Influence of simple room geometries on acoustical parameters


  • John O'Keefe Aercoustics Engineering ltd, Toronto, Canada


Acoustic wave absorption, Acoustic wave reflection, Ceilings, Computer simulation, Floors, Reverberation, Theaters (legitimate), Early decay time (EDT), Reverberation time (RT)


A possible explanation for the difference between the early decay time (EDT) and the reverberation time (RT) in most rooms was suggested by Hodgson. The hypothesis considers: (1) a theatre or concert hall, in its simplest form, as a six-sided box with acoustical absorption on only one of the six sides (the floor); (2) the early reflected sound to be influenced by the sides of the box that are closest to each other; and (3) in a flat and wide room, the closest pair of sides is the ceiling and the floor with the floor being the only acoustically-absorbent surface in the box. To test this hypothesis, several experiments were performed using computer models of six-sided shoe box and fan-shaped rooms.




How to Cite

O’Keefe J. Influence of simple room geometries on acoustical parameters. Canadian Acoustics [Internet]. 1998 Sep. 1 [cited 2022 Oct. 5];26(3):25-6. Available from:



Proceedings of the Acoustics Week in Canada