电子科技大学大三电子信息专业通信原理英文考试卷及答案 (4)

密封 线密 封 线 内 不 得 答 题院系 班级 _____________ 读写组 姓名 学号2018至2019学年第一学期期末考试电子信息类专业英语（闭卷）课程性质：必修 考核方式：考试 专业：计算机学院2018级注意事项：1、 答卷必须用黑色或蓝色笔作答，不许使用铅笔或红色笔；2、 本卷共五大题，满分100分，考试时间90分钟。

1.cur rent________________ (电流） 2. y in dustr________________ (工业) 3. pany com ________________(公司)4. app ly________________(应用) 5. po wer (能量) 6.sym bol (符号)7.de dio (二极管) 8.Vo lt age(伏特) 9. resi stor(电阻)10. vi deo(录像)（ ）1.digital （ ）2. transmit （ ）3. signal （ ）4. resistor （ ）5. switch （ ）6. work （ ）7.electricity （ ）8. device ( ) 9.media ( ) 10. circuit A. 设备 B. 电路 C. 媒体 D. 数字的 E. 传输 F. 电阻 G. 工作H.信号I. 开关J. 电（ ）1. alternating current (AC) A. 数字电视 （ ）2. DTVB. 失去控制（ ）3. Integrated Circuits(ICs) C. 交流电 （ ）4. out of control D. 集成电路 （ ）5. logic gate E. 宽频带 （ ）6. FMF. 逻辑门 （ ）7. direct current (DC)G. P 型结 （ ）8. P-type regionH. 在控制之下 （ ）9. under controlI. 直流电 （ ）10. widebandJ. 频率调制I. Spell the English words with the given letters according to the Chinese given. (20 points, 2 points for each) 用所给字母拼写出符合汉语意思的单词。

一、根据英文单词写出中文词义（每题1分共20分）silicon 硅2 power dissipation 功耗3 flip flop 触发器4 base band 基带5 micron 微米6 assembly language 汇编语言7 transient response 瞬态响应8 quality factor 品质因子9 power supply 电源10. quantization level 量化电平11. undersampling 欠采样12. dielectric 介电的13. decibel 分贝14. duty cycle 占空比15. transducer 传感器16. emulation 仿真17. power-up 加电18. buffer 缓冲器19. semi-custom 半定制20. synthesis 综合二、根据中文词义写出英文单词（每题1分共20分）1. 电流源current source2．晶体管transistor3．周期period4．稳定性stability5．矢量vector6．复位reset7．除法division8．振荡器oscillator9．锁存器latch10．滤波器filter11．电感inductance12．电容capacitance13．寄存器register14．正反馈positive feedback15．并联parallel16．谐振resonance17. 晶体crystal18．原理图schematic19．整流器rectifier20．增益gainWhat is a filter? A filter is a device that passes electric signals __at_ certain frequencies or frequency ranges __while_ preventing the passage of others.Filter circuits are used ___in____ a wide variety of applications. In the filed of telecommunication (在电信领域),band-pass filters are used in the audio frequency range (0kHz to 20kHz) for __modem and speech processing__ (调制解调器和语音处理).High-frequency band-pass filters(several hundred MHz) are used for ____channel selection_ (信道选择)in telephone central offices. Data acquisition systems usually require _anti-aliasing low-pass filters__（抗混叠低通滤波器) as well as low-pass noise filters in their preceding __signal conditioning_ (信号调理)stages. System power supplies often use band-rejection filters to suppress the 60-Hz frequency and high frequency transients. In addition, there are filters that do not filter_ (滤除)any frequencies of a complex input signal, but just add a ___linear phase shift__ (线性相移)to each frequency component，thus contributing a constant __time delay__（时延）.These are called ___all-pass filter__ (全通滤波器).At high frequencies (>1 MHz), all of these filters usually consist __of_ passive components __such as__ inductors (L), resistors (R), and capacitors(C). They are then __called______ LRC filters. In the low frequency range (1 Hz to 1 MHz), however, the inductor value becomes very large and the inductor itself gets quite bulky, ___making__ economical production difficult. In these _cases_____, _active filters_(有源滤波器) becomes important. Active filters are circuits that use _operational amplifier__ (运算放大器) as the active device ___in__ combination with some resistors and capacitors to provide an LRC-like filter performance at low frequency.四. 翻译（每题5分共40分）1. As in the first-order case, the second-order low-pass transfer function tends to zero as frequency tends to infinity.当频率趋近于无穷时，二阶低通滤波器的传输函数趋近于零（和一阶低通滤波器的传输函数一样）。

