Prediction of spatial decay of speech in open-plan offices conforming ISO 3382-3 principles

Invited paper

Valtteri Hongisto

Institute of Occupational Health

Tuesday 2 june, 2015, 15:40 - 16:00

0.9 Athens (118)

The aim of this study is to present a model that can be used to predict the spatial attenuation of speech using terms of ISO 3382-3. The regression model is based on the measurement data of 16 different open-plan offices (Virjonen et al. 2009). It takes into account the above-mentioned room acoustic variables. The predicted results are spatial attenuation curves of the A-weighted sound pressure level of speech and the speech transmission index, STI. The curves are used to determine the single-number quantities: the spatial decay rate of the A- weighted sound pressure level of speech, D2,S, the A-weighted sound pressure level of speech at 4 m from the speaker, LA,S,4m, and the distraction distance, rD. The prediction accuracy of the single-number quantities was determined in ten new offices. The prediction errors of D2,S, LA,S,4m and rD were less than 1.5 dB, 3.0 dB, and 2.5 m in most cases, respectively. This accuracy is sufficient for most practical purposes. The model was programmed into a prediction tool, which is freely available on the internet. NOTE; This paper is invited and belongs to the session organized By Sara Vellenga-Persoon (Session name: Room Acoustics/Open plan offices.

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