电子信息类专业英语第二版汤滟部分习题答案

Unit22.Translatethefollowingphrasesandexpressions:(1)thetimerateofchangeofcharge电荷相对时间的变化率(2)potentialdifference电位差(3)electromotiveforce电动势(4)one-thousandthofanampere千分之一安培（毫安）(5)freeelectrons自由电子3．BACBACAACA4.FFTFT5.TranslatethefollowingsentencesintoEnglish:(1)电阻器的大小称为电阻，用字母符号R表示。ThevalueofresistoriscalledresistanceandisrepresentedbythelettersymbolR.(2)电动势可对电荷作功。Electromotiveforcecandoworkoncharges.(3)欧姆定律用于表示电流，电压与电阻之间的关系。“Ohm’sLaw”pertainstotherelationshipbetweencurrent,voltageandresistance.(4)电荷的移动形成电流。Themotionofchargesconstitutesanelectriccurrent.Unit42.Translatethefollowingphrasesandexpressions.(1)thetransistorvoltageamplifiers晶体管电压放大器(2)audioandvideosignals音频和视频信号(3)anamplitudecutoffisdesired要求振幅削波(4)thebasecurrentiBcancontrolthecollectorcurrentiC基极电流iB可以控制集电极电流iC(5)threefundamentalconfigurations三种基本组态(6)thevoltagegainAu＞0电压增益Au＞0(7)thehighfrequencyandwidebandcircuits高频及宽带电路(8)beconvertedtosoundinaloudspeaker转换成扬声器中的声音(9)amplifyallfrequenciesequallyandwithlowdistortion几乎不失真的放大所有频率的信号3.CBABCA4.FFFTF5.TranslatethefollowingsentencesintoEnglish.(1)线性放大器能几乎不失真的放大输入信号，其输出与输入成正比。Alinearamplifiercanamplifyinputsignalwithlittleornodistortion,sothattheoutputisproportionaltotheinput.(2)因为共集组态电路的电压增益略小于1，故又称之为电压跟随器。Thevoltagegainofthecommon-collectorisslightlylessthanone,soitiscalledvoltagefollower.(3)三极管的基极电流iB可控制集电极电流iC,用公式iC=βiB表示。Forabipolarjunctiontransistor,thebasecurrentiBcancontrolthecollectorcurrentiC,representedbytheformulaiC=βiB.(4)射频放大器用于处理频率范围在100千赫到1吉赫的信号。Radiofrequencyamplifiersareusedtodealwiththesignalsthattheirfrequenciesgenerallyrangefrom100KHzto1GHz.Unit62.Translatethefollowingphrasesandexpressions.(1)twodifferentvoltagelevels两种不同的电平(2)theclosed–switchstatecanberepresentedby1开关闭合状态可以用1表示(3)beachievedbyusingvoltagepulses通过使用电压脉冲来实现(4)solid-statetransducers固态变频器(5)thecomplementarymetaloxidesemiconductorlogic(CMOS)互补型金属氧化物半导体逻辑(6)alargescaledigitalsystem大规模数字系统(7)触发器flip-flop(8)数字逻辑电路digitallogiccircuit3.CCABB4.TFFF5.TranslatethefollowingsentencesintoEnglish.(1)在逻辑电路中数字“0”和“1”代表着两种不同电压的信号。Inlogiccircuit,thedigit“0”and“1”representsignalswithtwodifferentvoltage.(2)在二进制系统中110表示十进制的6。Inthebinarysystem,thenumber110canberepresentedby6indecimal.(3)数字逻辑门分成三种类型：与门，或门，非门。Thedigitallogicgatesaredividedintothreetypes:AND,ORandNOTgate.(4)任何复杂的逻辑电路均由基本逻辑门组成的。Anycomplicatedlogiccircuitsconsistofthefundamentallogicgates.Unit82.Translatethefollowingphrasesandexpressions:(1)通用自动计算机UNIVAC(universalautomaticcomputer)(2)very-large-scaleintegratedcircuit超大规模集成电路(3)thecombinationofhardwareandbasicsoftware硬件与基本软件的结合(4)makesthedetailsofthehardwarearchitectureinvisibletotheuser使用户不必关注硬件结构的细节(5)tobeclassifiedeitheras“external”or“internal”被分为“外部的”和“内部的”(6)translatessourcecodeintoobjectcode将源代码转换成目标代码3(1)b(2)c(3)d(4)a(5)e4.FTFFT6.TranslatethefollowingsentencesintoEnglish:(1)在关闭电脑电源之前，必须确定所需的数据已经保存好。