电子通信专业英语简明教程-全套PPT课件.pptx

PART 1 Technical English for Electronic Information EngineeringLesson 1 The Digital Age《电子通信专业英语简明教程》 2023/11/24电子通信专业英语简明教程2Lesson 1 The Digital Age Text tour Language in useVocabulary Structure Reading/writing techniques 2023/11/24电子通信专业英语简明教程3 Outline The Analog AgeBuilding Blocks for Analog Designs The Birth of the Digital AgeStill a Long Way To GoThe Transistor Replaced the Vacuum TubeThe Integrated Circuit (IC)Text tour 2023/11/24电子通信专业英语简明教程4Up until the middle of the 20th century, the technology designed by engineers was primarily analog …For example, analog audio records … The Analog Age 2023/11/24电子通信专业英语简明教程5Analog systems suffer from these shortcomings:Analog systems can be large.Analog systems can consume lots of energy.Analog systems are not easily modified …Analog systems are prone to breakdowns …The Analog Age 2023/11/24电子通信专业英语简明教程6 vacuum tube The vacuum tube is an electron tube from which all or most of the gas has been removed, permitting electrons to move with no or low interaction with any remaining gas molecules.Building Blocks for Analog Designs 2023/11/24电子通信专业英语简明教程7 Digital systems have many advantages: Numbers are much less sensitive to physical problems …Numbers are easier to store … Numbers can be moved through space …The Birth of the Digital Age 2023/11/24电子通信专业英语简明教程8During the middle of the 20th century, mathematicians and engineers discovered a process for converting physical quantities to numbers … This discovery was the mathematical foundation that gave birth to the digital age …The Birth of the Digital Age 2023/11/24电子通信专业英语简明教程9 Table 1.1 lists some analog devices and the corresponding digital devices. Which do you prefer to use?The Birth of the Digital Age 2023/11/24电子通信专业英语简明教程10 Figure 1.1 The first digital computer - ENIAC - produced in 1945Still a Long Way To Go 2023/11/24电子通信专业英语简明教程11 ENICmore than 17,000 vacuum tubes weighed 30 tonsfilled a 30-by- 50–foot room Just think of the heat produced by 17,000 light-bulbs