《电⼦信息专业英语》课程期末考试卷（A卷）1 共2页第1页XXXX 职业技术学院20 19⾄2020学年第⼆学期考核试卷课程名称__电⼦信息专业英语___ 卷号 _A__ 课程考核类别：□考试□考查考核形式开卷笔试使⽤专业班级 XX 移动通信技术班出卷⼈ __XXX_______ 审卷⼈__XXX___ 考试时间__90___分钟⼀、Judge true and false according to technical knowledge.（每⼩题1分，共10分）1. Multimedia means many forms of communication such as audio and video.( )2. An embedded controller may lack any human-readable interface devicesat all. ( )3. There is no movement in the animation. ( )4. The microcontroller units use the embedded design and have higherintegration. ( )5. Before applying DSP, a digital signal must be converted into analog form.( )6. To avoid self-heating, the current through the RTD must be keptsufficiently low and constant. ( )7. The roles of the encoder and the demodulator are almost the same in thatboth prepare the signal appearing across its output terminals. ( )8. The Third Generation is the mobile multimedia based on CDMA technology.( )9. Insert an ammeter in the circuit to measure current. ( )10. View shortcut menus by left-clicking with the mouse. ( )⼆、Translate the following phrases and expressions.（每⼩题2分，共30分）(1)document (2)menu (3)version(4)integration (5)sideband (6)interference(7)transducer (8)detector (9)protocol(10)static graphic images (11) serial ports (12)read-only memory (13)an envelope detector(14)power amplifier (15)communication system三、Match Column A with Column B.（每⼩题2分，共10分）Column A Column B.（1）toolbar a. a device measure the temperature of environment base on the variation of resistance (2)DSP b. the medium used to transmit thesignal from the transmitter to the receiver (3)temperature sensing device c. common used computer commands chosen from the View/ menu, whichare displayed in tool buttons(4)amplification d. the processing of signals bydigital means(5)channel e. to compensate for the loss ofsignal power四、Choose the best answer.（每⼩题2分，共20分）1. The 555 integrated circuit is used for .A. timingB. filterC. amplifierD. instrument2. GPS determines by computing the difference between the time asignal is sent and the time it is received.A. distanceB. timeC. locationD. length3. Wireless communications means transmission of information by .A. optical fiberB. cableC. radioD. fixed telephone4. Resistance-Temperature Detector is a device which be used tomeasure .A. temperatureB. resistanceC.voltageD. current5. Digital television receiver covert the ananlog, or , electronictelevision signals received by an antenna into an electronic digital code.A. separateB. continuousC. slenderD.disperse6. The phrase ”volatile memory ” can be replace by .A. ROMB.RAMC. EEPROMD. EPROM7. A digital signal consits of a stresm of numbers, usually(but notnecessary) in form.专业班级_____________ 学号______________ 姓名________________装订线A. binaryB. decimalC. analogD. octal8. The radio receiver has the task of the imcoming modulated signal.A. amplifyingB. transmittingC. modulatingD. demodulating9. The chooses the best form for the signal in order to optimize its detection at the ouput.A. encoderB. decoderC. modulatorD. demodulator10. The value of one resitance is 2kΩ, another is 4kΩ, these two resistor are in parallel with eachother and in series with a battery of 12V. The current following through the resistor which resistance is 4kΩis .A. 9mAB. 6mAC. 3mAD. 2mA五、Translate the following sentences into Chinese.（每⼩题6分，共30分）1. Multimedia technology combines audio and visual material to enhance communication and enrich multimedia presentation.2. In addition to all arithmetic and logic elements of a general purpose microprocessor, the microcontroller usually also integrates additional elements such as read-only and read-write memory, and input/output interfaces.3. In a broadcasting system, irrespective of whether it is based on amplitude modulation or frequency modulation, the receiver not only has the task of demodulating the incoming modulated signal, but it is also required to perform some other system functions such as carrier-frequency tuning, filtering, amplification.4. Television is a system of sending and receiving pictures and sound by means of electronic signals transmitted through wires and optical fibers or by electromagnetic radiation.5. Multimedia services add high speed data transfer to mobile devices, allowing new video, audio and other applications through mobile phones —allowing music and television and the Internet to be accessed through a mobile terminal.1 共2页第1页。

