In room-acoustics modeling, the sound atmospheric attenuation is a critical phenomenon that have to be taken into account to obtain correct predictions, especially when high frequencies and large enclosures are simulated. A finite difference scheme implementation of the diffusion equation model with a mixed boundary condition is evaluated, including the air absorption within the room. This paper focus on investigate the performance of this implementation for room-acoustics simulation. In particular, the stability condition is developed to compare the features of the solution both with and without the air absorption term. Moreover, the correct behavior of the numerical implementation has been studied comparing predicted results using different surfaces and air absorption coefficients.

Authors: Navarro, Juan M.; Escolano, José; López, José J.
Affiliations: iTeAM Institute, Universidad Politecnica de Valencia, Valencia, Spain; Polytechnic Sciences Department, San Antonio's Catholic University of Murcia, Guadalupe, Spain; Telecommunication Engineering Department, University of Jaén, Linares, Spain(See document for exact affiliation information.)
AES Convention: 128 (May 2010) Paper Number: 8021
Publication Date: May 1, 2010
Subject: Room and Architectural Acoustics

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