电子通讯的发展-英语ppt
合集下载
通信与电子信息科技英语 总ppt课件
ity of a random process in
the same way.
Exercises
6. It is of interest to inquire whether G(f) defined in Eq. (1.2) for a random process has a physical significance whichcorresponds to the physical significance of G(f) for deterministic waveforms. 8. Hence, if we should select some sample function, a knowledge of the value of n(t) at time t would be of no assistance in improving our ability to predict the value attained by that same sample function at time t+τ. 9. Hence,whenever we make an observation or measurement of the pulse waveform which extends over a duration long enough so that the average observed pulse shape,such as their amplitudes,widths,and spacings are representative of the waveform generally,we shall find that Eq.(1.12)applies.
Exercises
《精品课件》电信英语UnitⅣ-18
as easily as：“像……一样(容易)”，easily 修饰动词made，充当状语。请比较：Our classroom is as big and bright as theirs (形 容词big and bright充当表语)。
2. This capability to exchange information on a
句中be it a telephone call or a news story：这是 一个倒装句，完整的句子应是……, whatever it is
a telephone call or a news story ……
3. …… that stretches back to an era when the term satellite was only an idea
7. Simply stated a satellite in a geostationary orbital position appears to be fixed over one portion of the earth.
句中simply stated：“简单地说”，相当于 simply speaking，请比较: generally speaking (总地来说)。
conceived by a few inspired individuals.
(1) that引导定语从句，修饰dream；(2) to stretch back：“回顾、追溯”，相当于to recall back；(3) an era：这里应指全球卫 星通讯系统仍在人们头脑中灵感的想象年 代，其后有when引导的定语从句修饰。
街区
• global ['ɡləubəl] a. 球形的, 全球的, 全世界的
2. This capability to exchange information on a
句中be it a telephone call or a news story：这是 一个倒装句，完整的句子应是……, whatever it is
a telephone call or a news story ……
3. …… that stretches back to an era when the term satellite was only an idea
7. Simply stated a satellite in a geostationary orbital position appears to be fixed over one portion of the earth.
句中simply stated：“简单地说”，相当于 simply speaking，请比较: generally speaking (总地来说)。
conceived by a few inspired individuals.
(1) that引导定语从句，修饰dream；(2) to stretch back：“回顾、追溯”，相当于to recall back；(3) an era：这里应指全球卫 星通讯系统仍在人们头脑中灵感的想象年 代，其后有when引导的定语从句修饰。
街区
• global ['ɡləubəl] a. 球形的, 全球的, 全世界的
G通讯的发展与应用趋势英文版ppt
with 2G in a reverse direction Providing multimedia services, with the rate of up to 2Mbps
– Vehicle environment: 144kbps – Environment for walk: 384kbps – Indoor environment: 2Mbps
User1
example, WCDMA and
TDMA
Frequency
CDMA2000
ห้องสมุดไป่ตู้
……
User 2 User 10 User 1 User 9
Frequency
Traffic channels at different time slots are allocated to different users, for example, DAMPS and GSM
Globally universal frequency band and standard, global seamless coverage
Highly effective spectrum efficiency Higher quality of service, security and reliability Easy to smoothly develop and transit from 2G, compatible
each be used
Understand the IMT-2000 system
Operator
Different Period, Different Requirement
Earlier Requirement Current Requirement New Requirement
– Vehicle environment: 144kbps – Environment for walk: 384kbps – Indoor environment: 2Mbps
User1
example, WCDMA and
TDMA
Frequency
CDMA2000
ห้องสมุดไป่ตู้
……
User 2 User 10 User 1 User 9
Frequency
Traffic channels at different time slots are allocated to different users, for example, DAMPS and GSM
Globally universal frequency band and standard, global seamless coverage
Highly effective spectrum efficiency Higher quality of service, security and reliability Easy to smoothly develop and transit from 2G, compatible
each be used
Understand the IMT-2000 system
Operator
Different Period, Different Requirement
Earlier Requirement Current Requirement New Requirement
电子信息与通信工程专业英语l课件
Signal processing presence patterns
Sampling and Quantization
Sentence Pattern: "In digital signal processing, sampling and quantification are essential steps in converting analog signals into digital form."
Description: This pattern is used to describe the basic components of electronic devices, emphasizing their importance in the overall structure and function
Electronic Information Sentence Patterns
01
Circuit Theory and Analysis
02
Sentence Pattern: "In analog circuits, voltage is the primary control parameter, while in digital circuits, it is the current."
