信息科学与电子工程专业英语课后答案--王朔中

1、科技英语课件 ExercisesUnit 1 Exercises(1) Translate the following sentences into Chinese.1. As with series resonance, the greater the resistance in the circuit the lower the Q and, accordingly, the flatter and broader the resonance curve of either line current or circuit impedance.对于串联谐振，电路中的电阻愈大Q值就愈低，相应地

2、线路电流或电路阻抗的谐振曲线也就愈平、愈宽。2. A wire carrying a current looks exactly the same and weighs exactly the same as it does when it is not carrying a current.一根带电的导线其外表与重量都与不带电导线完全一样。3. Click mouse on the waveform and drag it to change the pulse repetition rate, or directly enter a new value of the period in t

3、he provided dialogue box, while keeping the pulse width unchanged.在波形上点击鼠标并拖动来改变脉冲重复频率，或者在提供的对话框中直接输入新的周期值，而保持脉冲宽度不变。 4. Electronics is the science and the technology of the passage of charged particles in a gas, in a vacuum, or in a semiconductor. Please note that particle motion confined within a

4、metal only is not considered electronics.电子学是一门有关带电粒子在气体、真空或半导体中运动的科学技术。注意，在本书中粒子运动仅限于金属的情况不属于电子学。5. Hardware technologies have played vital roles in our ability to use electronic properties to process information, but software and data processing aspects have not developed at the same speed.硬件技术在我们

5、使用电子特性来处理信息的能力中一直起着重要作用，而软件及数字处理方面却没能与硬件同步发展。6. However, in a properly designed DC amplifier the effect of transistor parameter variation, other than Ico, may be practically eliminated if the operation point of each stage is adjusted so that it remains in the linear operation range of the transistor

6、 as temperature varies.然而在设计得当的直流放大器中，若调节每一级的工作点使之在温度变化时保持在晶体管线性区，就能在实际上消除Ico以外的晶体管参数变化所造成的影响。(2) Fill in the blanks with the most appropriate choice.1. A message signal can any amplitude value between 0 and A volts.A. assumeB. useC. receiveD. accept2. Each time a positive clock edge occurs, the fli

7、p-flop changes state, leading to half as many pulses at the output to the clock input.A. asB. comparedC. dueD. so as3. In the previous section we discussed sine-wave or CW modulation systems in which the modulating signal _ of a digital pulse train.A. madeB. consistedC. containedD. got4. In this boo

8、k we shall emphasize the limitations imposed on the information transmitted by the system through which it was _ and shall attempt some comparison of different systems.A. putB. traveledC. passedD. viewed5. This signal either does not change, or it changes _ by an amount equivalent to one or more qua

9、ntum steps.A. interruptedlyB. rudelyC. abruptlyD. absolutely6. We shall only be _ with logical representations, not absolute valuesA. interestedB. caringC. referredD. concerned(3) Choose the phrase that is closest in meaning to the underlined part.1. It is all too easy with linear circuits, which ap

10、pear relatively simple when compared with todays complex logic arrangements, to ignore detailed performance parameters which can drastically reduce the expected performance.A. which has bad influence upon the system performance B. which is important to ensure circuit linearityC. which is possible to

11、 enhance the system performanceD. which is crucial for maintaining the desired performance2. Therefore there will be a slight time delay, due to the propagation delay of the flip-flops between the time one flip-flop changes state and the time the next one changes state, i.e., the change of state rip

12、ples through the counter, and these counters are therefore called ripple counters.A. the state change is propagated through the counter like ripples B. the state changes cause ripples in the counterC. passing through the counter, the state ripple changesD. the state of the counter changes due to rip

13、ples3. Instead of triggering on each pulse, a phase lock technique examines the relative phase between each oscillator and many of its sync pulses and adjusts oscillator frequency so that the average phase discrepancy is small.A. checks each oscillator for many sync pulsesB. checks the phase relatio

