專業(yè)英語詞匯1課件

專業(yè)英語Keywords:aerial adj.天線的n.天線e.m.wave 電磁波convey vt.傳遞themorsecode 莫爾斯電碼inacontrolledway 有控制的bang n.響聲QualityofService服務(wù)質(zhì)量ServiceStatus服務(wù)狀態(tài)Keywords:

FloatType 浮點(diǎn)型（數(shù)據(jù)）s.s.b=singlesideband 單邊帶reinsert n.重插入takeplace 發(fā)生allowfor 考慮到，允許multiply v.乘，擴(kuò)大IntersymbolInterference碼間干擾

AuxiliaryEquipment輔助設(shè)備Keywords:Coverage覆蓋CoverageArea覆蓋范圍,覆蓋區(qū),有效區(qū)Interference干擾PreliminaryDesign概要設(shè)計(jì),初步設(shè)計(jì)Jam-to-signalratio干擾信號比Interfererdiversity干擾源分集Interference-AdaptiveSystem干擾自適應(yīng)系統(tǒng)Keywords:感應(yīng)電荷Inductivecharge高保真度音響HighFidelity高層兼容性HighLayerCompatibility高電位差Highpotentialdifference高頻HighFrequency（HF）高增益天線Highgainantenna高增益功放板HighgainPowerAmplifierboard告警面板AlarmpanelKeywords:告警模塊Alarmmodule格式轉(zhuǎn)換FormatConversion

隔行掃描InterlaceScanning個(gè)人編碼PersonalNumber個(gè)人識別碼PersonalIdentityNumber工程手冊EngineeringManual工具軟件ToolSoftware個(gè)人通信網(wǎng)，專用通信網(wǎng)PersonalCommunicationsNetworkKeywords:規(guī)程Procedure規(guī)定容限,可接受容限Tolerance規(guī)范和描述語言Specification&DescriptionLanguageSDL

規(guī)則脈沖激勵(lì)長期預(yù)測RegularPulseExcitedLong-TermPrediction硅鋼片SiliconSteelSheet硅谷SiliconValley硅控整流器SiliconControlRectifier

Keywords:骨干網(wǎng)BackboneNetwork固定比特率ConstantBitRate

固定衛(wèi)星業(yè)務(wù)FixedSatelliteServices固定信道分配FixedChannelAllocation固態(tài)繼電器Solid-stateRelay故障,錯(cuò)誤fault,error，failure,Bug故障定位Faultlocating故障申告受理FaultComplaintHandlingKeywords:光探測器Photodetector光開關(guān)OpticalSwitch光纜FiberOpticCable光連接器FiberConnectors光濾波器OpticalFilters光敏電阻OpticalResistor光耦合器OpticalCouplers光收發(fā)模塊OpticalTransceiversIfatransmittingaerialradiatesaconstantamplitudee.m.waveitconveyslittleinformationtothereceiver.

