PRINCIPLES OF SOUND FINN JACOBSE

BASIC PRINCIPLES OF ACOUSTICS

AND SOUND CONTROL

Finn Jacobsen, Torben Poulsen, Jens Holger Rindel,

Anders Christian Gade and Mogens Ohlrich

Department of Electrical Anatomist, Technical University or college of Denmark September 2011

Note not any 31200

2

CONTENTS

Webpage

1

An elementary summary of acoustics.................................................................... you Finn Jacobsen

1 . 1

Introduction.................................................................................................................... 1

1 . two

Fundamental audio concepts...................................................................................... one particular 1 . 2 . 1 Airplane sound ocean............................................................................................. 4 1 . 2 . two Spherical appear waves..................................................................................... 13

1 . a few

Acoustic measurements................................................................................................ 15 1 . 3. 1 Frequency examination........................................................................................... 15 1 . 3. 2 Levels and decibels......................................................................................... 18 1 . a few. 3 Noises measurement approaches and instrumentation....................................... 21

1 . 4

The idea of impedance............................................................................................ 28

1 . 5

Sound strength, sound strength, sound electrical power and audio absorption............................ 23 1 . 5. 1 The vitality in a appear field.............................................................................. thirty-two 1 . your five. 2 Audio absorption.............................................................................................. thirty five

1 . 6th

Radiation of sound....................................................................................................... thirty seven 1 . 6. 1 Point sources.................................................................................................... thirty seven 1 . six. 2 Appear radiation via a round piston within an infinite perplex............................. 42

1 . 7

Sources.................................................................................................................... 49

1 . 8

Bibliography................................................................................................................. 50

1 . 9

Appendix: Complex mention....................................................................................... 51

two

Ear, Hearing and Speech........................................................................................... 55 Torben Poulsen

2 . 1

Intro.................................................................................................................. 55

installment payments on your 2

The ear.......................................................................................................................... 55 2 . 2 . 1

installment payments on your 2 . two

The outer hearing..................................................................................................... 56 The center ear.................................................................................................. 56

iii

2 . 2 . 3 The inner headsets..................................................................................................... 57 installment payments on your 2 . some The consistency analyzer in the Basilar membrane............................................ 59 installment payments on your 3

Individual hearing............................................................................................................. 61 2 . three or more. 1

2 . 3. 2

2 . several. 3

2 . 4

The hearing tolerance....................................................................................... 61 Audiogram........................................................................................................ 62 Loudness level...

Sources: London, 1994.

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