Multichannel Interleaved Velvet Noise
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Journal Title
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Volume Title
A4 Artikkeli konferenssijulkaisussa
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Date
2022-09-08
Major/Subject
Mcode
Degree programme
Language
en
Pages
8
208-215
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.Description
Keywords
audio signal processing, reverb algorithm, artificial reverberation, multichannel audio, correlation analysis
Other note
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 >
