Velvet-noise decorrelator
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A4 Artikkeli konferenssijulkaisussa
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Date
2017
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en
Pages
7
405-411
405-411
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Proceedings of the 20th International Conference on Digital Audio Effects, Proceedings of the International Conference on Digital Audio Effects
Abstract
Decorrelation of audio signals is an important process in the spatial reproduction of sounds. For instance, a mono signal that is spread on multiple loudspeakers should be decorrelated for each channel to avoid undesirable comb-filtering artifacts. The process of decorrelating the signal itself is a compromise aiming to reduce the correlation as much as possible while minimizing both the sound coloration and the computing cost. A popular decorrelation method, convolving a sound signal with a short sequence of exponentially decaying white noise which, however, requires the use of the FFT for fast convolution and may cause some latency. Here we propose a decorrelator based on a sparse random sequence called velvet noise, which achieves comparable results without latency and at a smaller computing cost. A segmented temporal decay envelope can also be implemented for further optimizations. Using the proposed method, we found that a decorrelation filter, of similar perceptual attributes to white noise, could be implemented using 87% less operations. Informal listening tests suggest that the resulting decorrelation filter performs comparably to an equivalent white-noise filter.Description
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Citation
Alary, B, Politis, A & Välimäki, V 2017, Velvet-noise decorrelator . in Proceedings of the 20th International Conference on Digital Audio Effects . Proceedings of the International Conference on Digital Audio Effects, University of Edinburgh, pp. 405-411, International Conference on Digital Audio Effects, Edinburgh, United Kingdom, 05/09/2017 . < http://www.dafx17.eca.ed.ac.uk/papers/DAFx17_paper_96.pdf >