Assessment of speech intelligibility during different teaching activities in classrooms with and without acoustic treatment

dc.contributor.author Şaher, Konca
dc.contributor.author Bulunuz, Mizrap
dc.contributor.author Kelmendi, Jonida
dc.contributor.author Nas, Sezin
dc.contributor.other Interior Architecture and Environmental Design
dc.date.accessioned 2023-10-19T15:11:41Z
dc.date.available 2023-10-19T15:11:41Z
dc.date.issued 2023
dc.department-temp [Saher, Konca] Kadir Has Univ, Dept Interior Architecture & Environm Design, Kadir Has Caddesi, TR-34083 Istanbul, Turkiye; [Bulunuz, Mizrap; Kelmendi, Jonida] Bursa Uludag Univ, Fac Educ, E Blok 228, TR-16059 Bursa, Turkiye; [Nas, Sezin] Isik Univ, Dept Interior Architecture & Environm Design, TR-34980 Istanbul, Turkiye en_US
dc.description.abstract There is limited data for assessing speech intelligibility in real classrooms with realistic occupied noise levels and teacher's and students' speech levels for different teaching activities in Turkish secondary school classrooms. This study investigates the effect of reverberation time (RT), occupied noise levels and signal-to-noise ratio (SNR) on speech transmission index (STI) in real classrooms for instruction and group work. Noise levels were measured and STI values were calculated in two secondary school classrooms with RT of 0.88 s and 2.73 s. During instruction situation, calculated mean STI values were 0.63 (classroom with acoustic treatment) and 0.29 (classroom without acoustic treatment) for normal voice effort and 0.65 (classroom with acoustic treatment) and 0.39 (classroom without acoustic treatment) for raised voice effort. During group work, STI values ranged from 0.50 to 0.74 in classroom with acoustic treatment and from 0.01 to 0.34 in classroom without any acoustic treatment. SNR of 15 dBA is only approached in classroom with acoustic treatment during instruction situation. The effect of increasing SNR on STI is prominent in the classroom without acoustic treatment which already has low SNR values. The present results show that the classroom with acoustic treatment will have good speech intelligibility for instruction with normal vocal effort and for group work with raised vocal effort at 3 m distance. However, the classroom with no acoustic treatment will have STI values in the range of bad and poor intelligibility. The present results confirm the impact of SNR and RT on speech intelligibility and shows that RT value of minimum 0.8 s is optimal to have good speech intelligibility in a secondary school classroom of approximately 250 m3 with a capacity of 18 students.(c) 2023 Elsevier Ltd. All rights reserved. en_US
dc.description.sponsorship Scientific and Research Council of Turkey [1001, 114K738]; Project Title of Noise Pollution in School: Causes, Effects, and its Control en_US
dc.description.sponsorship This study was supported within the scope of The Scientific and Research Council of Turkey-1001 Research Grant Scheme under Project No. (114K738) and Project Title of Noise Pollution in School: Causes, Effects, and its Control. The authors would like to thank Prof. Dr. Ali Yurdun Orbak for his valuable contribution during the measurements in the school without acoustic treatment. en_US
dc.identifier.citationcount 0
dc.identifier.doi 10.1016/j.apacoust.2023.109346 en_US
dc.identifier.issn 0003-682X
dc.identifier.issn 1872-910X
dc.identifier.scopus 2-s2.0-85151552924 en_US
dc.identifier.scopusquality Q1
dc.identifier.uri https://doi.org/10.1016/j.apacoust.2023.109346
dc.identifier.uri https://hdl.handle.net/20.500.12469/5172
dc.identifier.volume 207 en_US
dc.identifier.wos WOS:000976020200001 en_US
dc.identifier.wosquality Q2
dc.khas 20231019-WoS en_US
dc.language.iso en en_US
dc.publisher Elsevier Sci Ltd en_US
dc.relation.ispartof Applied Acoustics en_US
dc.relation.publicationcategory Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı en_US
dc.rights info:eu-repo/semantics/closedAccess en_US
dc.scopus.citedbyCount 3
dc.subject Primary-School Teachers En_Us
dc.subject Room Acoustics En_Us
dc.subject Normal-Hearing En_Us
dc.subject Noise-Levels En_Us
dc.subject Reverberation En_Us
dc.subject Perception En_Us
dc.subject Parameters En_Us
dc.subject Design En_Us
dc.subject Discrimination En_Us
dc.subject Recognition En_Us
dc.subject Primary-School Teachers
dc.subject Room Acoustics
dc.subject Normal-Hearing
dc.subject Noise-Levels
dc.subject Reverberation
dc.subject Perception
dc.subject Classroom acoustics en_US
dc.subject Parameters
dc.subject Speech transmission index en_US
dc.subject Design
dc.subject Signal-to-noise ratio en_US
dc.subject Discrimination
dc.subject Secondary school classrooms en_US
dc.subject Recognition
dc.subject Speech intelligibility en_US
dc.title Assessment of speech intelligibility during different teaching activities in classrooms with and without acoustic treatment en_US
dc.type Article en_US
dc.wos.citedbyCount 1
dspace.entity.type Publication
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