Description: This pattern focuses on the application of low pass filters in signal processing, explaining their role in noise reduction and frequency selectivity
电子通讯专业英语Unit-III-5
Chinese Translation of Texts
第17课 无线传感器网络（WSN）
无线传感器网络（WSN）由空间上分布的自主式传感器组成，用以监控物理或 环境条件，如温度，声音，压力等，并通过网络将数据合成到一个主位置。更现代 的网络是双向的，也能够控制传感器的活动。无线传感器网络的发展是出于军事上 的应用，如战场监视.今天这样的网络被用于许多工业和消费类应用，如工业过程 监测和控制，机器状况监测等。
Chinese Translation of Texts
A sensor node might vary in size from that of a shoebox down to the size of a grain of dust. The cost of sensor nodes is similarly variable, ranging from a few to hundreds of dollars, depending on the complexity of the individual sensor nodes. Size and cost constraints on sensor nodes result in corresponding constraints on resources such as energy, memory, computational speed and communications bandwidth. The topology of the WSNs can vary from a simple star network to an advanced multi-hop wireless mesh network.
电子与通信技术专业英语
电子通讯专业英语UnitII
bluetooth
近场通讯技术是一种近距离无线通讯技术，通过将两个设备靠近在一起实现数据传输和通讯。
nfc
全球移动通信系统是一种无线通讯技术标准，采用数字调制方式进行数据传输，具有较高的保密性和容量。
gsm
ห้องสมุดไป่ตู้
tcp/ip协议
网络通讯技术
http协议
smtp协议
pop协议
异步通讯
异步通讯是指在通讯过程中不同步传输数据，具有较低的可靠性和较慢的传输速度。
电子通讯技术
dsl
数字用户线是一种常见的有线通讯技术，利用电话线上传和下载数据，具有传输距离远、速率高等优点。
ethernet
以太网是有线局域网的标准协议，通过传输介质（如双绞线、光纤等）将多台计算机连接在一起，实现数据传输和资源共享。
TOKEN RING
令牌环网是一种早期的局域网技术，通过传递令牌的方式实现数据的传输，具有较高的安全性和可靠性。
医疗健康
电子通讯技术在智能制造领域的应用将更加深入，实现工厂自动化、智能化，提高生产效率。
电子通讯技术在医疗健康领域的应用将更加广泛，如远程医疗、健康监测等，提高医疗保健水平。
03
电子通讯应用领域发展趋势
02
01
未来电子通讯产业将更加集群化，形成以龙头企业为主导的产业生态系统，带动整个产业的发展。
电子通讯硬件词汇
Cable
Transmitter
Receiver
Fiber opt…
01
02
Protocol
协议，是一组规则和标准，用于在计算机网络中传输数据。
TCP/IP
传输控制协议/互联网协议，是一种常用的网络通信协议，用于传输数据并在网络设备之间建立连接。
通信与电子信息科技英语课件unit11
传播路径 邻道 旁瓣
9. magnetic ferrites 10. klystron oscillator
磁性铁氧体
11. TE mode 12. TM mode 13. grazing angle 14. antenna tower
横电模(transverse electric mode) 横磁模(transverse magnetic mode) 入射余角
Microwave Radio Transmission
Microwave radio transmission media include propagation paths, antennas, and the waveguides used to couple the transmitters and receivers to the antennas. Comprehension of radio propagation and the path losses encountered, antenna patterns and efficiencies, and waveguide transmission characteristics are essential to an understanding of these media. For microwave transmission, portions of the 2 to 40 GHz spectrum are made available by the Federal Communications Commission for fixed, common carrier service. This range corresponds to wavelengths of 150 to 7.5 mm respectively where it is practicable to direct the
电子与通信专业英语Chapter Ⅱ Communication Technology
Radio communication was made possible by the invention of the triode during World War II. [2] It has subsequently become even more widespread and refined through the invention and use of the transistor, integrated circuits and other semiconductor devices.
[7] An unfortunate characteristic of all communication channels is that noise is added to the signal. 本句可译为：所有通信信道的一个 不好的特征是信号上都叠加了噪声。
a) An unfortunate characteristic of all communication channels为本句的主语， 中心词为charactb) that 引导一个表语从句。
Encoding modulation ( distortion ) ( distortion )
Decoding demodulation (distortion )
Information sou rce
Transmitter
Communication channel
Receiver
Destination
Noise source
Fig.2-1 Block Diagram of Communications System
(3) Communication Channel. The communication channel is the medium used to transmit the signal, from the transmitter to the receiver.
