An hybrid beam and particle tracing with time dependant radiosity for accurate impulse response of rooms prediction

Nicolas Noe (1) , Christophe Rougier (1) , Jeremy Rouch , Isabelle Schmich (1)

1 CSTB - Centre Scientifique et Technique du Bâtiment

Ray-tracing is widely used for echograms prediction in room acoustics. Several ray-based technics exist, each of them with pros and cons. In this paper we propose a method that merges beam tracing, particle tracing and time dependant radiosity in order to compute accurate impulse responses. This method mixes advantages of each technique: precise direct and early specular reflections (and even diffraction) with phase information for beam tracing, mixed diffuse and specular contributions and late reverberation for particle tracing, smooth purely diffuse exchanges with radiosity. Our method builds the impulse response from pressure FRF (narrow band) computed with beam-tracing and pseudo-echograms (wide band) computed with particle tracing and radiosity, using signal-processing. It carefully avoids contribution overlapping between the three techniques.

Mots clés: article tracing; radiosity; impulse response prediction

Domaines: Acoustique [physics.class-ph]

Nicolas Noe, Christophe Rougier, Jeremy Rouch, Isabelle Schmich. An hybrid beam and particle tracing with time dependant radiosity for accurate impulse response of rooms prediction. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811280⟩