Scattering in Feedback Delay Networks

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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2020-06-10

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Department of Signal Processing and Acoustics
Department of Media

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en

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10

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IEEE/ACM Transactions on Audio Speech and Language Processing, Volume 28, pp. 1915-1924

Abstract

Feedback delay networks (FDNs) are recursive filters, which are widely used for artificial reverberation and decorrelation. One central challenge in the design of FDNs is the generation of sufficient echo density in the impulse response without compromising the computational efficiency. In a previous contribution, we have demonstrated that the echo density of an FDN can be increased by introducing so-called delay feedback matrices where each matrix entry is a scalar gain and a delay. In this contribution, we generalize the feedback matrix to arbitrary lossless filter feedback matrices (FFMs). As a special case, we propose the velvet feedback matrix, which can create dense impulse responses at a minimal computational cost. Further, FFMs can be used to emulate the scattering effects of non-specular reflections. We demonstrate the effectiveness of FFMs in terms of echo density and modal distribution.

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Keywords

artificial reverberation, echo density, Feedback delay network, paraunitary matrices, scattering

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DOI

10.1109/TASLP.2020.3001395

Citation

Schlecht, S J & Habets, E A P 2020, ' Scattering in Feedback Delay Networks ', IEEE/ACM Transactions on Audio Speech and Language Processing, vol. 28, 9113451, pp. 1915-1924 . https://doi.org/10.1109/TASLP.2020.3001395

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https://urn.fi/URN:NBN:fi:aalto-202008064496

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[article-cris] Sähkötekniikan korkeakoulu / ELEC