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Contrôle des impressions spatiales dans un environnement acoustique virtuel

François Salmon 1, 2, 3
1 Lab-STICC_PS - Equipe Sound Perception
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance : UMR6285
Abstract : The work presented in this thesis contributes to the development of new tools that facilitate the design of immersive sound spaces for the production of Virtual Reality contents. More specifically, we aimed to allow the control of spatial impressions : the apparent source width and the sensation of envelopment. To this end, several studies have been conducted to evaluate the perception of room acoustics using a non-individualized binaural rendering of ambisonic sound scenes, which is common in this context. Since immersive contents usually consist of a 360° visual environment and a wide variety of sound sources, the first part of this thesis focuses on the influence of these two components on the perception of room acoustics. The second part addresses the parameterization of Spatial Room Impulse Responses (SRIRs), which are transfer functions that describe the acoustic path between the sound source and the listener. The spatial, temporal and frequency resolutions of SRIRs were studied to seek a possible reduction in the amount of data and thus a better apprehension of the perceptual control, while maintaining spatial and timbral fidelity. The last part focuses on the modification of SRIRs for the control of spatial impressions. In order to evaluate the control of the apparent source width, several spatial transformations were applied to the first-order ambisonic signals used to describe the early reflections of SRIRs. For the control of the sensation of envelopment, a method was proposed using an artificial reverberator that allows the modification of the sound energy amplitudes and decay slopes in several frequency bands and angular sectors.
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https://tel.archives-ouvertes.fr/tel-03210617
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Submitted on : Wednesday, April 28, 2021 - 9:11:03 AM
Last modification on : Sunday, May 9, 2021 - 3:28:56 AM

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  • HAL Id : tel-03210617, version 1

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François Salmon. Contrôle des impressions spatiales dans un environnement acoustique virtuel. Acoustique [physics.class-ph]. Université de Bretagne Occidentale (UBO), 2021. Français. ⟨tel-03210617⟩

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