学院_______________________ 系别____________ 班次_____________ 学号__________ 姓名________________………….……密…..……….封……..……线………..…以………..…内………....答…………...题…………..无…….….效…..………………..电子科技大学 20XX 至 20XX 学年 第 1 学期<< 通信原理 >> 课程考试题 (120分钟) 考试日期 20XX 年 1 月 10 日1. A n analog signal with the spectrum⎪⎩⎪⎨⎧<-=othersHz f f f M ,02000||,2500||1)( is to be transmittedover a PCM system. Assume that 0=eP and that there is no ISI. The peaksignal-to-noise ratio at the receiver output needs to be at least 50 dB.(a) find the maximum allowable time interval between sample values S T . (b) W hat will be the number of quantizing steps needed?(c) Determine the minimum bit rate required in the PCM signal. (d) W hat is the first null bandwidth of the PCM signal for the polar NRZ signaling case ？Solutiona. f s =2B =2*2000=4000Hz ，T s =1/f s =1/4000=0.25msb. 50=6.02n +4.77，n =7.5，n =8，M =2n =256c. R =nf s =8*4000=32000bit/s=32 Kbit /sd. B null =R=32 KHz2. A binary line code that has a rectangular pulse shape is sent over a channel without ISI. Assume the impulse response of the overall system is0e 0sin()h (t)=f t f tππ, where 310f Hz =. (a) Find the zero points in the system impulse response and the minimumsymbol period T s without introducing ISI.(b) Find the maximum bit rate that can be supported by this system. (c) Find the absolute bandwidth B for this transmission system.Solution: (a)300(0)10(0),1s f t k k t k f k s k T ms ππ=≠⇒==≠= (b)11/s R T kb s ==(c)20.5B R kHz == 3. A ssume that an AM transmitter is modulated with a video testing signal given byt sin 5.03.0 m(t)1ω+-=, where f 1=4 MHz. Let A c =100. (a) Sketch the AM waveform.(b) What are the percentages of positive and negative modulation? (c) Evaluate the total average power. (d) Evaluate the peak envelope power. Solution:(a) m(t)= -0.3+0.5 sin ω1t f m = f 1 =4 MHz 100=C At t t S c ωωcos )sin 5.07.0(100)(1+⨯=(b)%20100100120.mod .pos %max =-=-=C C A A A%8010020100.mod .n %min =-=-=C C A A A eg(c)22norm 22121[1()]2100(0.70.5sin )21000.250.49307522c P A m t w t =<+>=⨯<+>⎡⎤=⨯+=⎢⎥⎣⎦ (d) 2.05.03.0)](max[=+-=t m7200)]2.01([21P 2PEP=+=c A4. C onsider a random data pattern consisting of binary 1’s and 0’s, where the probability of obtaining either a binary 1 or 0 is 1/2 and the duration of one symbol is ms 1T b =. Calculate the PSD for polar RZ signaling assuming peak values of V 1±.Solution ：f)f 105.0sin()f 105.0(Sa 105.0)2fT (Sa 2T f105.0)f 105.0sin(105.02/fT )2/fT sin(2T )f (F 333bb 333b b b ππ⨯=π⨯⨯=π=π⨯π⨯⨯=ππ=------222222b 24231(0)[][1(1)]121R(k)(11)0 where k 02|F(f)|(f)()T () 2.510(0.510)42bnj kfT k b b R E a R k e T fT Sa Sa f πϕππ∞=-∞--==+-=⎧⎫=-=≠⎨⎬⎩⎭===⨯⨯∑5. A ssume that 5,0() mv 0,otherwiset Ts t ≤≤⎧=⎨⎩ is a known signal, where 8T s μ=. For the case of white noise,(a) Find the impulse response of the matched filter. (b) F ind the optimal sampling time t 0.