The Age of Electronic MessagesMIT Press, 1990 - 487 lappuses What are the frontiers of today's communications technology? The Age of Electronic Messages explains the scientific principles on which this technology is based and explores its capabilities and limitations, its risks and benefits. In straightforward language accompanied by numerous illustrations, Truxal describes the communications technology that has become such an integral part of today's work and leisure. He provides accounts of the bar codes used in supermarkets and the postal system of the way signals are described in terms of frequencies and in digital form of hearing and audio systems, of radio and navigation, of medical imaging, and of television broadcasting and narrowcasting. Unlike other books on the subject, The Age of Electronic Messages takes into account the sociology of the new communications technology as well as its mathematical and physical underpinnings. John Truxal is Distinguished Teaching Professor in the Department of Technology and Society at the State University of New York at Stony Brook. The Age of Electronic Messages is included in the Alfred P. Sloan Foundation sponsored series, the New Liberal Arts. |
Saturs
1 Telephone Numbers | 33 |
Contents viii | 52 |
1 Scientific Notation | 82 |
Review Questions | 139 |
Review Questions | 173 |
The Engineer Looks at Hearing | 181 |
Review Questions | 213 |
Digital Signals | 223 |
3 | 313 |
12 | 351 |
Problems | 357 |
Medical Ultrasonic Imaging | 367 |
Problems | 384 |
1 Human Vision | 418 |
Review Questions | 436 |
Broadcasting and Narrowcasting | 457 |
Review Questions | 251 |
Signals through Space | 261 |
1 EMP Electromagnetic Pulse | 291 |
Radio | 305 |
Review Questions | 474 |
| 483 | |
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Bieži izmantoti vārdi un frāzes
amplitude antenna area code audio automation beam binary digits binary numbers bits per second broadcast cable called characteristics check digit color communication compact disc components detect device dial digital root disc distance eardrum echo effects electrical electromagnetic signals energy engineers equipment error example fork Fourier Fourier Theorem Frequency Hz hertz human hearing lens light listener measure microwave miles move noise normal operation percent person picture possible pressure problem pulse radar radiation radio signal radio stations range receiver represent resonant frequency resonant system retina sample satellite shown in figure shows sine signal sinusoidal sonar sound signal sound wave spectrogram spectrum speech signal speed stethoscope target telephone television temperature toaster transmitted Universal Product Code velocity vibration vision voltage volts wavelength wire words zero
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