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 |