Room Acoustics  book cover
5th Edition

Room Acoustics

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ISBN 9781315274850
Published October 8, 2018 by CRC Press
392 Pages

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Book Description

Since publication of the first edition in 1973, this professional and scientific reference has become the standard work in the field, providing detailed analysis of the state of the art in room acoustics.

It outlines the theory and practice of sound behaviour in enclosed spaces. Particular emphasis is given to the properties and calculation of reverberation, the most obvious acoustical feature of a closed room. Further key topics include the mechanisms of sound absorption and psychoacoustical factors, from which design parameters and figures of merit are derived. Two chapters are devoted to practical questions such as measurement techniques and the procedures of room acoustical design. The interaction between a room's acoustic properties and its electroacoustic systems is also considered, and refined systems for optimizing listening conditions in a room are presented.

This edition includes a new list of symbols, and updated sections include the measurement of the impulse response including a discussion of distortions, sound propagation as a diffusive process and scattering by wall irregularities.

Table of Contents

Some Facts on Sound Waves Sources and Hearing
Basic Relations, the Wave Equation
Pane Waves and Spherical Waves
Energy Density and Intensity, Radiation
Signals and Systems
Sound Pressure Level and Sound Power Level
Some Properties of Human Hearing
Sound Sources

Reflection and Scattering
Reflection Factor, Absorption Coefficient and Wall Impedance
Sound Reflection at Normal Incidence
Sound Reflection at Oblique Incidence
A Few Examples
Random Sound Incidence
Reflection from Finite-Sized Plane Surfaces
Scattering by Wall Irregularities

The Sound Field in a Closed Space (Wave Theory)
Formal Solution of theWave Equation
Normal Modes in Rectangular Rooms with Rigid Boundaries
Non-Rigid Walls
Steady-State Sound Field
Frequency and Spatial Averaging
Decaying Modes, Reverberation

Geometrical Room Acoustics
Enclosures with Plane Walls, Image Sources
The Temporal Disturbation of Reflections
The Directional Disturbation of Reflections, Diffuse Sound Field
Enclosures with Curved Walls
Enclosures with Diffusely Reflecting Walls, Radiosity Integral

Reverberation and Steady State Energy Density
Basic Properties and Realisation of Diffuse Sound Fields, Energy Balance
Mean Free Path and Average Rate of Reflections
Sound Decay and Reverberation Time
The Influence of Unequal Pate Lengths
Application of the Radiosity Integral
Sound Propagation as a Diffuse Process
Coupled Rooms

Sound Absorption and Sound Absorbers
The Attenuation of Sound in Air
Unavoidable Wall Adsorption
Sound Asorption by Membranes and Perforated Sheets
Resonnace Adsorbers
Helmholtz Resonators
Sound Absorption by Porous Materials
Audiences and Seat Absorption
Miscellaneous Objects
Anecjoic Rooms

Subjective Room Acoustics
Some General Remarks on Reflections and Echoes
The Perceptibility of Reflections
Echoes and Colouration
Early Energy: Definition, Clarity Index, Speech Transmission Index
Reverberation and Reverberance
Sound Pressure Level, Strength Factor
Spaciousness of Sound Fields
Assessment of Concert Hall Acoustics

Measuring Techniques in Room Acoustics
General Remarks on Instrumentation
Measurement of the Impulse Response
Examination of the Impulse Response
Measurement of Reveberration
Sound Absorption—Tube Methods
Sound Absorption—Reverberation Chamber
Scattering Coefficient

Design Considerations and Design Procedures
Direct Sound
Examination of the Room Shape
Reverberation Time
Prediction of Noise Level
Acoustical Scale Models
Computer Simulation

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Heinrich Kuttruff is Emeritus Professor at the Institute of Technical Acoustics at Aachen University, Germany.


‘The author strikes a balance between theory and practice as both come through in this text. Overall, this book comes across as highly readable and the material is practical enough to be readily applicable.’Noise Control Engineering Journal