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Speech Transmission Index criteria for open plan classrooms in British primary schools

Greenland, EE; Shield, BM; Dockrell, JE; (2009) Speech Transmission Index criteria for open plan classrooms in British primary schools. In: (pp. pp. 1866-1874).

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Abstract

Open plan classrooms are becoming increasingly popular in new school design in the UK. Speech Transmission Index (STI) measurements were carried out in 42 open plan classbases in British primary schools to assess compliance against acoustic performance standards defined in Building Bulletin 93 (BB93)1. The BB931 criterion for speech intelligibility within open plan classbases (STI > 0.6) is intended to achieve 'good' speech intelligibility, as described by the ISO-99212 standardised rating scale. This paper explores the scope of the rating scale and hence the suitability of the BB931 criterion for listeners in a primary school setting. Consideration is given to both age and listening proficiency of a typical primary school audience (students), and typical vocal effort of the talker (teacher). The relationship between measured STI, speech-to-noise ratio and reverberation time was investigated using multiple regression analysis. From this, alternative STI design criteria are proposed, based on acoustic requirements for different age groups to achieve equivalent subjective speech intelligibility scores (as established by others). STI requirements for learners with English as an additional language are also considered.

Type: Proceedings paper
Title: Speech Transmission Index criteria for open plan classrooms in British primary schools
ISBN-13: 9781615676903
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Education
UCL > Provost and Vice Provost Offices > School of Education > UCL Institute of Education
UCL > Provost and Vice Provost Offices > School of Education > UCL Institute of Education > IOE - Psychology and Human Development
URI: http://discovery.ucl.ac.uk/id/eprint/1554525
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