Unit 3 Electrical Technique 20 Passage AAnalog Circuit 20 Passage BBinary System and Logic Systems 26 Passage CMagnitude Locked Loop 30 Unit 4 Microelectronics 34 Passage AIntroduction to Microelectronics 34 Passage BThe Simple Atom, Conductors, Insulators and Semiconductors 37 Passage CDiode and Transistor 41 Unit 5 Auxiliary Storage 46 Passage ACD and CDROM 46 Passage BHard Disks and Optical Disks 50 Passage CIntroduction to CDROM 53 Unit 6 Electronic Communications 55 Passage AIntroduction to Electronic Communications 55 Passage BThe Principle of PCM 65 Passage CInformation Sources 71 Unit 7 Digital Modulation 82 Passage ADigital Modulation 82 Passage BBinary Modulated Bandpass Signaling 86 Passage CMultilevel Modulated Bandpass Signaling 92 Unit 8 Telecommunications 95 Passage AEvolution of Telecommunication Networks 95 Passage BTelecommunications 102 Passage CTelecommunications: A Brief Historical Review 109 Unit 9 Digital Signal Processing 112 Passage ABasic Concepts of DSP 112 Passage BDigital Signal Processors 118 Passage CComparison of DSP and ASP 124 Unit 10 Laser 128 Passage AWhat Is a Laser? 128 Passage BIntroduction: Supertool 131 Passage CLasers 135 Unit 11 Database 137 Passage ADatabase: A Better Way to Manage and Organize Data 137 Passage BDBMS and Data Independence, Integrity, Security 141 Passage CDatabase System and Three Data Models 144 Unit 12 ISDN 148 Passage AIntroduction of ISDN 148 Passage BISDN Multimedia Services 152 Passage CISDN Evolution and Its Benefits 156 Unit 13 科技英语写作基础 159 Unit 14 英语写作一般知识简介 168 Unit 15 Data Communications 179 Passage AData Communications 179 Passage BCharacteristics of Communications Channels 182 Passage CCommunication Equipment and Software 186 Unit 16 3rd Generation Mobile Communications 189 Passage ATDSCDMA-a 3G Radio Access Technology 189 Passage BSummary of the Main Parameters in WCDMA 197 Passage CPlanning Ahead: Technology Choices in a Complex World 200 Unit 17 Images and Televisions 204 Passage ADigital Image Fundamentals 204 Passage BCompression/Decompression Techniques 209 Passage CTelevision 214 Unit 18 Multimedia 216 Passage AWhat Is Multimedia 216 Passage BCharacteristics 219 Passage CMultimedia 225 Unit 19 Optical Fiber Communication 227 Passage AThe General System 227 Passage BAdvantages of Optical Fiber Communication 232 Passage CFiberoptics Communications 239 Unit 20 Different Types of Lasers 241 Passage ACrystal and Glass Lasers 241 Passage BLiquid Lasers, the Freeelectron Laser and the Xray Laser 245 Passage CGas Lasers 249 Unit 21 Modern Switching Technique 253 Passage AThe Principles of Digital Switching 253 Passage BCircuit Switching and Packet Switching 261 Passage CATM 267 Unit 22 Modern Digital Design 269 Passage AOverview of Modern Digital Design 269 Passage BElectronic Design with FPGAs 276 Passage CVHDL 281 Unit 23 Network 285 Passage AComputer Networks(1) 285 Passage BComputer Networks(2) 290 Passage CNetwork 301 Unit 24 Others 304 Passage ASatellite Fundamentals 304 Passage BMicrowave Radio System 308 Passage CIntroduction of Color Image Segmentation 312 参考译文 314 参考答案 349 参考文献 370