References of "Embrechts, Jean-Jacques"
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See detailCalculation of the scattering coefficient of a sine-shaped surface by using the BEM method
De Geetere, L.; Embrechts, Jean-Jacques ULg; Vermeir, G.

in Proceedings of the Institute of Acoustics (2003), 25(5), 75-83

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See detailCalculation of the scattering coefficient of a sine-shaped surface by solving the Helmholtz integral
Embrechts, Jean-Jacques ULg; De Geetere, L.; Vermeir, G.

in Proceedings of the Institute of Acoustics (2003), 25(5), 67-74

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See detailIntroduction aux techniques de l'éclairage
Embrechts, Jean-Jacques ULg

Conference (2002, June)

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See detailComparison of different impulse response measurement techniques
Stan, Guy-Bart; Embrechts, Jean-Jacques ULg; Archambeau, Dominique

in Journal of the Audio Engineering Society (2002), 50(4), 249-262

The impulse response of an acoustical space or transducer is one of its most important characterizations. In order to perform the measurement of their impulse responses, four of the most suitable methods ... [more ▼]

The impulse response of an acoustical space or transducer is one of its most important characterizations. In order to perform the measurement of their impulse responses, four of the most suitable methods are compared: MLS (maximum-length sequence), IRS (inverse repeated sequence), time-stretched pulses, and SineSweep. These methods have already been described in the literature. Nevertheless, the choice of one of them depending on the measurement conditions is critical. Therefore an extensive comparison has been realized. This comparison was done through the implementation and realization of a complete, fast, reliable, and cheap measurement system. Finally, a conclusion for the use of each method according to the principal measurement conditions is presented. It is shown that in the presence of nonwhite noise, the MLS and IRS techniques seem to be more accurate. On the contrary, in quiet environments the logarithmic SineSweep method seems to be the most appropriate. [less ▲]

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See detailActive insulation in dwellings
Embrechts, Jean-Jacques ULg; Caule, Patrice; Tamaz, Patrick et al

in NAG journaal (2002), 162

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See detailModélisation des réflexions diffuses en acoustique des salles: état de la question
Embrechts, Jean-Jacques ULg

in Actes du 6è Congrès Français d'Acoustique (2002)

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See detailStudy of the influence of coloured road surfaces on the efficiency of road lighting installations
Frankinet, Marc; Gillet, Marc; Duthoit, Fabienne ULg et al

in Proceedings of the 9th Lux Europa Congress (2001)

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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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