(c) Find the output of the matched filter when s(t) is sent. (d) P lot the output of the matched filter.Solution:（a ）The impulse response of the matched filter is06105,0810()()0,otherwise K t T t h t Ks t t -==⎧≤≤⨯=-=⎨⎩b. T he minimum time that we have to wait before the maximum signal level occurs at the filter output is 08t T s μ== And t 0 is the optimal sampling time.c. The output of the matched filter is-6-608-6-6-68()()()()()0, t<0 or t>16102525, 0t<810254001025, 810t 1610o t t s t h t s t s h t d d t d t τττττ∞-∞-=*=-⎛⨯==≤⨯ =⨯-⨯≤≤⨯⎝⎰⎰⎰ e. The output of the matched filter is shown as in the following figure.6. F or a binary baseband system , the received signal is5,0,for a binary 1() and T 1ms 5,0,for a binary 0V t T s t V t T +≤<⎧==⎨-≤<⎩Assume the channel noise is White Gaussian Noise with the PSD of60()10W/Hz 2n N P f -==. The block diagram of receiver is as followLet LPF has an equivalent bandwidth of B=4R and a unity gain . (a) Evaluate the optimum threshold V T. (b) E valuate the error bit probability for the data at the receiver output. ( P e can be represented by Q[.] ) Solution: 1255o o s V s V ==-()()125510(V)22o o Topts s V +-+===()(22121min2263()2Q Q 425Q Q 25512104110o o o e o o s s s P σσ--⎛⎛-== ⎝⎝⎛==⨯⨯⨯ ⨯⎝7. A ssume that the input signal power of LSSB receiver is 2W, as shown in the following Fig., and carrier frequency is 100MHz. If the bandwidth of modulating signal m(t) is 4MHz, and the PSD of noise for channel is 90/2210/N W Hz μ-=⨯,and coherent demodulation is used, please determine:(a) the transfer function of the ideal IF filter;(b) t he input ratio of signal power and noise power in N S )/(of the detector; (c) the ouput ratio of signal power and noise power out N S )/(of the detector.Solution:(a) in order to assure the signal to pass the IF filter, the bandwidth of IF filter is equal to that of the modulated signal, That is to say, B IF =B m =4MHz. thusotherwise MHz f MHz K H )01096()costant ()(≤≤⎩⎨⎧=ω (b) the power of input signal being W S i 2=, and the power of input noisebeingW f P B N n i 369T 10*32)10*4(*)10*2(*2)(2--===thus the input ratio of signal power and noise power 125)/(=in N S(c) because the G=1 for SSB, so 125)/(=out N S8. A binary baseband signal is passed through a multilevel modulated bandpass system. The wave shape of the binary baseband signal is rectangular, and the data rate is 50Mb/s. Evaluate(a) Assume that a QPSK signal is used to send the data. What is the absolute bandwidth of the QPSK signal? What is the null to null bandwidth of the QPSK signal? Is there AM component on the QPSK signal? (b) A ssume the baseband signal is pass through a raised cosine-rolloff filter with a 50% rolloff factor first, and then be transmitted using QPSK signal. What is the absolute bandwidth of the QPSK signal? What is thetransmission bandwidth of the QPSK signal? Is there AM component on the QPSK signal?(c) Assume the available channel bandwidth is 20MHz, and the rolloff factor is 50%. What is the minimum multilevel for the multilevel modulated signal? Solution1) The absolute bandwidth of the QPSK signal is ∞.For QPSK signal, 242lL l ==→= ThenulltonullbandwidthoftheQPSKsignalis22502null RB D MHz==⨯= There isn’t AM component on the QPSK signal.2) ()()50110.537.52T R B r MHz l =+=+= The absolute bandwidth and the transmission bandwidth of the QPSK signal are same, 37.5MHz .There is AM component on the QPSK signal.3) ()()min 50110.5 3.75420T R l r l B =+=+=→= The minimum multilevel is L=24=169. A ssume that the input data stream is {+1, -1, +1, +1, -1, -1, +1, -1, +1, +1, -1, +1, -1, +1, +1}, A c =1.(a) Plot the MSK type II modulation waveforms x(t) and y(t). (b) Let the period of carrier T c = T b /2, plot the BPSK signal s(t).。