14、nship between individual oscillators and a collection of sync pulses C. looks at the relations between the phase and the sync pulsesD. examines whether the phase is relative to the oscillator and the sync pulses4. By keeping the off state slightly below threshold, the delay between the applied elect

15、rical pulse and the resulting optical output pulse is minimized; this delay must indeed not be more than the bit interval so that the optical pulse can accurately reproduce the input signal.A. ensuring that the system is off the threshold by a small marginB. maintaining the systems shut-down state s

16、omewhat below a prescribed levelC. making sure the system is below its threshold so that the state is kept off D. keeping the system in a shut-down state that is under a given level with a tiny tolerance5. If the original signal is well behaved, the local oscillator will need very little information

17、 to be able to track, and that information can be obtained by averaging for a long period of time, thereby eliminating noise that could be very large.A. the LO will not require any information in order to keep trackingB. the LO will make use of tracking information that is scarce in the systemC. the

18、 LO will require some information, but not much, so that the system can trackD. the LO will use no information other than some little one to maintain tracking6. The third section describes quantization schemes that take account of the characteristics of speech.A. take measure of the speech character

19、isticsB. take the speech characteristics into considerationC. count the speech characteristicsD. make use of the speech characteristics7. In a properly designed DC amplifier the effect of transistor parameter variation may be practically eliminated if the operating point of each stage is adjusted so

20、 that it remains in the linear operation range of the transistor as temperature varies.A. the effective variation of the transistor parametersB. the effort to change transistor parametersC. the transistor parameters that effectively changeD. the results caused by transistor parameter changes8. Stabi

21、lity and repeatability are fundamental attributes of digital circuits, however, and the necessary accuracy can be obtained in a digital version of the modulator by an appropriate choice of word length to represent the signals.A. by expressing the signals with a suitable word length B. by using a wor

22、d long enough to describe the signalsC. by choose to characterize the signals in terms of word length appropriatelyD. by appropriately representing the signals to choose a length of wordsUnit 2 Exercises (1) Translate the following sentences into Chinese.1. If analog signals are to be transmitted di

23、gitally, they first have to be sampled at a specified rate and further converted to discrete amplitude samples by quantization.如果要以数字方式传输模拟信号，首先必须以一定的频率对信号进行采样，然后通过量化进一步将它们转换为离散的幅度样本。2. Linear filters amplify or attenuate selected spatial frequencies, can achieve such effects as smoothing and sharpe

24、ning, and usually form the basis of re-sampling and boundary detection algorithms. 线性滤波器放大或衰减选择的空间频率，能够实现像平滑和锐化这些效果，通常是重采样和边缘检测算法的基础。3. Stability and repeatability are fundamental attributes of digital circuits, however, and the necessary accuracy can be obtained in a digital version of the modulato

25、r by an appropriate choice of word length to represent the signals.不过稳定性和可重复性是数字电路的基本性质，在数字式调制器中必要的精度可通过适当地选择代表信号的字长而获得。4. The first observation is made on the fundamental relationship between the nature of system and the periodicity of its frequency response: a continuous system has an aperiodic fr

26、equency response, while a discrete system has a periodic frequency response.从系统性质和它频率响应的周期性之间的基本关系中首先可以看到：连续系统有非周期性的频率响应，而离散系统有周期性的频率响应。5. The main function of the receiver is to extract the input message signal from the degraded version of the transmitted signal coming from the channel.接收器的主要功能是从由信

27、道传输来的退化了的信号中提取出输入消息。 (2) Choose the word or phrase that is closest in meaning to the underlined part.1. Roughly speaking, the transistor can be likened to an electronically controlled valve whereby energy applied to one connection of the valve enables energy to flow between two other connections.A.

