Archives of Acoustics, 37, 2, pp. 171–180, 2012

Computing Reverberation Time in a 3D Room Model Using a Finite Difference Method Applied for the Diffusion Equation

Jarosław KRASZEWSKI
Chair of Acoustics, Institute of Telecommunication, Teleinformatics and Acoustics, Wrocław University of Technology

The article presents theoretical values of reverberation times calculated on the basis of the diffusion
equation for three room models: flat, cubic, and long. The article shows that not only the average absorp-
tion coefficient, but also location of the absorbent material, as well as the place where the time is counted
have an impact on the reverberation time, calculated on the basis of the diffusion equation. Despite that,
the diffusion model is based on statistical assumptions. The primary goal of the article was to show that
the model has geometrical features.
Keywords: diffusion method; reverberation time; finite differences method
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