder编码器14.Nonlinear非线性的15.Vacuum-tube真空（电子）管16.Modulationcoefficient调制系数17.Uppersidefrequency上边频18.调制信号modulationsignal19.直流电源DCpowersuply5.光电阴极Photocathode6.像素Pixel7.Harmonicstructure谐波结构8.多路器Mutiplexer9.电离层Ionosphere20.Quadrature21.振荡器resonator22.Inversion倒置正交10.Deterministic确定的23.差分difference24.Cascade串联，级联25.Deemphasis去加重功率谱密度powerclensityspectrum12.信噪比signal-to-noiseratio13.Demodulation解调，检波1.rmation4.opticalfiber场效应管示波器17.difference18.frequencymodulation调频19.frequencydivider20.viewpoint差分，差别信息，消息，情报光纤分频器观点5.signal-to-noise信噪比21.impurity22.nanometers23.packaging24.verylargeintegration路杂质，混合物纳米6.bandwidth7.vocaltract8.bipolar9.decoder10.Fourierseries11.decibel基带声带封装双极（线）的解（译）码器傅里叶级数分贝超大规模集成电25.digitalsignalprocessing数字信号处理26.baseband27.binary28.mainframe29.electronicmail30.mobiletelephoneservice移动电话业务基带12.modulation13.amplifier14.transformer15.resonator16.prescribe调制，调节放大器，扩音机变压器二进制编码主机，大型机电子邮件振荡器指示，规定二、英译汉1.Aseriallinkisoftenusedtoattachacomputertoamodem.答案：串口通常用来将计算机和调制解调器连接起来。2.Inthedatacommunicationsworld,datagenerallyaredefinedasinformationthatisstoredindigitalform.答案：在数据通信领域，数据通常定义成以数字形式存储的信息。3.Informationthathasbeenprocessed,organized,andstorediscalleddata.答案：经过处理、组织和存储的信息成为数据。4.Moderncommunicationsystemsusedigitalmodulationtechniques.答案：现代通信系统采用的是数字调制技术。15.Digitalmodulationoffersmanyadvantagesoveranalogmodulation.答案：数字调制比模拟调制有更多的优点。6.Inadigitalcommunicationsystem,inordertoincreasenoiseimmunity,itisnecessarytoincreasethesignalpower.答案：在数字通信系统中，为了增加抗噪性能，需要提高信号的功率。7.Theideaofcommunicationbylightprobablygoesbacktosignalfiresonprehistorichilltops.答案：用光来通信的想法大概可追溯到史前的山顶上的信号火。8.Phasemodulation(PM)andfrequencymodulation(FM)arespecialcasesofanglemodulatedsignaling.答案：相位调制和频率调制是角度调制信号传输的特例。9.Informationsignalsaretransportedbetweenatransmitterandareceiveroversomeformoftransmissionmedium.答案：信息信号通过某种介质在发射机与接收机之间传送。10.AMmodulatorsarenonlineardeviceswithtwoinputsandoneoutput.答案：幅度调制器是有两个输入和一个输出的非线性器件。11.Thefundamentalpurposeofanelectroniccommunicationsystemistotransferinformationfromoneplacetoanother.答案：电子通信系统的基本作用是把信息从此地传送到彼地。（1）Integratedcircuitsaremoreofascience,thanofatechnology.答案：集成电路与其说是技术，不如说是科学。（2）Thebandwidthofaninformationsignalisthedifferencebetweenthehighestandlowestfrequenciescontainedintheinformation,andthebandwidthofacommunicationschannelisthedifferencebetweenthehighestandlowestfrequenciesthatthechannelwillallowtopassthroughit.答案：信息信号的带宽就是信息中包含的最高和最低频率之间的频差，通信信道的带宽是可通过该信道的最高和最低频率之差。（3）Initssimplestform,awaveformgeneratorisanoscillatorcircuitthatgenerateswell-defined,stablewaveformsthatcanbeexternallymodulatedorsweptoveragivenfrequencyrange.答案：在最简单的情况下，波形发生器就是一个震荡器，他产生预定的稳定波形，然后再进行调制，或在给定的频率范围内扫描。（4）Inordertoreducetheeffectoffrequencyerrordistortionintelephonesystem,wehavetolimitthefrequencyerrorto2-5HZ.答案：为了减轻电话系统中的频率误差的影响，我们必须将误差控制在2-5赫兹。（5）Probablythemostsignificantadvantageofanglemodulationtransmission(FMandPM)overamplitudemodulationtransmissionisnoiseimmunity.答案:与幅度调制传输相比，角度调制传输（FM和PM）最主要的优点是抗噪声性能好。（6）Becauselaserwavelengthistemperature-sensitive,thecontrolcircuitsalsomonitortemperatureandcontrolcoolerswhentheyareincluded.答案：因为激光波长队温度敏感，控制电路需要监控温度，如果有冷却器的话，还要控制他们。（7）Thesimplestdigitalmodulationtechniquesisdigitalamplitudemodulation,whichissimplydouble-sideband,full-carrieramplitudemodulationwheretheinputmodulatingsignalisabinarywaveform.答案：最简单的数字调制技术上数字调幅，这种技术是简单的双边带，全载波幅度调制，只2是输入的调制信号是二进制波形。（8）Onedisadvantageofechoplex,however,occurswhenatransmittedcharacterhasbeenreceivedcorrectly,thenatransmissionerroroccurswhileitisbeingsentbacktotheoriginator.答案：当传送的字符已经正确接收，但是在回送的时候却发生了传输错误，这时就会造成一次不必要的重传，这就是回送的一个缺点。