Improved Reverberation Time Control for Feedback Delay Networks

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Researchers

Research units

  • International Audio Laboratories Erlangen

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.

Details

Original languageEnglish
Title of host publicationProceedings of the International Conference on Digital Audio Effects
Publication statusPublished - 2 Sep 2019
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Digital Audio Effects - Birmingham, United Kingdom
Duration: 2 Sep 20196 Sep 2019
Conference number: 22

Publication series

NameProceedings of the International Conference on Digital Audio Effects
ISSN (Print)2414-6382
ISSN (Electronic)2413-6689

Conference

ConferenceInternational Conference on Digital Audio Effects
Abbreviated titleDAFX
CountryUnited Kingdom
CityBirmingham
Period02/09/201906/09/2019

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