Paper Conference

Proceedings of BSA Conference 2022: Fifth Conference of IBPSA-Italy


Intelligibility Prediction in Scholar Classrooms

Samantha Di Loreto, Fabio Serpilli, Valter Lori, Costanzo Di Perna

Abstract: In recent Italian Law, the DM 11/01/2017 about Environmental criteria, reference values for the acoustic indoor quality descriptors of public buildings are imposed. These refence values are in compliance with the national standards UNI 11532-1 and UNI 11532-2. Part two of the series standard, in particular, describes the procedures and gives limit values for the acoustic comfort descriptors for schools. Regarding schools, adequate acoustic comfort targets are required in terms of indoor noise level and acoustic quality. Indoor acoustic quality targets refer to reverberation time (RT), Clarity (C50) and/or speech intelligibility (STI). The limit values for these indoor acoustic quality parameters, established by the national standards, are related to the measurement methods results; however, it is necessary to use prediction methods to estimate these parameters during the design phase. The aim of this study is to verify the prediction method accuracy used to determine intelligibility score. The study was developed to model the existing calculation method of speech transmission index (STI) in Matlab software to determine the acoustic speech intelligibility in school classrooms. A school building located in central Italy, in the Marche Region, was taken as a case study. This research aims to determine a correlation factor between the results of predictions and measurement speech intelligibility methods.
Pages: 17 - 24