Resumen de Sound decay and steady-state level in rooms with ceiling treatment
Nilsson Erling, Andersson Nils-Ake
The aim of this paper is to describe the behaviour of sound field in rooms with absorbent ceiling treatment in respect to steady-state sound pressure levels (SPL) and sound decays. It is shown that the reverberation time and steady-state SPL�s are determined by different parts of the sound field and that they are weakly related to each other. As an example, two rooms with equal reverberation times can have significantly different influence on the steady-state SPL�s. This is in contradiction to the diffuse field theory. Measurement results from eight classrooms with different ceiling treatments are presented. Formulas for estimating the reverberation time and the decrease in SPL in rooms with ceiling treatment will be presented as well.
