Abstract
In an ongoing Nordic cooperation project the acoustical conditions in open-plan spaces are investigated. Of special interest is to find suitable acoustical parameters that reveal the acoustical conditions in these spaces and also are of importance for the subjective perceived acoustics. Measurements have so far been carried out in five open plan offices accompanied with an inquiry gathering the subjective judgments by the staff. A program for the acoustical measurements was designed specifying how to perform the measurements, which type of parameters to measure and how to report the results. The acoustical parameters included in the measurements are Reverberation time T20, Early Decay Time (EDT), Deutlichkeit (D50), Speech transmission index (STI), Speech intelligibility index (SII), Privacy Index (PI), Rate of spatial decay of sound pressure levels per distance doubling (DL2), Excess of sound pressure level with respect to a reference curve (DLf), background noise levels in occupied and unoccupied offices. The behavior of these parameters will be discussed and suitable parameters for evaluation of open plan spaces will be suggested.
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