The paper is on the AES site. The authors tested using an electromagnetic model in MATLAB which is why they show frequencies in the MHz range.
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Diffuse Versus Non-Diffuse Energy and the Effect of Acoustic Diffusors
This paper discusses the effect of diffusers on the diffuse and nondiffuse sound energy in a room. The paper first defines diffuse versus nondiffuse energy, then presents a simple means of measuring it. It also discusses the effect of diffusers on the diffuse energy using a simple theoretical model. The paper presents simulations on an electromagnetic scale model of a reverberant room which show the beneficial effect of diffusers on diffuse versus nondiffuse energy ratio.
Authors: Angus, James A.; Clegg, J.; Marvin, A. C.; Dawson, J. F.
Affiliation: University of York, York, United Kingdom
AES Convention: 100 (May 1996) Paper Number: 4250
Publication Date: May 1, 1996
Subject: Architectural Acoustics and Sound Reinforcement