电子通讯的发展-英语ppt
务包括语音，传真，数据，多媒体娱乐和全球无缝漫游等)
3G technology with2MBPS standard user rate ( high speed mobile to provide144KBPS rate ).3G技术提供2MBPS标准用户速率（高速移动下提供144KBPS
速率）。
道固定卫星，而对手持终端，采用中低轨道的多颗星座卫星较为有利。
Tiangong-1
(Chinese: 天宫一号) is a Chinese space laboratory module,an experimental testbed to demonstrate the rendezvous and docking capabilities needed to support a space station complex. Launched unmanned aboard a Long March 2F/G rocket[1] on 29 September 2011, it is part of the Tiangong program, which aims to place a larger, modular station into orbit by 2020.
in modern time
光纤通信技术 optical fiber communications
多媒体通信Computer communication
Mobile satellite communication(卫星移动通信):
The use of satellite transponder signal can also be mobile communication, mobile communication can be used for the fixed satellite, and on the handheld terminal, using a low orbit satellite constellation is advantageous to the.利用卫星转发信号也可实现移动通信，对于车载移动通信可采用赤
3G technology with2MBPS standard user rate ( high speed mobile to provide144KBPS rate ).3G技术提供2MBPS标准用户速率（高速移动下提供144KBPS
速率）。
道固定卫星，而对手持终端，采用中低轨道的多颗星座卫星较为有利。
Tiangong-1
(Chinese: 天宫一号) is a Chinese space laboratory module,an experimental testbed to demonstrate the rendezvous and docking capabilities needed to support a space station complex. Launched unmanned aboard a Long March 2F/G rocket[1] on 29 September 2011, it is part of the Tiangong program, which aims to place a larger, modular station into orbit by 2020.
in modern time
光纤通信技术 optical fiber communications
多媒体通信Computer communication
Mobile satellite communication(卫星移动通信):
The use of satellite transponder signal can also be mobile communication, mobile communication can be used for the fixed satellite, and on the handheld terminal, using a low orbit satellite constellation is advantageous to the.利用卫星转发信号也可实现移动通信，对于车载移动通信可采用赤
电子信息专业英语(第二版)课件：Telecommunications
The golden age of automatic telephony occurred after World WarⅡwhen the entire long-distance network was automated. The invention of the transistor spurred the application of electronics to switching systems and led to the deployment of the first electronic switching in the late 1950s. Electronic switching made it possible to design and build switches with greater capacity.
Satellite communication was first proposed in 1945 by the British science fiction writer, Arthur C. Clarke. Satellite communications became a reality with the launching of the Russian satellite Sputnik (in 1957) and the American satellite Explorer (in 1958). The AT&T Telstar was the first experimental satellite capable of relaying television (TV) programs across the Atlantic Ocean. It was launched from Cape Canaveral(now Cape Kennedy)on July 1962. The first global civil communications satellite, INTELSAT Ⅰ(Early Bird), was launched in April 1965.
最新-电子信息类专业英语(西电第二版)Unit 6 Electronic Communications-PPT文档资料
~(t ) are concentrated m
about f =0; consequently, they are said to be baseband signals.
Unit 6 Electronic Communications
Figure 6.1 Communication System
Unit 6 Electronic Communications
Although the fundamental concepts and principles of electronic communications have changed little since their inception, the methods and circuits used to implement them have
Unit 6 Electronic Communications
Unit 6 Electronic Communications
Passage A Introduction to Electronic Communications Passage B The Principle of PCM Passage C Information Sources
undergone considerable change. In recent years, transistors and
linear integrated circuits have simplified the design of electronic communications circuits, thus allowing for miniaturization,
Unit 6 Electronic Communications
电子通信英语第一章.ppt
上一页 下一页 返回
Unit1 Basic concepts of circuit theory
Most circuits contain a mixture of series and parallel connections
The terms series circuit and parallel circuit are sometimes used, but only the simplest of circuits are entirely one type or the other. It is better to refer to specific components and say they are connected in series or connected in parallel.
上一页 下一页 返回
Unit1 Basic concepts of circuit theory
Digital systems contain devices such as logic gates, flip-flops, shift registers and counters. A computer is an example of a digital system.
上一页 下一页 返回
Unit1 Basic concepts of circuit theory
Current is measured in amps (amperes), A. A (1 amp) is quite a large current for electronics, so mA (milliamps) are often used. m (milli) means "thousandth": 1mA = 0.001A, or 1000mA = 1A
Unit1 Basic concepts of circuit theory
Most circuits contain a mixture of series and parallel connections
The terms series circuit and parallel circuit are sometimes used, but only the simplest of circuits are entirely one type or the other. It is better to refer to specific components and say they are connected in series or connected in parallel.
