Multi-dimensional analysis of subjective acoustical ratings and acoustical measures in existing concert halls
Identifieur interne : 000555 ( PascalFrancis/Checkpoint ); précédent : 000554; suivant : 000556Multi-dimensional analysis of subjective acoustical ratings and acoustical measures in existing concert halls
Auteurs : Toshiyuki Okano [Japon]Source :
- The Journal of the Acoustical Society of America [ 0001-4966 ] ; 2001-05-04.
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Abstract
Correlations between subjective acoustical ratings and hall-averaged values of acoustical measures are studied among existing worldwide major concert halls. It was shown that the classified acoustical ratings by Beranek [Concert and Opera Halls, How They Sound (ASA, 1996)] are discriminated correctly by combining binaural quality index (BQI) with some other acoustical measures. BQI is determined by the arithmetic average of inter-aural cross correlation coefficient in three octave bands of 500, 1000, and 2000 Hz, subtracted from unity, calculated from the early 80-ms part of binaural impulse response. Considering that the upper limit value of BQI not to cause disturbing image shift is approximately 0.85 at individual seat [Okano, J. Acoust. Soc. Am. 2219-2230 (2000)], the values of 0.6 or higher in hall averaged value of BQI, 0.85 or smaller in individual seat value of BQI, and approximately 5 dB or higher in strength factor at middle frequencies are proposed as design objectives to attain a high acoustical quality. It should be provided that other acoustical measures are also optimized. These target values will be very effective in studying room shape of halls, using scale models or computer models.
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