Contents

Preface

CHAPTER 1   Introduction to Sound

1.1  Pressure Waves and Sound Transmission

1.2  Sound Intensity, Power and Pressure Level

1.3  Adding Sounds Together

1.4  The Inverse Square Law

1.5  Sound Interactions

1.6  Time and Frequency Domains

1.7  Analyzing Spectra

Bibliography

CHAPTER 2   Introduction to Hearing

2.1  The Anatomy of the Hearing System

2.2  Critical Bands

2.3  Frequency and Pressure Sensitivity Ranges

2.4  Loudness Perception

2.5  Noise-induced Hearing Loss

2.6  Perception of Sound Source Direction

References

CHAPTER 3   Notes and Harmony

3.1  Musical Notes

3.2  Hearing Pitch

3.3  Hearing Notes

3.4  Tuning Systems

References

CHAPTER 4   Acoustic Model for Musical Instruments

4.1  A “Black Box” Model of Musical Instruments

4.2  Stringed Instruments

4.3  Wind Instruments

4.4  Percussion Instruments

4.5  The Speaking and Singing Voice

References

CHAPTER 5   Hearing Timbre and Deceiving the Ear

5.1  What is Timbre?

5.2  Acoustics of Timbre

5.3  Psychoacoustics of Timbre

5.4  The Pipe Organ as a Timbral Synthesizer

5.5  Deceiving the Ear

References

CHAPTER 6   Hearing Music in Different Environments

6.1  Acoustics of Enclosed Spaces

6.2  Room Modes and Standing Waves

6.3  Absorption Materials

6.4  Diffusion Materials

6.5  Sound Isolation

6.6  The Effect of Room Boundaries on Loudspeaker Output

6.7  Reduction of Enclosure Diffraction Effects

References

Further Reading

CHAPTER 7   Applications: Acoustics and Psychoacoustics Combined

7.1  Critical Listening Room Design

7.2  Pure-Tone and Speech Audiometry

7.3  Psychoacoustic Testing

7.4  Filtering and Equalization

7.5  Public Address Systems

7.6  Noise-reducing Headphones

7.7  “Mosquito” Units and “Teen Buzz” Ring Tones

7.8  Audio Coding Systems

7.9  Summary

References

Further Reading

APPENDIX 1  The Fourier Transform

A1.1  Fourier’s Theorem

A1.2  Fourier Analysis

A1.3  The Complex Fourier Series

A1.4  Frequency Analysis of Non-periodic Signals:

The Fourier Transform

A1.5  The Convolution Theorem

A1.6  A Fourier Transform Example:

The Single Pulse

A1.7  The Discrete Fourier Transform

APPENDIX 2  Solving the ERB Equation

APPENDIX 3  Converting between Frequency Ratios and Cents

APPENDIX 4  Deriving the Reverberation Time Equation

APPENDIX 5  Deriving the Reverberation Time Equation for Different Frequencies and Surfaces

APPENDIX 6  The Effect of Speaker Size on its Polar Pattern

A6.1  An Array of Point Sources

A6.2  Application to Diffuser Design

A6.3  Application to Array Loudspeakers

A6.4  Application to Constant Directivity Horns

A6.5  The Effect of Mouth, or Array, Size on Beamwidth

References

Further Reading

APPENDIX 7  Track Listing for the Audio Compact Disc

Index

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