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Article Dans Une Revue Journal of the Acoustical Society of America Année : 2020

A Robust Denoising Process for Spatial Room Impulse Responses with Diffuse Reverberation Tails

Pierre Massé
Thibaut Carpentier
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Olivier Warusfel
Markus Noisternig

Résumé

Spatial room impulse responses (SRIRs) measured using spherical microphone arrays are seeing increasingly widespread use in reproducing room reverberation effects on three-dimensional surround sound systems (e.g., higher-order ambisonics) through multi-channel SRIR convolution. However, such measured impulse responses inevitably present a non-negligible noise floor, which may lead to a perceptible "infinite reverberation effect" when convolved with an input sound. Furthermore, individual sensor noise and momentary measurement artefacts may additionally corrupt the resulting impulse response. This paper presents a robust SRIR denoising procedure applicable to impulse responses with diffuse late reverberation tails, which can be modeled by a stochastic process. In such cases, the non-decaying frequency-dependent noise floor may be replaced by a synthesized incoherent tail parame-terized by the SRIR's energy decay envelope. It is shown that performing such tail re-synthesis in the spherical harmonic domain, using an independent zero-mean Gaussian noise for each component, preserves both the reverberation tail's frequency-dependent decay as well as its spatial coherence properties. The proposed process is then evaluated through its application to SRIRs measured in real-world conditions, and finally some aspects of performance and consistency verification are discussed.
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Dates et versions

hal-02443679 , version 1 (17-01-2020)
hal-02443679 , version 2 (20-04-2020)

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Citer

Pierre Massé, Thibaut Carpentier, Olivier Warusfel, Markus Noisternig. A Robust Denoising Process for Spatial Room Impulse Responses with Diffuse Reverberation Tails. Journal of the Acoustical Society of America, 2020, 147 (4), pp.2250-2260. ⟨10.1121/10.0001070⟩. ⟨hal-02443679v2⟩
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