Using acoustical modeling software to predict speech privacy in open-plan offices

Speech Privacy Index is one of the commonly used metrics to discuss an occupant’s acoustical comfort in an open-plan office. In existing open-plan offices, the Articulation Index can be measured using a qualified sound source; the Privacy Index can then be calculated from the Articulation Index. However, in the case of future office planning, the Privacy Index must be estimated. Using the ODEON acoustical modeling software, we estimated the Privacy Index in the open-plan section of our office using the existing room dimensions, material finishes, and background noise levels. The ODEON estimates were then compared with “real world” measurements of the same space. This paper summarizes the differences between the estimated and measured speech privacy index levels.