References of "Embrechts, Jean-Jacques"
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See detailEvaluation du temps de mélange à partir de la distribution temporelle du libre parcours dans une salle
Billon, Alexis ULg; Dirix, Simon; Embrechts, Jean-Jacques ULg

in Actes du 10ème Congrès Français d'Acoustique (2010, April)

Dans un espace clos où se mélangent les nombreuses ondes réfléchies, diffusées et diffractées par les surfaces, la propagation de l’énergie sonore peut être décomposée en deux étapes: tout d’abord, un ... [more ▼]

Dans un espace clos où se mélangent les nombreuses ondes réfléchies, diffusées et diffractées par les surfaces, la propagation de l’énergie sonore peut être décomposée en deux étapes: tout d’abord, un processus déterministe pour lequel il est possible d’identifier individuellement chaque contribution, suivi d’un processus stochastique pour lequel les contributions doivent être globalisées et vues comme un processus quasi-aléatoire. Le seuil de transition entre les deux comportements est matérialisé dans l’échogramme par le temps de mélange. Dans cette étude, le temps de mélange est analysé en regard de la distribution temporelle du libre parcours. Celle-ci est obtenue numériquement à l’aide du programme de tir de rayons large bande Salrev. Dans un premier temps, le mélange est identifié au travers du caractère asymptotique de cette distribution. Le temps de mélange est alors défini comme la durée (mesurée à partir de l’instant d’émission au départ de la source) nécessaire pour atteindre ce comportement asymptotique. A partir de cette définition du temps de mélange sont étudiées les influences de divers paramètres géométriques et acoustiques. Ensuite, trois applications pour des salles de concert sont réalisées. Cette étude montre que les valeurs obtenues pour le temps de mélange convergent vers celles observées expérimentalement, à condition que les parois de la salle soient suffisamment diffusantes. [less ▲]

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See detailIntroduction to colorimetry
Embrechts, Jean-Jacques ULg

Learning material (2010)

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See detailAdding sound to movies: Historical trends and new challenges of 3D cinema
André, Cédric ULg; Embrechts, Jean-Jacques ULg; Verly, Jacques ULg

Conference (2009, December 03)

Very little research has been done so far in producing 3D sound and audio that are consistent with the 3D stereo video being viewed by the spectator. After a review of the currently used techniques for ... [more ▼]

Very little research has been done so far in producing 3D sound and audio that are consistent with the 3D stereo video being viewed by the spectator. After a review of the currently used techniques for theater sound reproduction, this talk presents new challenges of 3D cinema in terms of sound reproduction and analyse which known 3D audio techniques are able to tackle those challenges. [less ▲]

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See detailAn interactive and real-time 3D auralization system for room acoustics (the AURALIAS project)
Bos, Lionel ULg; Embrechts, Jean-Jacques ULg

in Proceedings of the 3D Stereo Media congress, Liege 2010 (2009, December)

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See detailObjective study of spatial attributes in the room impulse response's late part and their relevance for auralization
Billon, Alexis ULg; Embrechts, Jean-Jacques ULg

in Proceedings of the Euronoise 2009 Congress (2009, October)

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See detailSize-adaptive spherical receptor acceleration method for acoustical ray tracing
Lesoinne, Stéphane ULg; Embrechts, Jean-Jacques ULg

in Proceedings of the 5th Forum Acusticum "Acoustics '08" (2008, July)

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See detailMathematical modelization of reduced luminance coefficients for dry road surfaces
Debergh, Nathalie; Embrechts, Jean-Jacques ULg

in Lighting Research & Technology (2008), 40

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See detailAcoustique du bâtiment
Embrechts, Jean-Jacques ULg

Learning material (2008)

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See detailAcoustique appliquée: fondements et lutte contre le bruit
Embrechts, Jean-Jacques ULg

Learning material (2008)

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See detailA moving listener in a virtual audio environment with particularly irregular reverberation decay
Embrechts, Jean-Jacques ULg; Lesoinne, Stéphane ULg; Werner, Nicolas

in Proceedings of the 28th Symposium on Information Theory in the Benelux (2007)

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See detailA video-based human-computer interaction system for audio-visual immersion
Dardenne, Renaud; Embrechts, Jean-Jacques ULg; Van Droogenbroeck, Marc ULg et al

in Proceedings of SPS-DARTS (2006, March)

This paper describes the video and audio tools that have been implemented in a real-type system to immerse a user into a virtual scene. The video tools include motion detection, skin detection by ... [more ▼]

This paper describes the video and audio tools that have been implemented in a real-type system to immerse a user into a virtual scene. The video tools include motion detection, skin detection by thresholding, shadow detection and extraction, and finally the user’s head and hands detection. Once this is done, the user (who is surrounded by a matrix of loudspeakers) is able to move a sound source in the horizontal plane around him. Moreover, the sound is auralized by convolution with (directional) room impulse responses, which have been pre-computed by a ray tracing method. The different sound contributions are distributed to the individual loudspeakers by applying the VBAP technique. [less ▲]

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See detailResearch Unit in Signal and Image Exploitation (INTELSIG)
Verly, Jacques ULg; Piater, Justus ULg; Van Droogenbroeck, Marc ULg et al

Scientific conference (2006)

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See detailA tutorial on scattering and diffusion coefficients for room acoustic surfaces
Cox, T. J.; Dalenback, B.-I.; D'Antonio, P. et al

in Acta Acustica United with Acustica (2006), 92(1, JAN-FEB), 1-15

There is a need to be able to quantify how sound is reflected from a surface, in terms of how it is spatially dispersed. In recent years, diffusion and scattering coefficients have been developed to ... [more ▼]

There is a need to be able to quantify how sound is reflected from a surface, in terms of how it is spatially dispersed. In recent years, diffusion and scattering coefficients have been developed to enable room acoustic prediction models to be more accurate, and designers to evaluate the worth of diffusing surfaces. Two coefficients have been, or are about to be, enshrined in standards. With two coefficients being standardised, there is great potential for confusion. This paper is intended to bring together authors from different areas to explain where the coefficients should and should not be applied. In addition, this tutorial paper will revisit the rationale behind the coefficients and contrast the coefficient definitions and performance. [less ▲]

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