Besurethatthenecessarydatahasbeenkeptbeforeyoucutoffthesourceofthecomputer.(2)输入输出端口都允许处理器与外部相互作用。Theinputandoutputterminalsallallowtheprocessortointeractwithoutsideworld.(3)通过提供给计算机一个或多个输入，可将程序分解。Theprogramsmaybedisintegratedbyprovidingoneormoreinputstothecomputer.(4)CPU按逻辑顺序来读取来自存储器中的每条指令。CPUreadseachinstructionfromthememoryinlogicorder.Unit162.Translatethefollowingphrasesandexpressions:(1)数字信号处理DSP(DigitalSignalProcessing)(2)anelectricalsignalcarriedbyawireoraradiowave由电线或无线电波承载的电信号(3)aremote-sensingsatellite遥感卫星(4)beconvertedintodigitalformbeforeDSPtechniquescanbeapplied在应用DSP技术之前转换成数字形式(5)模数转换器ADC(Analog-to-DigitalConverter)(6)electricalinterference电磁干扰(7)removeoratleastreducetheunwantedpartofthesignal去除或最大限度减弱不需要的信号(8)harddiscdrivecontrollersandmodems硬盘驱动器以及调制解调器3.ACBDBA4.FTFTT5.(1)c(2)e(3)a(4)b(5)d6.TranslatethefollowingsentencesintoEnglish:(1)数字信号处理器能够一边采样，一边处理实时信号。Thedigitalsignalprocessorcanprocesstherealtimesignalswhileitissampled.(2)数字信号通常由一系列的二进制形式的数字组成。Thedigitalsignalgenerallyconsistsofastreamofnumbersinthebinaryform.(3)现在，为了提高信号的品质而进行的信号滤波更多地采用数字信号处理技术来实现。Nowadays,thefilteringofsignalstoimprovesignalqualityisdonebyDSPtechniques.(4)有了数字信号压缩技术，人们可以通过一根普通的电话线传输声音和图像信号。Audioandvideosignalscanbetransmittedbyaconventionaltelephonelinewithdigitalsignalcompressiontechnology.Unit172.Translatethefollowingphrasesandexpressions:(1)超外差式无线接收机superheterodyneradioreceiver(2)todemodulatetheincomingmodulatedsignal解调输入的已调波信号(3)载波调谐carrier-frequencytuning(4)separatethedesiredsignalfromothermodulatedsignals将需要的信号与其他已调信号分离(5)tocompensateforthelossofsignalpower补偿信号的功率损耗(6)构造可调谐的、具有高选择性的可变滤波器buildatunablehighlyselectiveandvariablefilter(7)包络检波器anenvelopedetector(8)betunedtothecarrierfrequencyoftheincomingwave调谐到输入信号载频上(9)还原基带信号torecoverthebasebandsignal3.CBABC4.FFTFT5.(1)d(2)e(3)a(4)c(5)b6.TranslatethefollowingsentencesintoEnglish:(1)无线电接收机能完成载波调谐、滤波及放大的功能。Theradioreceivercanfulfillthefunctionssuchascarrier-frequencytuning,filteringandamplification.(2)超外差接收机由射频部分、混频器和本地振荡器、中频部分、解调器和功率放大器组成。ThesuperhetreceiverconsistsofaRFsection,amixerandlocaloscillator,anIFsection,demodulatorandpoweramplifier.(3)频谱搬移不会破坏载波与边带的关系。Thefrequencyspectrumtranslationcanbeachievedwithoutdisturbingtherelationshipofthesidebandstothecarrier.Unit182.Translatethefollowingphrasesandexpressions:(1)无线通信系统radiocommunicationsystem(2)theconveyingortransmissionofinformationfromonepointtoanother从一地到另