Common-slope modeling of late reverberation in coupled rooms

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Journal ISSN
Volume Title
Conference article in proceedings
Date
2022
Major/Subject
Mcode
Degree programme
Language
en
Pages
12
1-12
Series
Proceedings of the 24th International Congress on Acoustics: A12: Room Acoustics, Proceedings of the ICA congress
Abstract
Coupled rooms have a distinct sound energy decay behavior, which exhibits more than one decay time under certain conditions. The sound energy decay analysis in such scenarios requires decay models consisting of multiple exponentials with distinct decay rates and amplitudes. While multi-exponential decay analysis is commonly used in room acoustics, the spatial and directional sound energy decay variations in coupled rooms have received little attention. In this work, we introduce the common-slope model of late reverberation for coupled rooms. Common slopes are spatially and directionally invariant decay functions over time, whose amplitudes model all decay variations with respect to the source-receiver configuration. For example, in a scene consisting of two coupled rooms, it is possible to determine two common decay times that approximate the decay for all source-receiver configurations in the scene. Consequently, all spatial and directional decay variations are expressed via decay amplitudes only. We apply the common-slope analysis to measurements of room transitions between coupled rooms. Our analysis shows that the common-slope model approximates the measured sound energy decay with little error. The proposed common-slope model can be used for room acoustic analysis and the efficient synthesis of artificial late reverberation tails.
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Keywords
sound energy decay, coupled rooms, EDC, EDF, reverberation time, decay time, multi-exponential sound energy decay
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Citation
Götz , G , Schlecht , S J & Pulkki , V 2022 , Common-slope modeling of late reverberation in coupled rooms . in Proceedings of the 24th International Congress on Acoustics: A12: Room Acoustics . Proceedings of the ICA congress , Acoustical Society of Korea (ASK) , pp. 1-12 , International Congress on Acoustics , Gyeongju , Korea, Republic of , 24/10/2022 . < https://ica2022korea.org/data/Proceedings_A12.pdf >