28、relatedB. linkedC. analogizedD. viewed2. While third party design tools were available, there was not an effective link from the third party design tools to the layout and actual semiconductor process performance characteristics of the various ASIC manufacturers.A. WhenB. AlthoughC. AsD. Since3. The

29、se steps, implemented with a level of skill common in the industry, almost always produce a final device that correctly implements the original design, unless flaws are later introduced by the physical fabrication process.A. practiced using skills generally available in the industry B. commonly perf

30、ormed at levels of skilled personnel in the industryC. realized with the skillful common level in the industryD. carried out by skills commonly used in the industry4. A second major step would be to develop design specifications that consider the functionality of the human with the same degree of ca

31、re that has been given to the rest of the system.A. develop design procedures to account for the human behavior and activitiesB. promote design arrangements and take the human factors into considerationC. make used of design steps that respect the human functionalityD. draft and effect design requir

32、ements that take into account the human functionality 5. Click mouse on the waveform and drag it to change the pulse repetition rate or directly enter a new value of the period in the provided dialogue box, keeping the pulse width unchanged.A. simply type a new period value in the given dialogue box

33、B. direct an entry for the new period value to the dialogue boxC. point a straightforward new period value to the dialogue box providedD. enter a direction of a new period value to provide a dialogue box6. Compared with most of the textbooks at the introductory level of RF analog design, this book p

34、resents some hands-on experiences on the design issues that really work and has been proved by manufactured chips.A. this book provides some experiences at hand on the issues encountered in designB. this book provides some actually working experiences about the design problemsC. this book presents s

35、ome available experiences over the design problemsD. this book presents some issues concerning design experiences that are handed over7. For a decade there has been a search for a programmable processor which, given the cost and volume constraints, is general enough to be programmed with different a

36、lgorithms.A. with controlled measures of price and magnitudeB. given the condition of risk and numberC. given the constants of charge and weightD. given the limits of price and size8. In a properly designed DC amplifier the effect of transistor parameter variation, other than Ico, may be practically

37、 eliminated if the operating point of each stage is adjusted so that it remains in the linear operation range of the transistor as temperature varies. A. transistorB. amplifierC. IcoD. parameterUnit 3 Exercises(1) Translate the following sentences into Chinese.1. A very commonly used method of micro

38、wave measurements is based on the study of a standing wave pattern formed along the line because of the interference of incident and reflected waves.一个很常用的微波测量方法是基于对驻波图型的研究，这种驻波是由入射波和反射波之间的干涉而沿着传输线形成的。2. Computations show a reduction of 6dB in the EM field intensity with the distance doubled, and an

39、 increase of 3dB in the intensity with the transmitted power doubled. This result provides verification to the algorithm used.计算表明，当距离增大一倍时，电磁场强度减小6分贝；而发射功率增大一倍时，场强则增加3分贝。这一结果验证了所用算法的正确性。3. Like transfer of heat by conduction, convection and radiation, microwave heating can be considered as another

40、mode of heat transfer, in which heat is produced directly at the location of the dielectric losses. 就像通过传导、对流、辐射来传递热量一样，微波加热可以看作热传递的另一种方式，即热量直接产生于发生介电损耗的地方。4. Operation of the radar is based on the measurement of the time it takes for a pulse transmitted from an antenna to get reflected by the objec

41、t to be detected and to return at the antenna and the receiver.雷达的工作是基于对天线发出的脉冲被所要探测的目标反射，（然后）回到天线和接收机所需时间的测量。5. Other motivations for using CAD in circuit design includes the wish to acquire confidence in a design that was accomplished by other means, and, not least in importance, a sense of curios

42、ity or perhaps a desire to discover the unexpected.在电路设计中使用CAD的其它动机包括：想要验证用别的方法设计出来的电路；满足好奇心或者可能是想发现预想不到的现象。后一个动机并非是最不重要的。（取得信心，并非最不重要，意料之外的事）6. The spacing between the repeating amplifiers is a function of the cable attenuation and the system bandwidth so that the gain provided by these amplifiers

43、compensates for the loss introduced by the cable.中继放大器之间的间距是电缆衰减和系统带宽的函数，以便这些放大器提供的增益补偿电缆引起的损耗。7. When the cut-off frequency is no less than the maximal frequency of the original signal, nor is it greater than the difference between the sampling frequency and the maximal frequency, the original sign

