In this paper we describe a method of calculation of the energy relations in halls where the existence of a non-uniform distribution of absorptive material in the room results in a non-diffuse sound field. The cases of halls used for concerts and speech have both been treated in order to derive new energy relations that yield known expressions when applied to a diffuse sound field. The importance of the initial reverberation time corresponding to the first portion of the decay has been verified showing that the main subjective parameters relating to the sound energy are influenced strongly by this portion, which is called the Early Decay Time if it is measured in the first 10 dB of the decay.
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References
1.
BarronM. & LeL-J.,(1988) “Energy Relations in Concert Auditoria”. J. Acoust Soc. Am. 84, 618–628
YoungR.W. (1959) “Sabine Reverberation Equation and Sound Power Calculations”. J. Acoust. Soc. Am. Vol 31, no. 7, 912–921
4.
RettingerM (1977) Acoustic Design and Noise Control Vol I Chemical Publishing Co Inc. New York
5.
CremerL. & MullerH.SchultzT. J. (1982) Principles and Applications of Room Acoustics. Vol 1. Appl Sci. Publishers
6.
YegnanarayanaB. & BalachandranC.G. (1972) Studies in a reverberation room with a highly absorbing sample. J.Acoust Soc Am. Vol 52,no. 2(part 1), 465–470
7.
Meyere ThieleR. (1956) “Raumakustische Untersuchungen in zahlreichen konzertsälen und rundfunkstudios unter amwendung neuerer messverfahren”. Acustica Vol.6. 425–444
8.
Meyere KuttruffH. & LauterbornW. (1967) “Modellversuche zur bestimmung des schallabsorptionsgrades im hallraum”. Acustica Vol 18, 21–32
9.
KnudsenV.O. & DelsassoL. P. & LeonardW. (1967) “Reverberation-room acoustics effects of various boundary conditions” J Acoust Soc Am. Vol 42,no. 5, 953–965.
10.
BagenalH. (1941) “Practical Acoustics and Planning against Noise” Methuen &Co Ltd., London
11.
ThieleR. (1953) Acustica 3, 291 To see Kuttruff.H.(1979) Room Acoustics Second edition Applied Science
12.
BeranekL. L. & SchultzT. J. (1965) Acustica Vol 15,307 (See also ref 5).
13.
Bose (1990) Guia de Diseño para sistemas de sonido professional Bose
14.
HoutgastT. & SteenekenH. (1985) “A review of the MTF concept in rooms Acoustics and its use for Estimating Speech Intelligibility in Auditoria” J Acoust Soc.Am, Vol 77, no. 3, January.
15.
ArauH.(1993) Internal Report (not published).
16.
BradleyJ. S. (1991) “A comparison of three classical concert halls” J.Acoust.Soc.Am Vol. 89, no. 3, March.
17.
BradleyJ.S (1994) “A comparison of Boston Symphony Hall with older North American Concert Halls. Proceedings of Wallace Clement Sabine Centennial Symposium. 2aAAa3, Page 195–198.
