Measurement and prediction of voice support and room gain in school classrooms

David Pelegrin-Garcia, Jonas Brunskog, Viveka Lyberg-Åhlander, Anders Löfqvist

Research output: Contribution to journalArticleScientificpeer-review

35 Citations (Scopus)


Objective acoustic parameters have been measured in 30 school classrooms. These parameters include usual descriptors of the acoustic quality from the listeners' standpoint, such as reverberation time, speech transmission index, and background noise level, and two descriptors of the acoustic properties for a speaker: Voice support and room gain. This paper describes the measurement method for these two parameters and presents a prediction model for voice support and room gain derived from the diffuse field theory. The voice support for medium-sized classrooms with volumes between 100 and 250 m(3) and good acoustical quality lies in the range between -14 and -9 dB, whereas the room gain is in the range between 0.2 and 0.5 dB. The prediction model for voice support describes the measurements in the classrooms with a coefficient of determination of 0.84 and a standard deviation of 1.2 dB. (C) 2012 Acoustical Society of America. [DOI: 10.1121/1.3665987]
Original languageEnglish
Pages (from-to)194–204
Number of pages11
JournalJournal of the Acoustical Society of America
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed


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