A study of the spatial non-uniformity of reverberation time at low frequencies
Prinn AG, Tuna Ç, Walther A, Habets E (2025)
Publication Type: Journal article
Publication year: 2025
Journal
Book Volume: 227
Article Number: 110220
DOI: 10.1016/j.apacoust.2024.110220
Abstract
This paper presents a study of the spatial non-uniformity of low-frequency reverberation time estimates. Using measured and simulated data, it is demonstrated that the reverberation times estimated from band-limited impulse responses vary as a function of space at low frequencies. The origin of this spatial dependency is investigated using a one-dimensional finite element model. It is shown that the Q-factor and reverberation time at the resonant frequency of a particular mode are spatially dependent and that the spatial dependency is related to the mode shapes. The ranges of the reverberation time estimates as a function of third-octave frequency bands in simulated and measured rooms are presented. An additional finding is that modal damping constants (obtained via eigenvalue analysis) quantify the decay of uncoupled modes but not necessarily the reverberation time. These observations have implications for measurements and simulations of reverberation time at low frequencies. When measuring a spatially averaged reverberation time, the choice of source and receiver positions is important. A guideline is proposed that defines a set of preferred measurement positions based on the mode shapes, from which estimates of the spatially averaged reverberation time can be obtained.
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Germany (DE)How to cite
APA:
Prinn, A.G., Tuna, Ç., Walther, A., & Habets, E. (2025). A study of the spatial non-uniformity of reverberation time at low frequencies. Applied Acoustics, 227. https://doi.org/10.1016/j.apacoust.2024.110220
MLA:
Prinn, Albert G., et al. "A study of the spatial non-uniformity of reverberation time at low frequencies." Applied Acoustics 227 (2025).
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