Combination of acoustical radiosity and the image source method.

Georgios I Koutsouris, Jonas Brunskog, Cheol-Ho Jeong, Finn Jacobsen

Research output: Contribution to journalJournal articleResearchpeer-review


A combined model for room acoustic predictions is developed, aiming to treat both diffuse and specular reflections in a unified way. Two established methods are incorporated: acoustical radiosity, accounting for the diffuse part, and the image source method, accounting for the specular part. The model is based on conservation of acoustical energy. Losses are taken into account by the energy absorption coefficient, and the diffuse reflections are controlled via the scattering coefficient, which defines the portion of energy that has been diffusely reflected. The way the model is formulated allows for a dynamic control of the image source production, so that no fixed maximum reflection order is required. The model is optimized for energy impulse response predictions in arbitrary polyhedral rooms. The predictions are validated by comparison with published measured data for a real music studio hall. The proposed model turns out to be promising for acoustic predictions providing a high level of detail and accuracy.
Original languageEnglish
JournalAcoustical Society of America. Journal
Issue number6
Pages (from-to)3963-3974
Publication statusPublished - 2013


  • Acoustic wave reflection
  • Architectural acoustics


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