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Subject Sound reduction index(transmission loss)
Date
Mon Sep 22 2003 15:32
Author Tor Erik Vigran
(vigran@tele.ntnu.no)
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The sound transmission loss for the combination of layers is calculated in the normal way from the tranmission coefficient, i.e. the ratio between the transmitted and the incident intensity in a plane wave at any angle with the surface. Certainly, there are infinite spaces on both sides of the specimen. The diffuse option calculates the average transmission in the range 0 - 80 degrees. The latter one you may compare with measured data from transmission rooms but be aware that the influence of a finite surface is not accounted for. Calculating the transmission with a hard wall backing has no meaning as the hard wall is infinitely stiff.
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