Active Acoustics With a Phase Cancelling Modal Reverberator
de Bortoli GM, Prawda K, Schlecht SJ (2024)
Publication Type: Journal article
Publication year: 2024
Journal
Book Volume: 72
Pages Range: 705-715
Journal Issue: 10
Abstract
Active acoustics (AA) systems are used to electronically modify the acoustics of a room (e.g., in live music venues). AA systems have an inherent feedback component and can suffer from instability and coloration artifacts resulting from too high feedback gains. State-ofthe-art methods can improve system stability and coloration, usually at the cost of complex implementations and long parameter-tuning sessions. They can also cause sound artifacts due to time-varying components, limiting the enhancement at low frequencies. This work proposes a time-invariant feedback attenuation method for low frequencies based on a modal reverberator. The attenuation is achieved through destructive acoustic interference, obtained via phase shifts between the input and output signals. The analyzed frequency range is 0-500 Hz, where the room transfer functions are considered highly invariant over time. The results show a gain-before-instability increase of more than 5 dB for a modal reverberator with high mode density in this frequency range. The improvement is also stable for low-magnitude changes in the room transfer functions over time. The proposed method provides a robust AA system with artificial reverberation for the low-frequency range and can be used alongside other established methods.
Authors with CRIS profile
Involved external institutions
Finland (FI)How to cite
APA:
de Bortoli, G.M., Prawda, K., & Schlecht, S.J. (2024). Active Acoustics With a Phase Cancelling Modal Reverberator. Journal of the Audio Engineering Society, 72(10), 705-715. https://doi.org/10.17743/jaes.2022.0171
MLA:
de Bortoli, Gian Marco, Karolina Prawda, and Sebastian J. Schlecht. "Active Acoustics With a Phase Cancelling Modal Reverberator." Journal of the Audio Engineering Society 72.10 (2024): 705-715.
BibTeX: Download