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Vol 26 No 3

CONTENTS

December 1998


ARTICLES

What is Surround Sound?
Glenn Dickins
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Calibration and Interpretation of Acoustic Backscatter Measurements Of Suspended Sediment Concentration Profiles In Sydney Harbour
L.J. Hamilton
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Towards a Normative Model of Public Policy for Environmental Noise
Andrew Hede
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What is Surround Sound?

Glenn Dickins
Telecommunications Engineering
Australian National University
Canberra ACT 0200

Vol. 26, No. 3 pp 81-85 (1998)
ABSTRACT: Surround sound now appears as a feature on a myriad of consumer audio products. Much confusion exists regarding the function and capabilities of such systems. This article discusses the range of 'surround sound' systems available and explains two fundamental principles of operation. This leads to a discusion of the capabilities and limitations of current systems and likely future trends.

Calibration and Interpretation of Acoustic Backscatter Measurements Of Suspended Sediment Concentration Profiles In Sydney Harbour

L.J. Hamilton
Aeronautical and Maritime Research Laboratory,
Defence Science & Technology Organisation (DSTO),
P.O. Box 44, Pyrmont, New South Wales 2009, Australia

Vol. 26, No. 3 pp 87-93 (1998)
ABSTRACT: An 0.5 MHz acoustic backscatter CABS) device developed and manufactured by Shanghai Acoustics Laboratory was used to infer vertical profiles of suspended sediment concentration (SSC) in Sydney Harbour. Dynamic suspension events induced by shipping, e.g. mobile suspension clouds caused by bottom stirring, were observed in real-time as images on a PC screen. ABS instruments have only been developed in the last decade and are not in widespread use. They have the advantage of being able to rapidly measure high resolution temporal and spatial SSC profiles remotely and non-intrusively, and thereby to image suspension processes. Time series of raw backscatter profiles can be obtained and displayed in real-time at the temporal and spatial scales of suspension processes, making ABS devices far superior to traditional point sampling methods using water bottles and optical instrumentation. Acoustic theory for this class of instrument is briefly outlined, and simple modelling is carried out to provide background information and to examine possible calibration methods. Of particular interest is the development of routine methods to calibrate ABS instruments in the field.

Towards a Normative Model of Public Policy for Environmental Noise

Andrew Hede
University of the Sunshine Coast
Maroochydoce
Queensland, 4558

Vol. 26, No. 3 pp 95-100 (1998)
ABSTRACT: Environmental noise regulations can be analysed in terms of the public policy process used to develop and implement them. The policy process is best viewed as occurring in a series of stages and as being acted out by a range of different players. The role of 'technofficials' varies from totally controlling to fully facilitative. These two approaches are compared in terms of a technofficial-centred model and a collaborative model of the noise policy process. Two case studies from different Australian jurisdictions are compared. It is argued that the collaborative model of public policy is more appropriate and results in more effective noise control regulation.

 

Newsflash

PROPOSED INTERNATIONAL YEAR OF SOUND 2019

Let's make 2019 the International Year of Sound!

Click here to see draft prospectus. Suggestions for major activities that would be truly international to strengthen the application are welcomed.

 

ACOUSTICS 2017

Perth, Western Australia 19-22 November 2017