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Optimum Reverberation Time for Auditoriums

 

作者: W. A. MacNair,  

 

期刊: The Journal of the Acoustical Society of America  (AIP Available online 1930)
卷期: Volume 1, issue 2A  

页码: 173-174

 

ISSN:0001-4966

 

年代: 1930

 

DOI:10.1121/1.1901899

 

出版商: Acoustical Society of America

 

数据来源: AIP

 

摘要:

Up to the present, the acoustics of auditoriums has rested on a purely empirical basis. A more satisfactory situation would be reached if we knew a physical quantity which had some definite value for all rooms, regardless of size, which are considered acoustically good. Such a condition is that∫t0t1 Lt dt = −32.6wheret0is the time a sustained source of sound,Ē, is cut off;t, the time the sound becomes inaudible: andLt, the loudness of the sound at any instantt. For a test tone of 1000 cycles we takeĒto be 35.3×1010cubic feet of sound of threshold density per second, which is a fair average of sources met with in practice. All rooms which have been considered acoustically good satisfy this condition. This implies that the ear is a ballistic instrument during the period of hang over of a sound, and suggests that rooms should be adjusted so that the loudness of all pure tones shall decay at the same rate, independent of frequency. The absorption material used must have a definite frequency characteristic to obtain this result. This characteristic turns out to be very near to that which an audience of people exhibits. An audience is recognized as being nearly ideal absorption material.

 

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