title: Different sound decay patterns and energy feedback in coupled volumes.
abstract: Different non-exponential decays such as the concave and the convex double sloped decays in the coupled rooms provide distinct sound qualities. These are commonly considered to occur in the less reverberant sub-room and the more reverberant sub-room, respectively. However, numerical simulations and experiments in this paper show that the demarcation line is not located along the physical boundaries (e.g., the partition and the coupling aperture), but in the more reverberant sub-room. The sound field with the concave double sloped decay penetrates into the auxiliary sub-room to an extent which is influenced by the difference between the two natural reverberations of the sub-rooms. Furthermore the sound energy flows in different regions are investigated, demonstrating how energy feedback leads to the concave double sloped decay.
authors.affiliation: Key Laboratory of Modern Acoustic, Institute of Acoustics, Nanjing University, Nanjing 210093, China. puhongjie@nju.edu.cn
authors.forename: Hongjie
authors.initials: H
authors.lastname: Pu
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Qiu
authors.forename: Jiqing
authors.initials: J
authors.lastname: Wang
mesh_terms: D000042:Absorption; D000162:Acoustics; D001108:Architecture / Q000379:methods*; D001307:Auditory Perception; D004779:Environment Design; D005246:Feedback; D006801:Humans; D008962:Models, Theoretical; D013016:Sound