（9）Thekeyinnovationintelephonyarecircuitsswitching,digitization,separationofcallcontrolfromvoicetransfer,opticallinks,andserviceintegration.答案：电话技术中关键的革新有电路交换、数字化、语音传输与呼叫控制的独立、光链接以及综合业务。（10）Transmissionsfrombasestationstomobileunitsarecalledforwardlinksandtransmissionsfrommobileunitstobasestationsarecalledreverselinks.答案：基站到移动电话之间的传输称为前向链路，而移动电话到基站之间的传输则称为反向链路。三、汉译英1.数字计算机本质上是记录数字、运算数字和给出数字形式的结果的机器。2.带宽越宽，传送时间越长，系统传送的信息就越多。3.发射机和接收机之间各种扫描的同步，借助于消隐期间传送的专用同步脉冲来完成。4.在通信系统中，如果接收到的（平均）信号功率，与（平均）噪声功率相比足够大，信息就可以恢复。5.调幅是这样的过程，它使频率相当高的载波信号的幅度与调制信号（信息）的瞬时值成比例地变化。6.任何本振信号相对于载波的频率或者相位误差，都会引起调解信号的失真。7.在解调过程中使用限幅器，FM和PM解调器能够减小噪声电平，改善信噪比。8.解复用器必须可靠地分离光信道，确保一个信道对邻近信道的低泄露。9.数据通信中，必须实现四种类型的同步：位或时钟同步、调制解调器或载波同步、字符同步以及报文同步。10.模拟蜂窝信道可以用FMFSK信令信息时，禁止传输语音信号。答案：1.Digitalcomputersareessentiallymachinesforrecordingnumbers,operatingwithnumbersandgivingtheresultinnumbericalforms.2.Thewiderthebandwithandthelongerthetimeoftransmission,themoreinformationcanbeconveyedthroughthesystem.3.Synchronizationbetweenthevariousscanningoperationsatbothtransmitterandreceiverisaccomplishedbymeansofspecialpulsesthataretransmittedduringtheblankingperiods.4.Incommunicationsystems,ifthereceived(average)signalpowerissufficientlylargecomparedtothe(average)noisepower,informationmaybereceived.5.Amplitudemodulation(AM)istheprocessofchangingtheamplitudeofarelativelyhignfrequencycarriersignalinproportionwithinstantaneousvalueofthemodulatingsignal(information).6.Anyerrorinthefrequencyorthephaseofthelocaloscillatorsignalinthereceiver,whthrespecttothecarrierwave,givesrisetodistortioninthedemodulatedsignal.7.Withtheuseoflimiters,FMandPMdemodulatorscanactuallyreducethenoiseandimprovethesignal-to-noiseratioduringthedemodulationpocess.8.Demultiplexersmustreliablyseparatetheopticalchannels,withlowleakageofligntfromone3opticalchannelintoanadjacentchannel.9.Indatacommunications,therearefourtypesofsynchronizationthatmustbeachived:bitorclocksynchronization,modemorcarriersynchronization,charactersynchronization,andmessagesynchronization.10.AnalogcellularchannelscarrybothvoiceusingFManddigitalsignalinginformationusingbinaryFSK.Whentransmissiondigitalsignalinginformation,voicetransmissionsareinhibited.1.频移的大小等于两个正交振荡器的频率差。2.这种在解调过程中由于频率误差而产生的失真是SSB系统独有的。3.任何本信号相对于载波的频率或者相位误差，都会引起解调信号的失真。4.为了减轻电话系统中的频率误差的影响，我们必须将误差控制在2~5赫兹。5.可以采用锁相环电路来实现较高频率的正交振荡器。6.在数据通信领域,数据通常定义成以数字形式存储的信息。7.现代通信系统采用的是数字调制技术。8.无线是无线电系统的一个基本的部件，是提供发射或接收无线电波的一种装置。9.电磁波在自由空间的传播通常叫射频（）转播或为无线电传播。10.传输线可以分为平衡式的喝非平衡式的两种。答案：1.Theamountoffrequencyshiftisequaltotheabsolutevalueofthedifferencebetweenthefrequenciesofthequadratureoscillator.2.ThistypeofdistortioncausedbyfrequencyerrorinthedemodulationprocessisuniquetoSSBmodulationsystem.3.Anyerrorinthefrequencyorthephaseofthelocaloscillatorsignalinthereceiver,withrespecttothecarrierwave,givesrisetodistortioninthedemodulatedsignal.4.Inordertoreducetheeffectoffrequencyerrordistortionintelephonesystems,wehavetolimitthefrequencyerrorto2-5Hz.5.Aphase-lock-loop(PLL)circuitcanbeimplementedthatwillgiveahigherfrequencyquadratureoscillator.6.Inthedatacommunicationsworld,datagenerallyaredefinedasinformationthatisstoredindigitalform.7.Moderncommunicationsystemsusedigitalmodulationtechniques.8.Theradioantennaisanessentialcomponentinanyradiosystem,aradioantennaisadevicethatprovidesameansforradiatingorreceivingradiowaves.9.Free-spacepropagationofelectromagneticwavesisoftencalledradiofrequency(RF)propagationorsimplyradiopropagation.10.Transmissionlinescanbegenerallyclassifiedasbalancedorunbalanced.()。a))(接收机)(上升时间)(带宽)，————；；；；；a)()4)。()()；；；))(()a((微波)(电缆系统)—答案：；；；；；；；()a———aa——,,——a—aaa——.；；；；；；；)aa),—)——.——a,aA———