MEASURED EARLY LATERAL ENERGY FRACTIONS IN CONCERT HALLS AND OPERA HOUSES
✍ Scribed by M. BARRON
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 373 KB
- Volume
- 232
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
In the 30 years since early lateral re#ections were "rst suggested as important for concert halls, spatial impression and source broadening have become almost universally accepted as essential characteristics of halls with good acoustics. Two objective measures of source broadening have been proposed. Measured values of the best de"ned of these measures, the early lateral energy fraction (¸F), are considered here. Results from two independent measurement surveys are discussed. Comparisons of ¸F values by hall show a signi"cant link between hall mean ¸F and hall width. There is however considerable overlap between measured ¸F values in di!erent halls so the relevance of describing halls by their mean early lateral energy fraction values is questionable. The behaviour of ¸F values within auditoria is discussed for di!erent concert hall plan forms and within opera houses. A measure of source broadening including sound level is proposed and results considered in the context of auditorium design.