Cover image for Audio electronics
Audio electronics
Hood, John Linsley.
Personal Author:
Second edition.
Publication Information:
Oxford [England] ; Boston : Newnes, 1999.
Physical Description:
xi, 375 pages : illustrations ; 24 cm
General Note:
Includes index.
Format :


Call Number
Material Type
Home Location
Item Holds
TK7881 .H66 1999 Adult Non-Fiction Non-Fiction Area

On Order



Audio Electronics is a unique electronics text in that it focuses on the electronics of audio design and explores the principles and techniques that underly the successful design and usage of analog and digital equipment.

The second edition includes new material on the latest developments in the field: digital radio and television, Nicam 728, and the latest Dolby noise reduction systems.

John Linsley Hood is responsible for numerous amplifier designs that have led the way to better sound, and has also kept up a commentary on developments in audio in magazines such as The Gramophone, Electronics in Action and Electronics World.

Author Notes

John Linsley Hood (1925-2004) was head of the electronics research laboratories at British cellophane, for nearly 25 years. He worked on many instrumentation projects including width gauges and moisture meters, and made several inventions which were patented under the Cellophane name. Prior to his work at British Cellophane he worked in the electronics laboratory of the Department of Atomic Energy at Sellafield, Cumbria. He studied at Reading University after serving in the military as a radar mechanic. Linsley Hood published more than 30 technical feature articles in Wireless World magazine and its later incarnation Electronics World. He also contributed to numerous magazines including Electronics Today.

Table of Contents

Prefacep. xi
1 Tape recordingp. 1
The basic systemp. 1
Magnetic tapep. 1
The recording processp. 4
Causes of non-uniform frequency responsep. 7
Record/replay equalisationp. 9
Head designp. 12
Recording track dimensionsp. 18
HF biasp. 19
The tape transport mechanismp. 25
Transient performancep. 26
Tape noisep. 27
Electronic circuit designp. 30
Replay equalisationp. 34
Bias oscillator circuitsp. 36
The record amplifierp. 39
Recording level indicationp. 41
Tape drive motor speed controlp. 42
Professional recording equipmentp. 42
General descriptionp. 43
Multi-track machinesp. 47
Digital recording systemsp. 48
2 Tuners and radio receiversp. 57
Backgroundp. 57
Basic requirementsp. 57
The influence of the ionospherep. 58
Why VHF transmissions?p. 63
AM or FM?p. 64
FM broadcast standardsp. 66
Stereo encoding/decodingp. 66
GE/Zenith 'pilot tone' systemp. 66
PCM programme distribution systemp. 70
Supplementary broadcast signalsp. 75
Alternative transmission methodsp. 75
SSB broadcastingp. 76
Radio receiver designp. 79
Circuit designp. 114
New developmentsp. 116
Appendicesp. 117
3 Preamplifiers and input signalsp. 119
Requirementsp. 119
Signal voltage and impedance levelsp. 119
Gramophone pick-up inputsp. 120
Input circuitryp. 123
Moving coil PU head amplifier designp. 127
Circuit arrangementsp. 128
Input connectionsp. 135
Input switchingp. 136
4 Voltage amplifiers and controlsp. 140
Preamplifier stagesp. 140
Linearityp. 140
Noise levelsp. 149
Output voltage characteristicsp. 150
Voltage amplifier designp. 151
Constant-current sources and 'current mirrors'p. 154
Performance standardsp. 159
Audibility of distortionp. 162
General design considerationsp. 168
Controlsp. 169
5 Power output stagesp. 189
Valve amplifier designsp. 189
Early transistor circuitsp. 192
Listener fatigue and crossover distortionp. 192
Improved transistor amplifier designsp. 195
Power MOSFETsp. 196
Output transistor protectionp. 201
Power output and power dissipationp. 203
General design considerationsp. 206
Slew-rate limiting and TIDp. 207
Advanced amplifier designsp. 211
Alternative design approachesp. 219
Contemporary amplifier design practicep. 227
Sound quality and specificationsp. 229
6 The compact disc and digital audiop. 233
Why use digital techniques?p. 233
Problems with digital encodingp. 234
The record-replay systemp. 239
The replay systemp. 245
Error correctionp. 260
7 Test Instruments and measurementsp. 265
Instrument typesp. 266
Signal generatorsp. 266
Alternative waveform typesp. 277
Distortion measurementp. 284
Oscilloscopesp. 294
8 Loudspeaker crossover systemsp. 305
Why necessary?p. 305
Cone designp. 306
Soundwave dispersionp. 309
Crossover system designp. 309
Crossover component typesp. 315
LS output equalisationp. 316
Active crossover systemsp. 317
Active filter designp. 319
Bi-wiring and tri-wiringp. 322
9 Power suppliesp. 324
The importance of the power supply unitp. 324
Circuit layoutsp. 326
Circuit problemsp. 328
Full-wave rectifier systemsp. 328
Transformer types and power ratingsp. 332
Stabilised PSU circuitsp. 333
Commercial power amp. PSUsp. 337
Output source impedance and noisep. 338
Transformer noise and stray magnetic fieldsp. 341
10 Noise reduction techniquesp. 342
Bandwidth limitationp. 342
Pre-emphasisp. 343
'Noise masking' and 'companding'p. 343
Attack and decay timesp. 344
Signal level limitingp. 345
Gramophone record 'click' suppressionp. 345
Proprietory noise reduction systemsp. 346
Digital signal processing and noise reductionp. 349
11 Digital audio broadcastingp. 352
Broadcasting system choicesp. 352
Digital radio and TV: the growth of complexityp. 354
Phase shift modulation systemsp. 355
Avoidance of time delay distortionp. 356
DAB transmitter and receiver layoutsp. 357
The NICAM-728 TV stereo sound systemp. 359
The NICAM-728 audio signalp. 360
Sound qualityp. 363
Further readingp. 363
Indexp. 365