Abstract
The increase of the average of the potential sound energy density close to enclosure's boundaries (and the corresponding sound level) is theoretically studied, showing that in the corners this value is greater than the 9 dB commonly accepted one. This is due to the presence of interference terms. The study was made on the basis of the eigenmode model applied to a room with hard walls, which allows for stationary waves, in which we suppose a sound diffuse field, and a range of frequencies as large as to excite the normal frequencies of the room and consider them as independent. Finally, the work shows explicitly the expressions for the oblique, the tangential, and the axial modes.
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