电子科技英语试题及答案一、选择题（每题2分，共20分）1. Which of the following is not a feature of electronic components?A. High precisionB. High reliabilityC. Low power consumptionD. Large size答案：D2. What is the basic unit of digital information?A. BitB. ByteC. KilobitD. Megabyte答案：A3. In electronics, what does the term "analog" refer to?A. Continuous signalsB. Discrete signalsC. Digital signalsD. Binary signals答案：A4. Which of the following is not a type of semiconductormaterial?A. SiliconB. GermaniumC. PlasticD. Gallium arsenide答案：C5. What is the function of a transistor in an electronic circuit?A. To amplify signalsB. To store dataC. To convert light into electricityD. To filter signals答案：A6. What is the primary function of a capacitor in an electronic circuit?A. To block DC and allow ACB. To block AC and allow DCC. To store electrical energyD. To convert voltage into current答案：C7. What does the abbreviation "LED" stand for in electronics?A. Light Emitting DiodeB. Large Emitting DiodeC. Limited Emitting DiodeD. Low Emitting Diode答案：A8. What is the purpose of a resistor in an electronic circuit?A. To control voltageB. To control currentC. To store energyD. To amplify signals答案：B9. Which of the following is a type of passive component in electronics?A. TransistorB. DiodeC. RelayD. All of the above答案：D10. What is the term used to describe the flow of electric charge?A. VoltageB. CurrentC. ResistanceD. Capacitance答案：B二、填空题（每题2分，共20分）1. The smallest unit of electric charge is called an ________.答案：electron2. A ________ is a type of electronic component that can store energy in an electric field.答案：capacitor3. The process of converting sound into electrical signals is known as ________.答案：modulation4. In digital electronics, a ________ is a single digit number, either 0 or 1.答案：bit5. A ________ is a semiconductor device that can amplify or switch electronic signals and electrical power.答案：transistor6. The unit of electrical resistance is the ________.答案：ohm7. An ________ is a semiconductor device that allows current to flow primarily in one direction.答案：diode8. The ________ is a passive component that opposes the flow of alternating current.答案：inductor9. A ________ is a type of display device that uses liquid crystals to produce images.答案：LCD10. The ________ is a type of electronic component that can store data.答案：memory三、简答题（每题10分，共20分）1. Explain the difference between an analog and a digital signal.答案：Analog signals are continuous and can represent a wide range of values, while digital signals are discrete and can only represent specific values, typically as a series of ones and zeros.2. Describe the role of a microprocessor in a computer system. 答案：A microprocessor is the central processing unit of a computer system, responsible for executing instructions, performing calculations, and controlling other system components to perform various tasks.四、翻译题（每题15分，共30分）1. Translate the following sentence into English: “在电子设备中，晶体管通常用作放大器或开关。

