The evaluation of speech intelligibility for acoustical variables in the open plan office

Abstract

There are several acoustical variables to be considered when designing an open plan office. These variables are identified and measured with mock-ups in a semi-anechoic test chamber. Articulation index is used as an analysis technique to evaluate each variable's impact on speech intelligibility. The affect of the panel, ceiling, and vertical wall sound absorption is evaluated. The speech level, speaker directivity, panel height, and ambient noise level are also considered. The laboratory measurements and the utilization of articulation index provide a meaningful method to evaluate and compare acoustical variables in the open plan office.