44、al may be completely rebuilt.当截止频率不小于原始信号的最高频率，也不大于采样频率和最高频率之差，原始信号可以完整地重建。8. While the politics of the last one hundred years centered around Industrial Age technology, the politics of the future will be based on Information Age concerns oriented towards the storage, protection and exchange of info

45、rmation.尽管近百年来的政治活动是以工业时代的技术为中心的，未来的政治活动将基于信息时代的事物，面向信息的存储、保护和交换。(2) Choose the word or phrase that is closest in meaning to the underlined part.1. If these other charges and currents are comparable in size to the sources producing the above electromagnetic field, then a new net electromagnetic fiel

46、d will be produced.A. make comparison with the size of the sources B. are compared with the size of the sourcesC. have similar size to the sourcesD. take a common size of the sources2. This range of wavelengths has led many to question the naming convention used for microwaves as the name suggests a

47、 micrometer wavelength.A. has raised many questions about the naming habitB. has caused many people to challenge the naming rulesC. has led many questions of the naming conventionD. has resulted in many problems in the naming tradition3. NASA worked in the 1970s and early 1980s to research the possi

48、bilities of using Solar Power Satellite (SPS) systems with large solar arrays that would beam power down to the Earths surface via microwaves.A. shed solar energy to the Earths surface from the satellite B. set the satellite down to the Earths surface with powerC. shut down the power on (to) the Ear

49、ths surface from the satelliteD. switch off power to the Earths surface from the satellite4. As DoD urgently wanted military command and control networks that could survive a nuclear war, ARPA was charged with inventing a technology that could get data to its destination reliably even if arbitrary p

50、arts of the network disappeared without warning as a result of a nuclear attack.A. win a nuclear warB. be used in preparation of a nuclear warC. avoid a nuclear warD. be still operational after a nuclear war5. At the present, state of the art microwave amplifiers and oscillator tubes can operate in

51、a frequency range up to 40GHz and solid-state microwave devices up to 100GHz.A. recent and most advancedB. high tech relatedC. sophisticatedD. artistically manufactured6. In such a fiber rays traveling at larger angles with respect to the axis have to traverse a longer path and hence take a longer t

52、ime than those rays which propagate with smaller angles to the axis.A. have transmitted over a longer distanceB. are bound to treat a longer way C. must travel through a longer routeD. must deal with a longer trace7. By keeping the off state slightly below threshold, the delay between the applied el

53、ectrical pulse and the resulting optical output pulse is minimized; this delay must indeed not be more than the bit interval so that the optical pulse can accurately reproduce the input signal.A. this delay must indeed be no more than one internal bitB. indeed, this delay must exceed the bit of inte

54、rvalC. as a matter of fact, this delay interval must be a little bit lessD. this delay must indeed be kept less than the spacing between data bits8. Computations show a reduction of 6dB in the EM field intensity with the distance doubled, and an increase of 3dB in the intensity with the transmitted

55、power doubled. This result provides verification to the algorithm used.A. that, with a 6dB reduction, the EM field intensity is twice as strongB. that the EM field intensity is decreased by 6dB as the range is doubledC. that, in the EM field, intensity with double distance leads to a 6dB reductionD.

56、 a 6dB intensity reduction causes a double distance in the EM fieldUnit 4 Exercises (1) Translate the following passages into Chinese.1. Communication may be broadly defined as the transfer of information from one point to another. When the information is to be conveyed over any distance a communica

57、tion system is usually required. Within a communication system the information transfer is frequently achieved by superimposing or modulating the information on to an electromagnetic wave which acts as a carrier for the information signal. This modulated carrier is then transmitted to the required d

58、estination where it is received and the original information signal is obtained by demodulation. Sophisticated techniques have been developed for this process by using electromagnetic carrier waves operating at radio frequencies as well as microwave and millimeter wave frequencies. However, communication may also be achieved by using an electromagnetic carrier that is selected from the optical range of frequencies.通信可以广义地定义为从一处到另一处的信息传递。当要将信