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WinFlag forum
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Subject Absorption coefissients
Date
Wed Jan 21 2004 19:35
Author Anders Buen
(anb@bs-akustikk.no)
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Thank you for your answer.
When measuring in a reverberation chamber the abs (Sabine) coefissient may be larger than 1. When calculating in a room acoustics software like ODEON or CATT the coefissient may not be larger than 1 of obvious reasons.
I wondered if there is a short way from absorption ceofissients from reverberation chamber measurements to the absorption coefissient that can be used for large surfaces and in e.g. ODEON.
I guess the correct absorption value to use in such a program is the statistical absorption coefissient. And I understand that this coefissient is not possible to measure directly.
However I found the explanation in your excellent user manual, and will look in the refernce there. I understand that there is no simple way from Sabine to statistical abs factor other than using the rather complex functions as given by Thomasson for a locally reactive absorber. The simplest way would be to use WinFlag on a porous model, but I would need good resistivity data.
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