Multichannel Interleaved Velvet Noise

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openAccess
Journal Title
Journal ISSN
Volume Title
Conference article in proceedings
Date
2022-09-08
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Mcode
Degree programme
Language
en
Pages
8
208-215
Series
Proceedings of the 25th International Conference on Digital Audio Effects (DAFx20in22)
Abstract
The cross-correlation of multichannel reverberation generated using interleaved velvet noise is studied. The interleaved velvet-noise reverberator was proposed recently for synthesizing the late reverb of an acoustic space. In addition to providing a computationally efficient structure and a perceptually smooth response, the interleaving method allows combining its independent branch outputs in different permutations, which are all equally smooth and flutter-free. For instance, a four-branch output can be combined in 4! or 24 ways. Additionally, each branch output set is mixed orthogonally, which increases the number of permutations from M! to M^2!, since sign inversions are taken along. Using specific matrices for this operation, which change the sign of velvet-noise sequences, decreases the correlation of some of the combinations. This paper shows that many selections of permutations offer a set of well decorrelated output channels, which produce a diffuse and colorless sound field, which is validated with spatial variation. The results of this work can be applied in the design of computationally efficient multichannel reverberators.
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Keywords
audio signal processing, reverb algorithm, artificial reverberation, multichannel audio, correlation analysis
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Citation
Prawda , K , Schlecht , S & Välimäki , V 2022 , Multichannel Interleaved Velvet Noise . in G Evangelista & N Holighaus (eds) , Proceedings of the 25th International Conference on Digital Audio Effects (DAFx20in22) . DAFx , Vienna, Austria , pp. 208-215 , International Conference on Digital Audio Effects , Vienna , Austria , 07/09/2022 . < https://dafx2020.mdw.ac.at/proceedings/DAFx20in22Proceedings.pdf >