上一页 下一页 返回
Unit1 Basic concepts of circuit theory
Digital systems contain devices such as logic gates, flip-flops, shift registers and counters. A computer is an example of a digital system.
上一页 下一页 返回
Unit1 Basic concepts of circuit theory
Current is measured in amps (amperes), A. A (1 amp) is quite a large current for electronics, so mA (milliamps) are often used. m (milli) means "thousandth": 1mA = 0.001A, or 1000mA = 1A
《通信英语教程》课件
PPT courseware for Communication English
Course
目录
• Overview of the Communication Industry • Basic knowledge of communication English • Communication English Application Practice • Common Terminology in the
It involves effective speaking and listening skills to communicate technical information in meetings, seminars, or workshops.
Communication English in Contract Agreements
The Current Situation and Future Trends of the Communication Industry
Current situation
The communication industry is currently experiencing a digital transformation, with traditional media being eclipsed by new digital platforms.
The main business areas of the communication
industry
Broadcasting
This includes television and radio stations, which produce and transmit content to观众.
Course
目录
• Overview of the Communication Industry • Basic knowledge of communication English • Communication English Application Practice • Common Terminology in the
It involves effective speaking and listening skills to communicate technical information in meetings, seminars, or workshops.
Communication English in Contract Agreements
The Current Situation and Future Trends of the Communication Industry
Current situation
The communication industry is currently experiencing a digital transformation, with traditional media being eclipsed by new digital platforms.
The main business areas of the communication
industry
Broadcasting
This includes television and radio stations, which produce and transmit content to观众.
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.
上一页 下一页 返回
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.
上一页 下一页 返回
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.
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
Mars rover Curiosity blasts off 火星探测车：
NASA's Curiosity rover, rocketed toward Mars on November 26, 2011 on a search for evidence that the red planet might once have been home to itsy-bitsy life
务包括语音，传真，数据，多媒体娱乐和全球无缝漫游等)
3G technology with2MBPS standard user rate ( high speed mobile to provide144KBPS rate ).3G技术提供2MBPS标准用户速率（高速移动下提供144KBPS
速率）。
the Sixth sense demo device --------第六感演示装置
• The "flames of war" is a method of communication in ancient China used to pass the frontier military intelligence , began in the Shang and Zhou , until the Ming and Qing Dynasties , Frontier military fort or the height of the hub of every certain distance from buildings a high platform .
道固定卫星，而对手持终端，采用中低轨道的多颗星座卫星较为有利。
Tiangong-1
(Chinese: 天宫一号) is a Chinese space laboratory module,an experimental testbed to demonstrate the rendezvous and docking capabilities needed to support a space station complex. Launched unmanned aboard a Long March 2F/G rocket[1] on 29 September 2011, it is part of the Tiangong program, which aims to place a larger, modular station into orbit by 2020.
• China's recorded history , carrier pigeon is mainly used for the purpose of military communications . People tied the troop movements of the instrument with the pigeon
(4G是真正意义的高速移动通信系统，用户速率20MBPS。4G支持交互多 媒体业务，高质量影像，3D动画和宽带互联网接入，是宽带大容量的高 速蜂窝系统)
Maybe many students in our class is using 3G Phone .
in the future
comunicate with me ~~
电子通信的发展
2012.04.0 8
the ages of E-communication communication
in ancient time
in modern time
in the future
in ancient time
• In ancient times , China use drumming Transfer information first in the late primitive society . • Neat and heavy drums saying the intent of the Emergency and rhythm when the two armies atultimedia communication system, provides services including voice, fax, data, multimedia entertainment and global seamless roaming(3G是移动多媒体通信系统，提供的业
• Nowdays there are some mobile phones with its own CPU, RAM,ROM and Disk just like a PC,we call them samrtphones.Most smartphones have both 2G and 3G functions.The characteristics of 3G are video calls , high speed internet and high charge.
in modern time
光纤通信技术 optical fiber communications
多媒体通信Computer communication
Mobile satellite communication(卫星移动通信):
The use of satellite transponder signal can also be mobile communication, mobile communication can be used for the fixed satellite, and on the handheld terminal, using a low orbit satellite constellation is advantageous to the.利用卫星转发信号也可实现移动通信，对于车载移动通信可采用赤
4G is the true meaning of the mobile communication system, user rate20MBPS. 4G supports interactive multimedia service, high quality images, the 3D animation and broadband Internet access, broadband is the large capacity high-speed cellular system