Projects per year
Artificial reverberation is an audio effect used to simulate the acoustics of a space while controlling its aesthetics, particularly on sounds recorded in a dry studio environment. Delay-based methods are a family of artificial reverberators using recirculating delay lines to create this effect. The feedback delay network is a popular delay-based reverberator providing a comprehensive framework for parametric reverberation by formalizing the recirculation of a set of interconnected delay lines. However, one known limitation of this algorithm is the initial slow build-up of echoes, which can sound unrealistic, and overcoming this problem often requires adding more delay lines to the network. In this paper, we study the effect of adding velvet-noise filters, which have random sparse coefficients, at the input and output branches of the reverberator. The goal is to increase the echo density while minimizing the spectral coloration. We compare different variations of velvet-noise filtering and show their benefits. We demonstrate that with velvet noise, the echo density of a conventional feedback delay network can be exceeded using half the number of delay lines and saving over 50% of computing operations in a practical configuration using low-order attenuation filters.
|Title of host publication||Proceedings of the International Conference on Digital Audio Effects|
|Number of pages||8|
|Publication status||Published - 9 Sep 2020|
|MoE publication type||A4 Article in a conference publication|
|Event||International Conference on Digital Audio Effects - Virtual (Initially Vienna), Vienna, Austria|
Duration: 9 Sep 2020 → 11 Sep 2020
Conference number: 23
|Name||Proceedings of the International Conference on Digital Audio Effects|
|Conference||International Conference on Digital Audio Effects|
|Period||09/09/2020 → 11/09/2020|
- Audio Effects
- Digital signal processing
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NordicSMC: Nordic Sound and Music Computing Network
Välimäki, V., Louise, B., Mikkonen, O., Prawda, K., Roberts, J. & Fagerström, J.
01/01/2018 → 31/12/2023
Project: Other external funding: Other foreign funding
ICHO: Immersive Concert for Homes
Alary, B. & Välimäki, V.
01/09/2016 → 01/09/2020
Project: Academy of Finland: Other research funding
Aalto Acoustics Lab
Ville Pulkki (Manager)School of Electrical Engineering