Abstract
Suspended ceilings passing over a partition wall between adjacent rooms are a path of sound transmission from room to room for which, until recently, no analytical and satisfactory theory existed, although suspended ceilings are a common system of construction. The principal features of an analysis are outlined for the sound fields in the adjacent rooms, in the plates and absorber layers of the suspended ceiling and in the common plenum above the ceiling. The theory is based on a modal analysis. It not only shows the mechanisms of the sound transmission, which in contrast to common ideas, are quite different on the emission and on the receiving sides, but it also gives numerical results which agree (within the precision of measurements) with experimental data. The influence of geometrical parameters (e.g., plenum height, room width) and of material parameters (e.g., absorber layer thickness) can be demonstrated quantitatively.
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