References of "Embrechts, Jean-Jacques"
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See detailDetermination of the scattering coefficient of random rough diffusing surfaces for room acoustics applications
Embrechts, Jean-Jacques ULg; Archambeau, Dominique; Stan, Guy-Bart

in Acta Acustica United with Acustica (2001), 87

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See detailBroad Spectrum Diffusion Model for Room Acoustics Ray-Tracing Algorithms
Embrechts, Jean-Jacques ULg

in Journal of the Acoustical Society of America (2000), 107(4), 2068-81

Geometrical acoustics methods have already been transformed to account for diffusely reflecting boundaries. In randomized ray-tracing algorithms, the sound rays are either specularly reflected or ... [more ▼]

Geometrical acoustics methods have already been transformed to account for diffusely reflecting boundaries. In randomized ray-tracing algorithms, the sound rays are either specularly reflected or scattered, according to the value of a random number which is compared with the diffusion factor. However, this method becomes inefficient if this factor depends on frequency, since the process must then be repeated for each frequency band. A method is proposed in this paper to compute all frequency components simultaneously in a single pass. The diffuse reflection model is based on the definition of a new concept: the "splitting coefficient," which can differ from the diffusion factor. First, the randomized ray-tracing method is described and the diffusion model is applied to a single diffusing surface in free field. It is shown that the results computed by the program are in accordance with theoretical results. Then, the method is shown to work properly when it is applied to more realistic enclosures: This is proved in theory and illustrated by some examples. A particular problem is the increase of the statistical error which has been solved by an appropriate control of the splitting coefficient. [less ▲]

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See detailL'éclairage : à nouveaux critères, nouveaux outils de mesure, de calcul et de simulation
Eugène, Christian; Rombauts, Patrick; Embrechts, Jean-Jacques ULg et al

in Revue de l'Electricité et de l'Electronique (2000), 7

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See detailSimulation of first and second order scattering by rough surfaces with a sound ray formalism
Embrechts, Jean-Jacques ULg

in Journal of Sound & Vibration (2000), 229(1)

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See detailModelling sound diffusion in ray tracing programs
Embrechts, Jean-Jacques ULg

in Proceedings of Acustica 2000-TecniAcustica Congress (2000)

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See detailUse of bidirectional reflectance distribution function in a particle tracing method
Dindart, Jean-François; Embrechts, Jean-Jacques ULg; Sémidor, Catherine

in Proceedings of the 2nd Convention Forum Acusticum (1999, March)

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See detailL'éclairage : une technique en évolution. De la performance visuelle à l'émotion
Eugène, Christian; Rombauts, Patrick; Embrechts, Jean-Jacques ULg et al

in Revue E Tijdschrift (1999), 115è année, 3/4

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See detailL'éclairage : une technique en évolution. Les méthodes de calcul et de simulation
Embrechts, Jean-Jacques ULg; Renglet, Michel; Eugène, Christian et al

in Revue E Tijdschrift (1999), 115è année, 3/4

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See detailMeasurements and modelization of light reflection on road pavement samples
Dijon, Jean-Marie; Embrechts, Jean-Jacques ULg; Brusten, Serge

in CIE Publication n°133 - Part 2 (1999)

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See detailProgress in the modelization of light reflection for lighting calculations
Embrechts, Jean-Jacques ULg

in Proceedings of the 24th Session of the C.I.E. , CIE Publication n°133-Part 1 (1999)

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See detailA safe method of truncating an echogram calculated by a sound ray technique
Embrechts, Jean-Jacques ULg

in Proceedings of the 16th International Congress on Acoustics (ICA) and 135th meeting of the Acoustical Soc. of America (ASA) - Volume 1 (1998)

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See detailModelization of Kirchhoff scattering by a sound ray algorithm
Embrechts, Jean-Jacques ULg

in Proceedings of the 16th International Congress on Acoustics (ICA) and 135th meeting of the Acoustical Soc. of America (ASA) - Volume 4 (1998)

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See detailAnalytical solution of a simple artificial lighting scheme to test any lighting software
Embrechts, Jean-Jacques ULg

in Light and Engineering (1998), 6(4)

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See detailAnalytical solution of a simple artificial lighting scheme to test any lighting software
Embrechts, Jean-Jacques ULg

in Computer Modeling & Simulation in Engineering (1998), 3(3)

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See detailNumerical processing of calculated echograms to derive stable room acoustics parameters
Embrechts, Jean-Jacques ULg

in Proceedings of the 104th Convention of the Audio Engineering Society, Convention paper nb. 4656 (1998)

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See detailSound diffusion by a layout of parallel suspended absorbing baffles
Embrechts, Jean-Jacques ULg

in Acustica united with Acta acustica (1996), 82 Suppl. 1

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