电子通信专业英语答案【篇一：电子信息技术专业英语习题答案丁宁】=txt>4.(1)只要加很小的电压就能让电流流动的材料称为导体。

习题答案 exercise answerspart one electronicsunit 1 charge, current and voltage exercises1.(1)positive and negative particles(2)the time rate of change of charge(3)自由电子(4)potential difference(5)以随机的方式运动 2.(1)voltage(2)positive(3)negative(4)conductor(5)current3. (1)which ---atom(2)it---balloon(3)it---the unit of voltage, or potential difference(4)which---a wall or the ceiling(5)it---the charge of an electron is a negative one of1.60218x10-19 coulombs 4. (1)constitute(2)consists of(3)is composed of(4)makes up(5)constitute5. (1) an atom consists of a nucleus and electrons moving around it.(2)the motion of changes makes up current. (3)emf can do work on charges.unit 2semiconductor exercises1．(1)集成电路(2)半导体的导电性(3)positive type material semiconductor (4)正向偏压(5)每秒可完成上百万的简单指令操作 2．(1)---(a) (2)---(c) (3)---(b) (4)---(e) (5)---(d)3. (1)√ (2)x(3)x (4) √ (5) √（定语从句）(2)在我们所使用的所有能量中，最重要的是电能。

学院_______________________ 系别____________ 班次_____________ 学号__________ 姓名________________………….……密…..……….封……..……线………..…以………..…内………....答…………...题…………..无…….….效…..………………..电子科技大学《通信原理》期末考试（A 卷）1. 填空:1) PCM 编码的三个基本步骤 是__抽样_, ___量化__, __编码___. 2) 通信系统包含哪三个子系统: __发射机__ , 信道 and _接收机__. 3) 设模拟信号为 )1000042sin()(t t t s ππ+⨯=, 其最小抽样频率为 _20kHz_.4) 若数据速率是 100kbps,单极性 NRZ 信号, 双极性 NRZ 信号及Manchester NRZ 信号 的第一零点带宽分别为__100kHz___, __100kHz _, ___200kHz __.5) 对于无 ISI 得情形, 若升余弦滚降滤波器的6dB 带宽, f 0, 为 50kHz, 则通信系统的符号速率是 _100k _ baud.6) 若 AM 信号表达式为)100002cos()]42cos(5.01[5)(t t t s ⨯⨯+=ππ, 则该信号的复包络是_)]42cos(5.01[5)(t t g ⨯+=π_.7) 对于非均匀量化两个主要的压扩律 是: __u __律, ___A__律. 8) 设输入信号为 0()[cos][()-(-)] s t t t U t U t T . 当输入噪声为白噪声, 匹配滤波器的冲击响应为h(t)=___)]()())[(cos()(00000T t t U t t U t t t t +-----ω ___，最佳采样时刻为 =0t __T __.9) 若调制信号的带宽为 50kHz, 则AM 、DSB-SC 、SSB 信号的传输带宽分别为 _100kHz__, __100kHz__, __200kHz__.10) 若 s(t)的PSD 为 []22222)4(12cos 16)(f T fT T A f b b b c g -=ππp ,其第一零点带宽是 2. 设()m t 是 单极性 NRZ 信号，数据速率为 1000 bits/s (其峰值为 1V ,二进制 1 码或 0码 发生的概率均为 1/2). OOK 信号表达式为 ()()cos c c s t A m t t ω=, 其中1c A V =. (a) 计算 OOK 信号的PSD. 设载波频率为 10 KHz. (b) 画出OOK 信号的 PSD 并给出第一零点带宽的值. (c) 计算 OOK 信号的频谱效率.Solution:(a) ()()cos c c s t A m t t ω= , m (t )为单极性 ()()c g t A m t =()sin ()()b b b b fT t f t F f T T fT ππ⎛⎫=↔= ⎪⎝⎭∏22:01,2210,2c n n kn For k A a a a and I +=⎧⎪⎪===⎨⎪⎪⎩依概率依概率222111(0)()0222cn n i i c i AR a a P A ===⨯+⨯=∑:0For k ≠,()[][][]24cn n k n n k AR k E a a E a E a ++===()22,02,04c c A k R k A k ⎧=⎪⎪=⎨⎪≠⎪⎩ ()()()222221()1()4111()()444sin sin sin c b g n bb c b bbA T n bP f f T T bA T T b b f f T bbfT fT fT fT fT fT δδδππππππ∞=-∞⎡⎤=+-⎢⎥⎣⎦⎡⎤=+=+⎢⎥⎣⎦⎛⎫∑⎪⎝⎭⎛⎫⎛⎫⎪ ⎪⎝⎭⎝⎭3311/1010b T R ms === ()()221()[()()]41()()16sin ()sin ()()()s g g c c b bc cP f P f f P f f c b c b T T f f f f c b c b f f T f f T f f T f f T δδππππ=-+--⎡⎤⎢⎥=++-++⎢⎥⎢⎥⎣⎦-+⎛⎫⎛⎫ ⎪ ⎪-+⎝⎭⎝⎭(b)2null B KHz =(c) 1/1//22null R Kb s b s Hz B KHz η===3. 某模拟信号，其带宽为3400Hz ，要在一个 PCM 系统中传输。

电科英语3考试试题及答案第一部分：听力理解（共30小题，每小题1分，满分30分）第一节:听下面5段对话或独白。

每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。

听完每段对话或独白前，你将有5秒钟的时间阅读每个小题。

听完后，每个小题将给出5秒钟的作答时间。

每段对话或独白读两遍。

(Textbook, Page 3)1. What is the woman’s favorite food?[A] Salad.[B] Pizza.[C] Barbecue.2. What does the man advise the woman to do?[A] Take a rest.[B] Drink some water.[C] Go to the hospital.3. What does the woman think of the dinner?[A] It was too expensive.[B] It was very delicious.[C] She didn’t like it.4. What is the man going to do?[A] Call a computer company.[B] Install some software.[C] Buy a new computer.5. Where does this conversation most probably take place?[A] At a hotel.[B] At a library.[C] At a post office.第二节:听下面5段对话或独白。

