In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 85, No. 3 ( 1989-03-01), p. 1206-1212
Abstract:
After a review of various calculation methods currently available for free-field deviation (in dB) in an anechoic room, a more precise and rational calculation of the sound field is presented in this article by solving wave equations including the interference of first reflections only. In the case of a pure tone, the phase factor plays an important role in the calculation; therefore, the calculated free-field deviation (in dB) also depends on the source position, measuring direction and distance from the source, and the frequency used in the test in addition to other factors such as the dimensions of the room and sound absorption characteristics of all of the boundary surfaces. For a broadband noise, calculation becomes simpler as 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, as a map of free-field range within a given maximum deviation. This is 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:
1989
detail.hit.zdb_id:
1461063-2
