Improved reverberation time control for feedback delay networks
Prawda K, Välimäki V, Schlecht S (2019)
Publication Type: Conference contribution
Publication year: 2019
Pages Range: 299-306
Conference Proceedings Title: Proceedings of the International Conference on Digital Audio Effects, DAFx
Event location: Birmingham, GBR
Abstract
Artificial reverberation algorithms generally imitate the frequency-dependent decay of sound in a room quite inaccurately. Previous research suggests that a 5% error in the reverberation time (T60) can be audible. In this work, we propose to use an accurate graphic equalizer as the attenuation filter in a Feedback Delay Network reverberator. We use a modified octave graphic equalizer with a cascade structure and insert a high-shelf filter to control the gain at the high end of the audio range. One such equalizer is placed at the end of each delay line of the Feedback Delay Network. The gains of the equalizer are optimized using a new weighting function that acknowledges nonlinear error propagation from filter magnitude response to reverberation time values. Our experiments show that in real-world cases, the target T60 curve can be reproduced in a perceptually accurate manner at standard octave center frequencies. However, for an extreme test case in which the T60 varies dramatically between neighboring octave bands, the error still exceeds the limit of the just noticeable difference but is smaller than that obtained with previous methods. This work leads to more realistic artificial reverberation.
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Finland (FI)How to cite
APA:
Prawda, K., Välimäki, V., & Schlecht, S. (2019). Improved reverberation time control for feedback delay networks. In Proceedings of the International Conference on Digital Audio Effects, DAFx (pp. 299-306). Birmingham, GBR.
MLA:
Prawda, Karolina, Vesa Välimäki, and Sebastian Schlecht. "Improved reverberation time control for feedback delay networks." Proceedings of the 22nd International Conference on Digital Audio Effects, DAFx 2019, Birmingham, GBR 2019. 299-306.
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