每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。

听完每段对话或独白前，你将有5秒钟的时间阅读每个小题。

听完后，每个小题将给出5秒钟的作答时间。

每段对话或独白读两遍。

(Textbook, Page 4)6. What have the speakers been talking about?[A] A party.[B] A movie.[C] A trip.7. What is the man doing now?[A] Buying some magazines.[B] Waiting for a taxi.[C] Reading a book.8. When did the man become interested in photography?[A] When he was in college.[B] A few years ago.[C] Since he was a child.9. What did the woman do in her previous job?[A] She was a teacher.[B] She was a secretary.[C] She was a chef.10. What are the speakers mainly talking about?[A] Clothes.[B] Music.[C] A concert.第三节:听下面一段对话。

电子科技大学22春“电子信息工程”《通信原理》作业考核题库高频考点版（参考答案）一.综合考核(共50题)1.信源信息速率是4000bit/s，采用QPSK传输时符号速率是()k波特。

A、0.5B、1C、2D、4参考答案：C2.编码信道包括()。

A.调制信道B.调制器C.编码器和译码器D.解调器参考答案：ABD3.传输速率为9600B的二进制数码流，所需的最小传输带宽为()。

A. 3.2kHzB. 4.8kHzC. 1.6kHzD. 9.6kHz参考答案：B4.任何一个采用线性调制的频带传输系统，总可以由一个等效的基带传输系统所替代。

()A.错误B.正确参考答案：B5.调制信道的传输特性不好将对编码信道产生影响，其结果是对数字信号带来()A.噪声干扰B.码间干扰C.突发干扰D.噪声干扰和突发干扰参考答案：B6.信道中加性噪声来源有()。

A、人为噪声B、自然噪声C、热噪声D、散粒噪声参考答案：ABCD7.由香农公式可知连续信道的容量受“三要素”的影响，“三要素”是指()A.带宽、信号功率、信息量B.带宽、信号功率、噪声功率谱密度C.带宽、信号功率、传信率D.信息量、带宽、噪声功率谱密度参考答案：B8.直接调频法需要采用自动频率控制系统来稳定中心频率。

()A.对B.错参考答案：A9.将N路频率范围为0.1~4KHz的语音信号用FDM方式进行传输，则采用AM调制方式时N路语音信号B.4NKHzC.8KHzD.8NKHz参考答案：D10.脉冲编码调制(PCM)由哪几部分组成()。

A.抽样B.滤波C.量化D.编码参考答案：ACD11.一般说来，通过键控法得到二进制移频键控信号(2FSK)的相位(φn、θn)与序列n无关。

()A、错误B、正确参考答案：B12.对PCM30/32路基群系统，若抽样后均匀量化级数为N=256，同步信号已包含在编码内，信息传输速率为多少bps?()A.512KbpsB.1024KbpsC.2048KbpsD.4096Kbps参考答案：C13.HDB3码无直流分量，低频分量也很少，频带比较窄，是目前应用最多的码型之一。

