电子信息与通信工程专业英语lesson3

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电子与通信工程专业英语Unit 3 Integrated Circuit

9பைடு நூலகம்
4．Datasheets Datasheets are available for most ICs giving detailed information about their ratings and functions. In some cases example circuits are shown. The large amount of information with symbols and abbreviations can make datasheets seem overwhelming to a beginner, but they are worth reading as you become more confident because they contain a great deal of useful information for more experienced users designing and testing circuits.
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Fig 3.1 Pin numbers
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If you need to remove a chip it can be gently prised out of the holder with a small flat- blade screwdriver. Carefully lever up each end by inserting the screwdriver blade between the chip and its holder and gently twisting the screwdriver. Take care to start lifting at both ends before you attempt to remove the chip, otherwise you will bend and possibly break the pins.

电子通讯专业英语UnitIII

电子通讯专业英语unitiii xx年xx月xx日CATALOGUE 目录•Electromagnetic field and wave•Electromagnetic compatibility(EMC)•Electromagnetic pollution and its controlCATALOGUE目录•Electromagnetic shielding materials andits application•Electromagnetic pulse(EMP) and its effect on electronic equipment01Electromagnetic field and waveDefinition and classification of electromagnetic field and waveElectromagnetic field Electromagnetic waveEM field in communi…EM field is essential in communication system, such as EM field generated by antenna for signal transmission, EM field generated by microwave resonator for signal processing, etc.Electromagnetic wav…Electromagnetic field and wave in communication systemApplication of electromagnetic field and wave in communication systemEM field application Electromagnetic waveap…Electromagnetic compatibility(EMC)1EMC and its impact on electronic equipment 23电子设备的性能可能会受到电磁干扰（EMI）的影响，导致设备出现故障、异常或性能下降。

电子信息类专业英语Unit3 Electrical Technique

Unit 3 EΒιβλιοθήκη ectrical Technique
Operational Amplifiers ❖ Single-ended ❖Differential（差分） amplifiers ❖Inverting（反相） input ❖ the non-inverting input.
Unit 3上E一le页ctrica下l T一ec页hniqu返e 回
Unit 3 Electrical Technique
Passage A Analog Circuit Passage B Binary System and Logic Systems Passage C Magnitude Locked Loop
Unit 3 Electrical Technique
Impedance
Load resistor In series with Short circuit
Current
filter
Oscillator
Comparator
amplification
Invert
Saturation
Unit 3 Electrical Technique
2.Terminology
❖ “固态”的意思是当晶体管切换状态时，它的物理形式不发生变化。晶体管中不存在可以移动的部分。
Unit 3 Electrical Technique
Transistor vs. vacuum tube
❖ Compared to the vacuum tube , transistors were much smaller, faster, and cheaper to manufacture. They were also far more reliable and used much less power.

通信英语课文UNIT3

通信英语课文UNIT3UNIT 3Communication with Data数据通信Data signals are transmitted over various types of telephone circuits.数据型号在各种类型的话路上传输They travel on wire from telephone pole to telephone pole, through underground cables, from mountain top to mountain top over microwave facilities, on the ocean floor in submarine cables, and via communications satellites from continent to continent.它们通过导线从一跟电杆传到另一个电杆;它们经过地下电缆传送;它们通过微波设备从一个山头传到另一个山头;它们通过海底电缆,通过卫星,从一个洲传到另一个州.Some type of data conversion equipment is required to change the digital machine signals to a form suitable for transmission over these facilities.为了把数字化机器信号变换为适合在这些设备中传输的信号形式,需要使用某种类型的数据变换设备.The data machine which provides an input to the transmit section of the conversion equipment,or modulator, can be a keyboard, printer, card reader, paper tape terminal computer or magnetic tape terminal.向变换设备发送部分(即调制器)提供输入的数据设备可以是键盘、打印机、卡片阅读器、纸带终端计算机或磁带终端机。

《精品课件》电信英语UnitⅢ-13

时刻；同步
• bus [bʌs] n. [计]（电脑的）总线 • Ethernet ['i:θə,net] n. 以太网 • latency ['leitənsi] n. 潜伏；潜在因素 • integrate ['intiɡreit] v.使一体化；使集成 • instrumentation [,instrumen'teiʃən] n. 仪器
bVIEW is a graphical programming language from National Instruments. LabVIEW programs are called
virtual instruments often abbreviated to VIs.
LabVIEW：是美国国家仪器公司（National Instruments NI）1986年推出的图形化系统设计软件，现今，数以百万的工程师和科学家可以使用LabVIEW来构建他们的测试、测量与控制系统。
2.Real world signals are of analogue nature, while a computer is a digital instrument. Real world signals：现实世界的信号现实世界的信号是模拟信号，而计算机是数字仪器。
3.therefore the computer needs also interpreters – analogue-to-digital and digital-to-analogue converters for communication with the object. analogue-to-digital：模拟-数字，从模拟到数字 digital-to-analogue converter：数字-模拟转换器因此计算机与对象进行通信时需要进行转译－模数转换和数模转换，与被测对象进行通信。

