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Vol 24 No 1

CONTENTS

April 1996


ARTICLES

Acoustical Feature Extraction from Aircraft and Traffic Noise
R Mohajeri and F R Fricke
PDF Full Paper

The Didjeridu (Didgeridoo)
N Fletcher
PDF Full Paper

Literature Review of Impact Noise Reduction In the Sheet Metal Industry
D M Eager and H M Williamson
PDF Full Paper

Underwater Acoustic Noise Levels In Lake Cethana
D R Edwards, E O'Brien and I Edmondson
PDF Full Paper

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Acoustical Feature Extraction from Aircraft and Traffic Noise

R. Mohajeri* and F. R. Fricke**
*Department of Mechanical and Mechatronic Engineering,
University of Sydney, NSW 2006 Australia
**Department of Architectural and Design Science, University
of Sydney, NSW 2006 Australia

Vol. 24, No. 1 pp 5-10 (1996)
ABSTRACT: For the purpose of developing a real-time transportation noise recognition system, a variety of acoustical features and statistical models of signals are reviewed. Finding an appropriate acoustical criteria to discriminate between several types of environmental noise is the goal of the present paper. The main emphasis is put on the discrimination of transportation noise, music and speech. The results could be used in transportation noise activated systems for the "intelligent" monitoring and control of aircraft and motor vehicle noise.

The Didjeridu (Didgeridoo)

Neville Fletcher
Research School of Physical Sciences
Australian National University
Canberra ACT 0200

Vol. 24, No. 1 pp 11-15 (1996)
ABSTRACT: The didjeridu of tile Australian aboriginal people is an ancient and deceptively simple instrument, consisting of a length cut from a narrow tree trunk or branch and hollowed by the successive action of fire and termites. Skilled players, however, are able to produce a wide repertoire of interesting musical effects including a rhythumic drone, striking timbre changes, and sounds that are voiced as well as played. This paper outlines the passive acoustics of the didjeridu tube, the active acoustics of the sound-production process, and the mechanisms by which the various musical effects are produced.

Literature Review of Impact Noise Reduction In the Sheet Metal Industry

D.M.Eager and H.M. Williamson
Acoustics and Vibration Centre, University College, University of New South Wales
Australian Defence Force Academy, Canberra, ACT, Australia, 2600

Vol. 24, No. 1 pp 17-23 (1996)
ABSTRACT: In the sheet metal industry, high levels of impact noise are associated with the frequent occurrence of noise induced hearing loss in wolkers. A literature review is presented of research on impact noise from punch and power presses in this industry. The review shows that considerable work has been done, and that much is understood about, the noise generation mechanisms in these machines. While more fundamental research will undoubtedly produce greater insight, there is a need for much more design and development work to produce quieter machines and processes for the sheet metal industry.

Underwater Acoustic Noise Levels In Lake Cethana

David R Edwards, Edward O'Brien and lain Edmondson
Australian Maritime Engineering
Cooperative Research Centre
Launceston Node
PO Box 986, Launceston, Tasmania 7250, Australia

Vol. 24, No. 1 pp 25-27 (1996)

 

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