2011 至2012 学年第1 学期《电子技术专业英语》试卷（A ）1. There can be no doubt the 1900s is remembered as the electronic century.A. whichB. thatC. what2. Electrons, as one knows, are minute charge of electricity.A. negativeB. positiveC. reverse3. A resistor is an electrical component that the flow of electrical current.A. increasesB. changesC. resists4. Frequency is the reciprocal of the period, if the period is 4ms, then the frequency would be .A. 4m/sB. 0.25KHzC. 25Hz5. The sixth power of two is .A. 12B. 36C. 646. A capacitor will block current, but appears to pass current by charging and discharging.A. DC…ICB. AC…DCC. DC…. AC7. For a 4-band resistor with “color code”, the first band is the values.A. hundredsB. tensC. ten8. An electronic device often used for amplifying voltage and current is _____________.A. transistorB. conductorC. diode9. In a diode, current flows in ________ direction across the junction.A. only oneB. twoC. three10. A __________ amplifier provides signal amplification with little or no distortion, so that the output is proportional to the input.1.电压有效值（）2.微处理器（）3.电子元件（）4.公共端插孔（）5.外阻（）6.放大器（）7.脉冲直流（）8.电压源（）9.系统设计（）10.逻辑运算（）（1）internal resistance （2）pulsating DC （3）voltage sources（4）logic circuits （5）RMS voltage （6）logic operation（7）external resistance （8）number systems （9）Microprocessor（10）amplifier （11）common jack （12）digital logic circuits（13）system design （14）anode of diode （15）electrical components三、短语翻译（每小题2 分，共20 分）1. Passive electrical circuits2. Assembler language3. The address bus4. Analog multimeter5. Semiconductor material6. chip holders7. peak-to-peak voltage8. dual-trace oscilloscope9. Flowchart10. Signal generator1 / 4四、句子翻译（每小题5 分，共20 分）1. The impact of digital integrated circuits on our modern society has been pervasive. Without them, the revolution of current computer and information-technology would not exist.2. A multimeter is a general-purpose meter capable of measuring DC and AC voltage, current, resistance, and in some cases, decibels.3. When measuring current, the circuit must be opened and the meter inserted in series with the circuit or component to be measured.4. Moore's law, which predicted that the number of devices integrated on a chip would be doubled every two years, was accurate for a number of years.五、综合运用（每小题20分，共20 分）C is commonly considered to be a structured language with some similarities to Pascal. In C, a block of code is a logically connected group of program statements that can be treated as a unit. You can create a block of code by placing lines of code between opening and closing curly braces. For example:if(x<10){printf (“too low, try again”);reset_counter(-1);}The two statements after "if" that are between the curly braces are executed if x is less than10. These two statements with the braces represent a block of code. They are linked together:one of the statements cannot execute without the other also executing.(将上面的短文翻译成中文)2 / 43 / 42011 至2012 学年第 1 学期《 电子技术专业英语 》试卷（ A ）1. There can be no doubt the 1900s is remembered as the electronic century.A. whichB. thatC. what2. Electrons, as one knows, are minute charge of electricity.A. negativeB. positiveC. reverse3. A resistor is an electrical component that the flow of electrical current.A. increasesB. changesC. resists4. Frequency is the reciprocal of the period, if the period is 4ms, then the frequency would be .A. 4m/sB. 0.25KHzC. 25Hz5. The sixth power of two is .A. 12B. 36C. 646. A capacitor will block current, but appears to pass current by charging and discharging.A. DC …ICB. AC …DCC. DC …. AC7. For a 4-band resistor with “color code ”, the first band is the values.A. hundredsB. tensC. ten8. An electronic device often used for amplifying voltage and current is _____________.A. transistorB. conductorC. diode9. In a diode, current flows in ________ direction across the junction.A. only oneB. twoC. three10. A __________ amplifier provides signal amplification with little or no distortion, so that the output is proportional to the input.A. nonlinearB. linearC. electronic 1.电压有效值（ ） 2. 微处理器（ ） 3.电子元件（ ） 4.公共端插孔（ ） 5.外阻（ ） 6.放大器（ ） 7.脉冲直流（ ） 8.电压源（ ）9.系统设计（ ） 10.逻辑运算（ ）（1）internal resistance （2）pulsating DC （3）voltage sources （4）logic circuits （5）RMS voltage （6）logic operation （7）external resistance （8）number systems （9）Microprocessor （10）amplifier （11）common jack （12）digital logic circuits （13）system design （14）anode of diode （15）electrical components 三、短语翻译（每小题 2 分，共 20 分）1. Passive electrical circuits 无源电路2. Assembler language 汇编语言3. The address bus 地址总线4. Analog multimeter 模拟万用表5. Semiconductor material 半导体材料6. chip holders 芯片插座7. peak-to-peak voltage 电压峰-峰值8. dual-trace oscilloscope 双踪示波器 9. flowchart 流程图 10. signal generator 信号发生器1. The impact of digital integrated circuits on our modern society has been pervasive. Without them, the revolution of current computer and information-technology would not exist.数字集成电路对现代社会的影响是普遍深入的，没有数字集成电路，将不存在当代的计算机和信息技术革命。