transmit 發(fā)射，傳播aerial 天線radiate 輻射constant 常量，不變的amplitude 振幅e.m.wave=electromagneticwave 電磁波convey 傳達(dá)receiver 接收者，接收機(jī)Thesimplestwayofsendinginformationistoswitchthetransmitteronandoffsothataseriesof'dotsanddashes'aretransmitted--themorsecodeforexample.Thisisaverycommonmethodofcommunicatingbetweenshipsatsea,butitdoesrequiretheoperatorto'read'thecode.switchon(off) 開（關(guān)）aseriesof 一連串的morsecode 莫爾斯電碼operator 話務(wù)員Anyprocessofsuperimposingsomepatternonthecontinuouse.m.wavewhichallowsinformationtobecarriediscalledmodulation.Wesaythecarrierwaveismodulated.Tomodulateacarrierwaveallweneedtodoistovaryapropertyofthewaveinacontrolledway.superimpose 迭加modulation 調(diào)制carrierwave 載波property 特性，性質(zhì)inacontrolledway 有控制地Generally,interference—fromlightingorelectricalmachines--producesamplitudedisturbancesonane.m.wavepassingby.干擾是在光電產(chǎn)品中,伴隨著電磁波的傳播而產(chǎn)生幅度的干擾Becausetheamplitudeoff.m.carrierisnotcarryinginformation，調(diào)頻載波幅度并不承載信息suchinterferencehasverylittleeffectonthereceivedsignal.Thisisnotthecasewithana.m.carrier,但是調(diào)幅載波就不一樣了，whereallsuchbangsandcracklearedetectedatthereceiveras'information'.interference 干擾amplitudedisturbance 振幅波動receivedsignal 接收信號bang 巨響crackle 劈啪響Ontheotherhandthebandwidthofthea.m.carrierismuchlessthanthatofthef.m.carrierasweshallnowshow.下面將給出例子ontheotherhand 另一方面bandwidth 帶寬muchless 少得多Ifwemodulatea100kHzcarrierwitha1kHzsignal，itmightbeexpectedthatalthoughthecarrieramplitudewouldmissandfallinstepwiththeamplitudeofthe1kHzsignalthecarrierfrequencywouldremainat100kHz.盡管載波幅度回?fù)p失和下降到與…一致,但其頻率仍有期望保持在…Infacttwonewfrequencycomponentscanbedetectedinthemodulatedcarrier;theyare101kHzand99kHz.instepwith 與…同步remain 保持component 成分modulatedcarrier 調(diào)制波Fig.5.1Thecarrierandsidebandsofana.m.signalbandwidthcarrierLowersiderbanduppersiderband2ffc-fsfcfc+fsThe‘carrier’componentremainsatconstantamplitudeandisnotconveyinginformation(exceptaboutitsownfrequency).載波的成分保持在一個(gè)固定的幅度且并不傳播信息Itrepresents‘wasted’transmitterpower.Sometimesitisnotradiated沒有輻射--thenwehavea‘suppressedcarriera.m.transmission'.抑制Sometimesonlythecarrierandonesidebandareradiated,sometimesonlyonesideband(s.s.b=singles.b.).represent 表明wasted 浪費(fèi)，消耗suppress 抑制transmission 傳輸Iflessthanthefulla.m.carrier完全振幅調(diào)制載波istransmittedthereceiverneedstobemorecomplicatedtoreceiveit,接收非常復(fù)雜becausebasicallythecarriermustbereinsertedatthereceiverbeforedetectioncantakeplace.在檢波前要重新再植入一個(gè)載波lessthan 小于complicated 復(fù)雜的reinsert 重新插入detection 檢波Transmittersshouldbespacesapartinfrequencytoallowforthesebandwidthrequirements.Thereareinternationalagreementsaboutfrequenciesbuttheyarenotobservedbyallcountries.transmitter 發(fā)射機(jī)spaceapart 空間分離allowfor 慮及，考慮到bandwidthrequirement 帶寬要求internationalagreement 國際協(xié)議observe 遵守Forthemathematicallyinclineditiseasytoshowthatthesinusoidalmodulationoftheamplitudeofasinusoidalwave-formresultsintheproductionofsumanddifferencefrequencies.inclined 傾向sinusoidalmodulation 正弦調(diào)制sinusoidalwave-form 正弦波形resultin 導(dǎo)致，體現(xiàn)Supposewehaveanun-modulatedcarrier(fc)oftheforma=Asin(2πfct)whereaistheinstantaneousamplitudeandAisthemaximumamplitude,oftensimplyreferredtoastheamplitudeofthecarrier.NowletusmodulateAsinusoidallyatafrequencyfs,andwrite.suppose 假設(shè)un-modulated 未調(diào)制instantaneousamplitude 瞬時(shí)值maximumamplitude 最大值sinusoidally 正弦地Whenkis1wehave100%modulation,forthetwosidebandseachofamplitudeA/2cancombinetomakethetotalamplitudevaryfromzeroto2A.“for”引導(dǎo)原因狀語從句；“Whenkis1”是時(shí)間狀語從句；“eachofamplitudeA/2”則是后置定語，修飾“sideband”。Inthecaseoff.m.amathematicalanalysisofthemodulatedcarrierismoredifficultthanfora.m.andwouldinvolveusinBesselfunctions.mathematicalanalysis 數(shù)學(xué)分析modulatedcarrier （已）調(diào)制載波Besselfunctions 貝塞爾方程involvein 涉及Besselwasanineteenthcenturymathematicianwhohadtheforesighttosolvetheveryequationsweneedforf.m.Sowecangostraighttotheendofthemathematicalprocessandfindthata