In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 82, No. S1 ( 1987-11-01), p. S45-S45
Abstract:
After a review of various calculation methods currently available for free-field deviation (in Db) in an anechoic room, the authors present, in this paper, a more precise and rational calculation of the sound field by solving wave equations in consideration of the interference of first reflections only. In the case of pure tone, the phase factor plays an important role in the calculation; therefore, the free-field deviation (in Db) calculated also depends on the source position, measuring direction and distance from the source, and the frequency used in the test, besides other factors such as the dimensions of the room and sound absorption characteristics of all the boundary surfaces. For a broadband noise, the calculation becomes simpler since the phase factor can be ignored, and a general equation of such a calculation is given for any source position and different combinations of boundary absorption. The results of the calculation can be shown in a diagram with the aid of a microcomputer, and, hence, a three-dimensional free-field scope would be very useful as a guideline to design and to use an anechoic room.
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
1987
detail.hit.zdb_id:
1461063-2
detail.hit.zdb_id:
219231-7
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