Projects per year
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.
|Title of host publication||Proceedings of the International Conference on Digital Audio Effects|
|Publisher||University of Birmingham|
|Number of pages||8|
|Publication status||Published - 2 Sep 2019|
|MoE publication type||A4 Article in a conference publication|
|Event||International Conference on Digital Audio Effects - Birmingham, United Kingdom|
Duration: 2 Sep 2019 → 6 Sep 2019
Conference number: 22
|Name||Proceedings of the International Conference on Digital Audio Effects|
|Conference||International Conference on Digital Audio Effects|
|Period||02/09/2019 → 06/09/2019|
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 (Proceedings of the International Conference on Digital Audio Effects). University of Birmingham.