电子信息与通信工程专业英语lesson2-3

First mixer
• This component translates all incoming signals in the RF frequency range into signals in some intermediate frequency range, depending on the local oscillator signal frequency. The mixer translates all frequencies linearly, preserving phase information within the new range of frequencies. Within some range of RF signal amplitudes, the amplitude of the output signal is also preserved on the IF. It requires low LO feed through to the RF and IF, and a large spurious-free dynamic range for the incoming RF signal. • The selection of the IF frequency is important in ensuring the receiver response to unwanted spurious responses is minimized. • IF frequencies from 45 to 82 MHz are common for mobile radio receivers in the 800-MHz band, and from 110 to 300 MHz for radios in the 1,800-MHz band or for both bands.

电子信息工程专业英语教程Lesson3Microprocessors

• 流水线是一种在前一条指令全部执行完之前就开始取下一条指令，以提高处理速度的技术。
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A brief summary of all Pentium families
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• Pentium 4 - Introduced in 2000 (1.4-3.4GHz)
Latest Pentium architecture started out with a 400MHz system bus and 256KB L2 cache (later increased to 800MHz and 2MB). The first models contained 42 million transistors, used the 0.18 micron process and came in 423pin and 478-pin PGA packages. Intel's first Pentium 4 chipset was the 850 and supported only Rambus memory (RDRAM), but subsequent chipsets switched to DDR SDRAM.
• Difference
– Transistors – Microns – Clock speed – Data width – MIPS
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Brief introduction
Intel 4004
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Pentium IV
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Brief introduction
Intel 4004
• Pentium II Xeon - 1998-1999 (400MHz-450MHz) Typically used in high-end and 2-way and 4-way servers, Xeon specs were like Pentium II with L2 cache from 512KB to 2MB and 100MHz system bus.

电子通信英语第三章.ppt

An unfortunate characteristic of all communication channels is that noise is added to the signal. This unwanted noise may cause distortions of sound in a telephone, or errors in a telegraph message or data.
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Unit 14 Basic Knowledge of Communications
All pulse systems depend on the analog waveform being sampled at regular intervals. The signal created by sampling our analog speech input is known as pulse amplitude modulation(as shown in Fig.3-3). It is not very useful in practice but is used as an intermediate stage towards forming a PCM signal. It will be seen later that most of the advantages of digital modulation come from the transmitted pulses having two levels only, this being known as a binary system. In PCM the height of each sample is converted into a binary number. There are three steps in the process of PCM: sampling, quantising and coding.

电子与通信技术专业英语Unit I-3

Unit Ⅰ Basic Knowledge of Electronics Lesson 3 AC, DC and Electrical Signals
New Words
• • • • • positive ['pɔzətiv] a. 正的 frequency ['frikwənsi] n. 频率 measure ['meʒə] v.n 测量 device [di'vais] n. 装置，设备 label ['leibl] n. 标ime graph on the fig.3-4 shows various properties of an electrical signal. voltage-time graph：电压时间曲线图3－4的电压－时间图显示了一个电信号的各种特性。
3.The diagram shows a sine wave but these properties apply to any signal with a constant shape. sine wave： n.正弦波 cosine wave： n.余弦波该图显示了一个正弦波，但这些特性适用于具有恒定形状的任何信号。
Lesson 3 AC, DC and Electrical Signals Alternating Current (AC) Alternating Current (AC) flows one way, then the other way, continually reversing direction. An AC voltage is continually changing between positive (+) and negative (-). The rate of changing direction is called the frequency of the AC and it is measured in hertz (Hz) which is the number of forwards-backwards cycles per second.

电子与通信工程专业英语Unit 3

Unit 3 The Transistor and It’s Basic Circuit
电子与通信工程专业英语
In the common-emitter connection，the signal is introduced into the base-emitter circuit and extracted from the collectoremitter circuit．This configuration has more moderate input and output impedance than the common-base circuit． The input (base-emitter) impedance is in the range of 20 to 5000 ohms， and output (collector-emitter) impedance is about 50 to 50000 ohms. Power gain in the order of 10,000 (or about 40dB) can be realized with this circuit because it provides both current gain and voltage gain．
Translation Reading More Translating skills Text
The Transistor and It’s Basic Circuit
Unit 3 The Transistor and It’s Basic Circuit
电子与通信工程专业英语
The Transistor and It’s Basic Circuit
在共发射极连接中信号从基一射回路输人从集一射回路输出与共基极连接相比这种结构有中等的输入和输出阻抗输入电阻约为20到5000欧姆输出电阻约为50到50000欧姆

