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A new way of measuring the lateral energy fraction

✍ Scribed by Mendel Kleiner

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
295 KB
Volume
27
Category
Article
ISSN
0003-682X

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✦ Synopsis

A method to measure the lateral energy fraction of the early reflection pattern of a room ( Ly ) is presented. The method allows a correct cos ~ response as well as the more commonly used cos z Β’k response. The method is based on the same dual-microphone technique which is used in intensity measurement. This means that equipment will be readily available in most laboratories. The evaluation is carried out using a digital FFT analyser. A flowchart for the analysis using a FFT analyser as well as some test data are presented. Measurement data for different environments such as an anechoic room and a symphony hall are presented. The data agrees with the predicted results.

REFERENCE

Barron, M. & Marshall, A. H., Spatial impression due to early lateral reflections in concert halls: derivation of a physical measure. J. Sound Vibr., 77 (1981 ) 211-32.

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