Influence of the scattering and absorption coefficients on homogeneous room simulations that use a diffusion equation model

The diffusion equation model was used for room acoustic simulations to predict the sound pressure level and the reverberation time. The technical literature states that the diffusion equation method accurately models the late portion of the room impulse response if the energy is sufficiently scatter...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2013-03, Vol.133 (3), p.1218-1221
Main Authors: Navarro, Juan M, Escolano, José, Cobos, Maximo, López, José J
Format: Article
Language:English
Subjects:
Absorption
Acoustics
Computer Simulation
Diffusion
Facility Design and Construction - methods
Models, Theoretical
Motion
Numerical Analysis, Computer-Assisted
Pressure
Scattering, Radiation
Sound
Time Factors
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Summary:The diffusion equation model was used for room acoustic simulations to predict the sound pressure level and the reverberation time. The technical literature states that the diffusion equation method accurately models the late portion of the room impulse response if the energy is sufficiently scattered. This work provides conclusions on the validity of the diffusion equation model for rooms with homogeneous dimensions in relation to the scattering coefficients of the boundaries. A systematic evaluation was conducted out to determine the ranges of the absorption and scattering coefficient values that result in low noticeable differences between the predictions from a geometrical acoustic model and those from the diffusion equation model.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.4789928