| Series Foreword | xiii |
| Preface | xv |
| 1 The Technology of Communications | 2 |
| 1.1 Social Changes | 2 |
| 1.2 Political Effects | 2 |
| 1.3 Transportation | 3 |
| 1.4 Manufacturing | 3 |
| 1.5 Service Industries | 3 |
| 1.6 Entertainment | 4 |
| 1.7 Factors in Decisions about a New Technology | 4 |
| 1.8 Measuring Information--A Central Concept | 5 |
| 1.9 The Plan of the Book | 6 |
| 2 Messages without Errors | 7 |
| 2.1 Redundancy in Language | 8 |
| 2.2 Spelled Speech | 9 |
| 2.3 Communicating Numbers | 9 |
| 2.4 Digital Root | 11 |
| 2.5 Casting Out Nines | 13 |
| 2.6 Transmission with Error Correction | 14 |
| 2.7 Hamming Code | 16 |
| 2.8 Bar Codes | 20 |
| 2.9 Universal Product Code | 23 |
| Appendix 2.1 Telephone Numbers | 33 |
| Review Questions | 44 |
| Problems | 45 |
| 3 Electrical Safety | 52 |
| 3.1 Basic Concepts of Electricity | 52 |
| 3.2 Lightning | 59 |
| 3.3 Home Electrical Energy | 62 |
| 3.4 Shockfrom a Toaster | 69 |
| 3.5 Electrical Effects on People | 73 |
| Appendix 3.1 Scientific Notation | 82 |
| Appendix 3.2 One Problem in Human Experimentation | 83 |
| Review Questions | 85 |
| Problems | 87 |
| 4 The Building Blocks of Signals | 94 |
| 4.1 Sine Signals | 94 |
| 4.2 Concept of Frequency | 99 |
| 4.3 Sound Signals | 103 |
| 4.4 Human Communication | 107 |
| 4.5 More Complex Signals | 109 |
| 4.6 Uses of Spectrograms | 113 |
| 4.7 Personal Verification | 116 |
| 4.8 Sound Signals of All Types | 121 |
| 4.9 Spectrum and Spectrogram | 128 |
| 4.10 Many Signals through One System | 133 |
| 4.11 Testing Automobile Engines | 137 |
| Review Questions | 139 |
| Problems | 141 |
| 5 Resonance | 145 |
| 5.1 Free Response | 145 |
| 5.2 Forced or Driven Response | 147 |
| 5.3 Systems with Multiple Resonances | 154 |
| 5.4 Uses of Resonance | 159 |
| 5.5 An Application of Resonance | 163 |
| 5.6 Computer Speech | 165 |
| 5.7 Problems of ASR | 167 |
| 5.8 Generation of Human Speech | 168 |
| 5.9 Example of ASR | 172 |
| Review Questions | 173 |
| Problems | 174 |
| 6 The Engineer Looks at Hearing | 181 |
| 6.1 The "Black Box" Approach to Hearing | 183 |
| 6.2 Frequency Response of Human Hearing | 185 |
| 6.3 Sensitivity of Human Hearing | 188 |
| 6.4 Audiometry | 193 |
| 6.5 Other "Black Box" Characteristics | 194 |
| 6.6 The Stethoscope | 201 |
| 6.7 Parts of the Ear | 204 |
| 6.8 Outer Ear | 206 |
| 6.9 Middle Ear | 208 |
| 6.10 Inner Ear | 210 |
| Review Questions | 213 |
| Problems | 214 |
| 7 Digital Signals | 223 |
| 7.1 A Tactile Communication System | 224 |
| 7.2 Morse Code | 227 |
| 7.3 Sampling | 228 |
| 7.4 Quantizing | 235 |
| 7.5 Coding | 236 |
| 7.6 Breaking the USPS Code | 238 |
| 7.7 Limits of Human Communication | 242 |
| 7.8 Digital Audio | 244 |
| Review Questions | 251 |
| Problems | 252 |
| 8 Signals through Space | 261 |
| 8.1 Light | 262 |
| 8.2 Other Electromagnetic Signals | 265 |
| 8.3 Biological Effects of High-Frequency Electromagnetic Signals | 271 |
| 8.4 Biological Effects of Non-lonizing Radiation | 271 |
| 8.5 Standards for Exposure | 274 |
| 8.6 Project Sanguine-Seafarer-ELF | 278 |
| 8.7 A Natural Resource Gone | 287 |
| Appendix 8.1 EMP (Electromagnetic Pulse) | 291 |
| Review Questions | 295 |
| Problems | 296 |
| 9 Radio | 305 |
| 9.1 Radio Signals | 308 |
| 9.2 Frequencies for Radio | 310 |
| 9.3 Modulation | 313 |
| 9.4 Some Radio History | 314 |
| 9.5 Amplitude Modulation, or AM | 318 |
| 9.6 Geographical Coverage of a Radio Station | 324 |
| 9.7 Speech Scramblers | 327 |
| 9.8 Frequency Modulation, or FM | 330 |
| 9.9 Radio Navigation | 335 |
| 9.10 Radar | 342 |
| 9.11 Radar Countermeasures | 350 |
| 9.12 Police Radar | 351 |
| Review Questions | 355 |
| Problems | 357 |
| 10 Medical Ultrasonic Imaging | 367 |
| 10.1 Echolocation | 368 |
| 10.2 Sonar for Submarine Detection | 369 |
| 10.3 Echoes from the Body | 371 |
| 10.4 Basic Equipment | 375 |
| 10.5 Health Effects | 380 |
| 10.6 Conclusion | 383 |
| Review Questions | 383 |
| Problems | 384 |
| 11 Television | 387 |
| 11.1 Telecommunication of a Picture | 389 |
| 11.2 Structure of the Video or Picture Signal | 390 |
| 11.3 Other Video Structures | 399 |
| 11.4 History of Television | 402 |
| 11.5 Chromaticity Diagram | 406 |
| 11.6 Human Color Vision | 408 |
| 11.7 Color Television | 414 |
| Appendix 11.1 Human Vision | 418 |
| Review Questions | 436 |
| Problems | 438 |
| 12 Broadcasting and Narrowcasting | 457 |
| 12.1 Video Signal | 458 |
| 12.2 Broadcast Signal | 461 |
| 12.3 TV Broadcasting | 464 |
| 12.4 Digital Television | 466 |
| 12.5 Unconventional TV Broadcasting | 468 |
| 12.6 Cable TV | 471 |
| Review Questions | 474 |
| Problems | 475 |
| Index | 483 |