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TEXT 3.2 Digital Signal Processing
1. Introduction 2. Fourier Analysis 3. FIR digital filter design 4. Window Functions
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Terminology
• fidelity n.保真度, (收音机, 录音设备等的) 逼真度, 保真度, 重现精度 • sensory adj.感觉的, 感官的 • seismic adj.[地]地震的 • vibrations n.振动, 颤动, 摇动, 摆动 • storage n.贮藏(量), 贮藏库, 存储 • superposition n.重叠, 重合, 叠合 • ubiquitous adj.到处存在的, (同时)普遍存在的 • utility n.效用, 有用
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• At present, many digital signal processing methods have been widely used in science and technology fields. So we take digital signal system for example, some system properties are described in next section.
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A continuous-time system is a system in which continuous-time input signals are applied and result in continuous-time output signals. As in Figure 3-1-5(a), where x(t) is the input, y(t) is the output, and h(t) is the system impulse response.
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• • • • • • • • • • •
physical adj. 自然的, 物理的 delay v.耽搁, 延迟, 延期, 迟滞 re-indexing 改变符号 oscillatory adj.摆动的 ripple n.波纹 transition n.转变, 转换, 跃迁, 过渡, 变调 Gibbs phenomenon. Gibbs现象 sub-optimum adj.未达最佳标准的 mainlobe n.主瓣 sidelobe n.旁瓣 attenuation n.衰减
T { x(n − n0 )} = y (n − n0 )
Linearity and time invariance are independent properties.
) ∗ y (n) = y (n) ∗ x (n)
Associative:
x ( n ) * y ( n ) * w ( n ) = x ( n ) * y ( n ) * w ( n )
②signals ③signals ①Signals
is those with finite average power
.
P∞
is the signals for which neither P nor ∞
E∞
are finite.
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EXERCISES
• 1. Please translate the following words and phrases into Chinese. • 2. Please translate the following words and phrases into English.
Chapter 3 Signal System & Signal Processing
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• 3.1 Signal and System • 3.2 Digital Signal Processing • 3.3 Speech Signal Processing
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TEXT 3.1 Signal and System
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• transformed by the system or cause the system to respond in some way, resulting in other signals as outputs. For example, a high-fidelity system takes a recorded audio signal and generates a reproduction of that signal. If the hifi system has tone controls, we can change the t on a l qu a lit y o f th e re p ro d u c e d sig n a l
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• 1. Continuous-time and discrete-time signals • 2. Continuous-time and discrete-time systems • 3. Some properties of digital signal system • 4. Signal energy and power
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• eg.2 a picture can be represented by brightness as a function of two spatial variables
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(⋅)
• To distinguish between continuous-time and discrete-time signals, we will use the symbol t to denote the continuous-time independent variable which is enclosed in parentheses (.) and n to denote the discrete-time independent variable in brackets [.].
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• Illustrations of a continuous-time signal and a discrete-time signal are shown in Fig.3-4.
• •
•
(a)
(b)
Fig. 3-4 Graphical representations of (a) continuous-time and (b) discrete-time signals
• Simply introduction of the mathematical representations of continuous-time and discrete-time signals and systems, and the concepts of signal energy and power.
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Terminology
• • • • • • • • • • • • aeronautics n.航空学, 航空术 astronautics n.太空航空学 seismology n.地震学 meteorologic adj.气象的, 气象学的 profile n.剖面, 侧面, 外形, 轮廓 convention n.大会, 协定, 习俗, 惯例 terminology n.术语学 electromechanical adj.[机]电动机械的,机电的,电机的 automotive adj.汽车的, 自动推进的 vehicle n.交通工具, 车辆 high-fidelity 高保真 tone n.音调, 音质, 语调
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2. Continuous-time and discrete-time systems
• Physical systems in the broadest sense are an interconnection of components, devices, or subsystems. In context ranging from signal processing and communications to electromechanical motors, automotive vehicles, and chemical-processing plants, a system can be viewed as a process in which input signals are
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1.Continuous-time and discrete-time signals • Signals are represented mathematically as functions of one or more independent variables: eg.1: a speech signal can be represented mathematically by acoustic pressure as a function of time
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• We can bring continuous-time and discrete-time systems together through the concept of sampling, and we can develop some insights into the use of discrete-time systems to process continuous-time signals that have been sampled.
Distributive:
x ( n ) * y ( n ) + w ( n ) = x ( n ) * y ( n ) + x ( n ) * w ( n )
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4. Signal energy and power