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发表于 22-4-2010 16:37:10
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8.5 Higher order wave types 156
8.6 Dispersion 162
9 Sound in closed spaces 166
9.1 Normal modes in a one-dimensional space 166
9.2 Normal modes in a rectangular room with
rigid walls 169
9.3 Normal modes in cylindrical and spherical
cavities 173
9.4 Forced vibrations in a one-dimensional
enclosure 174
9.5 Forced vibrations in enclosures of any shape 178
9.6 Free vibrations 182
9.7 Statistical properties of the transfer function 185
10 Sound waves in isotropic solids 189
10.1 Sound waves in unbounded solids 189
10.2 Reflection and refraction, Rayleigh wave 194
10.3 Waves in plates and bars 197
11 Music and speech 209
11.1 Simple and complex tones, noise 209
11.2 Pitch, intervals and scales 211
11.3 General remark on the function of musical
instruments 214
11.4 String instruments 215
11.5 Wind instruments 223
11.6 The human voice 228
12 Human hearing 233
12.1 Anatomy and function of the ear 234
12.2 Psychoacoustic pitch 239
12.3 Hearing threshold and auditory sensation area 243
12.4 Loudness level and loudness, critical
frequency bands 244
12.5 Auditory masking 248
12.6 Measurement of loudness 249
12.7 Spatial hearing 252
viii Contents
13 Room acoustics 257
13.1 Geometric room acoustics 258
13.2 Impulse response of a room 261
13.3 Diffuse sound field 264
13.4 Steady-state energy density and reverberation 268
13.5 Sound absorption 271
13.6 On the ‘acoustics’ of auditoria 277
13.7 Special rooms for acoustic measurements 280
14 Building acoustics 283
14.1 Characterisation and measurement of airborne sound
insulation 284
14.2 Airborne sound insulation of compound
partitions 287
14.3 Airborne sound insulation of single-leaf
partitions 289
14.4 Airborne sound insulation of double-leaf
partitions 296
14.5 Structure-borne sound insulation 301
15 Fundamentals of noise control 309
15.1 Noise criteria 310
15.2 Basic mechanisms of noise generation 311
15.3 Primary noise control 316
15.4 Secondary noise control 320
15.5 Personal hearing protection 331
16 Underwater sound and ultrasound 333
16.1 Acoustical detection and localisation of objects 333
16.2 Sound propagation in sea water 335
16.3 Strength of echoes 337
16.4 Ambient noise, reverberation 338
16.5 Transducer arrays 340
16.6 General remarks on ultrasound 342
16.7 Generation and detection of ultrasound 343
16.8 Diagnostic applications of ultrasound 345
16.9 Applications of high intensity ultrasound 349
16.10 Generation of high and highest ultrasound
frequencies 353
Contents ix
17 Electroacoustic transducers 359
17.1 Piezoelectric transducer 361
17.2 Electrostatic transducer 365
17.3 Dynamic transducer 368
17.4 Magnetic transducer 371
17.5 Magnetostrictive transducer 373
17.6 The coupling factor 375
17.7 Two-port equations and reciprocity relations 377
18 Microphones 379
18.1 Principles of microphones for airborne sound 379
18.2 Condensor microphone 382
18.3 Piezoelectric microphones 387
18.4 Dynamic microphones 389
18.5 Carbon microphone 391
18.6 Microphone directivity 392
18.7 Hydrophones 396
18.8 Vibration pickups 396
18.9 Microphone calibration 399
19 Loudspeakers and other electroacoustic sound sources 403
19.1 Dynamic loudspeaker 405
19.2 Electrostatic or condensor loudspeaker 408
19.3 Magnetic loudspeaker 410
19.4 Improvement of loudspeaker efficiency 411
19.5 Loudspeaker directivity 417
19.6 Earphones 419
19.7 Sound transmitters for water-borne sound and for
ultrasound 421
20 Electroacoustic systems 426
20.1 Stereophony 427
20.2 Sound recording 433
20.3 Sound reinforcement systems 443
Literature 451
Index 453 |
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