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Measurement, Analysis, and Denoising of Directional Room Impulse Responses in Complex Spaces

Pierre Massé 1 Thibaut Carpentier 1 Olivier Warusfel 1 Markus Noisternig 1
1 EAC - Espaces acoustiques et cognitifs
STMS - Sciences et Technologies de la Musique et du Son
Abstract : The use of directional room impulse responses (DRIR) measured with spherical microphone arrays (SMA) has become widespread in the reproduction of spatial reverberation effects on surround-sound systems through multichannel convolution. However, the measurement of such DRIRs in "real-world" conditions is inevitably subject to several risk factors, including the presence of a nondecaying noise floor that can produce an "infinite reverberation" effect when convolved with an input sound. Recent work has focused on model-based techniques for removing this noise floor by replacing it with a re-synthesized prolongation of the measured reverberation tail, which has concurrently led to the development of a framework for the spatial analysis of reverberation properties. We present here a comprehensive evaluation of the proposed techniques through their application to DRIRs measured in particularly complex spaces, including spatially anisotropic late reverberation tails as well as multipleslope decays characteristic of coupled-volume configurations. Following a brief review of the theoretical underpinnings of the reverberation tail re-synthesis denoising procedure, the measurement, treatment, analysis, and subsequent denoising of these DRIRs are each detailed and assessed with quantitative metrics. Finally, a discussion of the anisotropic, direction-dependent analysis results obtained is included as the basis for a wider research question on the acoustical considerations behind a stochastic reverberation model allowing for spatial variations.
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Submitted on : Thursday, February 11, 2021 - 9:49:08 AM
Last modification on : Tuesday, July 13, 2021 - 2:17:13 PM
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Pierre Massé, Thibaut Carpentier, Olivier Warusfel, Markus Noisternig. Measurement, Analysis, and Denoising of Directional Room Impulse Responses in Complex Spaces. Forum Acusticum 2020, Dec 2020, Lyon, France. ⟨10.48465/fa.2020.0866⟩. ⟨hal-03138302⟩

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