Angular Distribution: Analysis in Acoustics (Lecture Notes in Engineering)

Stephen M. Baxter; Christopher L. Morfey

ISBN 10: 0387162208 / ISBN 13: 9780387162201

Published by Springer Verlag, 1986

About this Item

xlibrary copy 1986 rebound paperback withdrawn stamp in book/ on edge of pages clean text has book plate 202 pages::: J-1.

Seller Inventory # 1025IX2LTOJ

Bibliographic Details

• Title: Angular Distribution: Analysis in Acoustics (Lecture Notes in Engineering)
• Publisher: Springer Verlag
• Publication Date: 1986
• Language: English
• ISBN 10: 0387162208
• ISBN 13: 9780387162201
• Binding: Soft cover
• Condition: Used: Good

About this title

Synopsis

The purpose of this book is to j.ir ' 0l'l' a new technique for the experimental investigation of the free wave model sound field of acoustics. The technique is based on the use of spherical harmonic functions of angle. Acousticians frequently encounter random sound fields whose properties may be closely modelled by use of the "free wave" field. This model field is defined by two basic statistical stationarity in time, and homogeneity in space. Stationarity means that any single order statistic measured by a microphone in the field will be independent of the time at which the recording is taken, while homogeneity means that the measurement will also be independent of the mic- phone's position in the field. Furthermore, second order statistics obtained from the measurements of two microphones will depend only on the time lapse between the two recordings, and the relative spatial separation of the micro phones, and not on the microphones' absolute positions in space and time. The free wave field may also (equivalently) be pictured as a collection of plane sound waves which approach an observation position from all angles. These are the "free waves" of the title, with no correlation between waves at different angles and frequencies, although there may exist an angle-dependant plane wave density function. This is a measure of the density of sound energy arriving from different angles. The free wave field has proved to be a simple but remarkably powerful model.