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See detail3D real-time auralization with separate rendering of direct sound, reflections and directional late reverberation
Lesoinne, Stéphane ULg; Werner, Nicolas; Embrechts, Jean-Jacques ULg

in Proceedings of the 2006 international Conference on Auditory Display (2006)

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See detailIntroduction aux techniques audio et vidéo
Embrechts, Jean-Jacques ULg

Learning material (2006)

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See detailCalculation of the random-incidence scattering coefficients of a sine-shaped surface
Embrechts, Jean-Jacques ULg; De Geetere, L.; Vermeir, G. et al

in Acta Acustica United with Acustica (2006), 92(4, JUL-AUG), 593-603

Random-incidence scattering coefficients obtained by measurement in reverberation chambers (ISO 17497-1) for a particular sine-shaped surface are compared with theoretical results. Holford-Urusovskii's ... [more ▼]

Random-incidence scattering coefficients obtained by measurement in reverberation chambers (ISO 17497-1) for a particular sine-shaped surface are compared with theoretical results. Holford-Urusovskii's method and a hybrid plane wave decomposition - FEM method are applied to an infinite sine-shaped surface having the same profile, while the 3D BEM gives numerical results for the finite-size surface. Perfect rigidity (Neumann boundary condition) is assumed in all computations. The validity of the computations is compared and discussed with regard to the approximations involved. Finally, the measured and calculated values of the scattering coefficients are compared. A good correspondence is found, in particular concerning the overall dependence on frequency. Small deviations have however been observed, at low as well as at high frequencies. They will be explained by uncertainties in the measurements and discretisation errors in the calculations. [less ▲]

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See detailThe CINEMA Project: A Video-Based Human-Computer Interaction System for Audio-Visual Immersion
Dardenne, Renaud; Embrechts, Jean-Jacques ULg; Van Droogenbroeck, Marc ULg et al

in ERCIM News (2005), 62

Numerous studies are currently focusing on the modelling of humans and their behavior in 3D environments. The CINEMA project has similar goals but differentiates itself by aiming at enhanced interactions ... [more ▼]

Numerous studies are currently focusing on the modelling of humans and their behavior in 3D environments. The CINEMA project has similar goals but differentiates itself by aiming at enhanced interactions, the creation of mixed reality, and the creation of interactive and reactive acoustical environments. Part of the project consists in gesture recognition of a user, who is given the real-time control of auralization and audio spatialization processes. [less ▲]

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See detailAuralization in Room Acoustics using Directional Impulse Responses Computed by Sound Ray Techniques
Embrechts, Jean-Jacques ULg; Werner, Nicolas; Lesoinne, Stéphane ULg

in Proceedings of the 4th Forum Acusticum Congress (2005)

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See detailComputation of Directional Impulse Responses in Rooms for Better Auralization
Embrechts, Jean-Jacques ULg; Werner, Nicolas; Lesoinne, Stéphane ULg

in Proceedings of the 118th Convention of the Audio Engineering Society (2005)

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See detailActive noise control in frontages of buildings
Tamaz, Patrick; Caule, Patrice; Nemerlin, Jean ULg et al

in Proceedings of SPS-DARTS 2005 (2005)

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See detailRandom-incidence scattering coefficients of infinite sine-shaped surfaces
Embrechts, Jean-Jacques ULg

in Proceedings of the 4th Forum Acusticum Congress (2005)

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See detailPlacement of Piezoelectric Laminate Actuator for Active Structural Acoustic Control
Brasseur, Maud; De Boe, Pascal; Golinval, Jean-Claude ULg et al

Conference (2004)

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See detailActive noise insulation in frontages of buildings
Caule, Patrice; Tamaz, Patrick; Brasseur, Maud et al

Conference (2004)

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See detailCase studies in measurement of random incidence scattering coefficients
Vorländer, Michael; Embrechts, Jean-Jacques ULg; De Geetere, Lieven et al

in Acta Acustica United With Acustica (2004), 90(5, SEP-OCT), 858-867

In this work measurements of random-incidence scattering coefficients in three laboratories are compared. The sample geometry is sinusoidal. These surfaces are geometrically identical, but they were ... [more ▼]

In this work measurements of random-incidence scattering coefficients in three laboratories are compared. The sample geometry is sinusoidal. These surfaces are geometrically identical, but they were constructed in different scales. So far, measurements of this kind were performed only in scale models. Using turntables in real sample size was hardly considered possible. One result of general importance is that measurements are indeed possible in real-scale reverberation rooms with turntables of 3 m diameter. There are only small differences between the real-scale and model-scale results. Some variations of the standard procedure were tested and the uncertainties identified: mounting of the sample, connection or sealing between sample and base plate, way of rotating the sample, air absorption and time variances. The results presented can be regarded as guidelines for application of ISO/DIS 17497-1. [less ▲]

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See detailNotions d'acoustique
Embrechts, Jean-Jacques ULg

Conference (2003, November)

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See detailOptimal design of outdoor lighting systems by genetic algorithms - Discussion
Embrechts, Jean-Jacques ULg

in Lighting Research & Technology (2003), 35(3), 278-280

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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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