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

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dc.authorid0000-0001-6959-0385
dc.authorid0000-0002-6650-088X
dc.authorid0000-0002-0015-2501
dc.contributor.authorŞaher, Koncaen_US
dc.contributor.authorBulunuz, Mızrapen_US
dc.contributor.authorKelmendi, Jonidaen_US
dc.contributor.authorNas, Sezinen_US
dc.date.accessioned2023-04-12T09:12:00Z
dc.date.available2023-04-12T09:12:00Z
dc.date.issued2023-05
dc.departmentIşık Üniversitesi, Sanat, Tasarım ve Mimarlık Fakültesi, İç Mimarlık ve Çevre Tasarımı Bölümüen_US
dc.departmentIşık University, Faculty of Arts, Design and Architecture, Department of Interior Architecture and Environmental Designen_US
dc.descriptionThis 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.description.abstractThere 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.en_US
dc.description.sponsorshipScientific and Research Councilen_US
dc.description.versionPublisher's Versionen_US
dc.identifier.citationŞaher, K., Bulunuz, M., Kelmendi, J. & Nas, S. (2023). Assessment of speech intelligibility during different teaching activities in classrooms with and without acoustic treatment. Applied Acoustics, 207, 1-18. doi:10.1016/j.apacoust.2023.109346en_US
dc.identifier.doi10.1016/j.apacoust.2023.109346
dc.identifier.endpage18
dc.identifier.issn0003-682X
dc.identifier.issn1872-910X
dc.identifier.scopus2-s2.0-85151552924
dc.identifier.scopusqualityQ1
dc.identifier.startpage1
dc.identifier.urihttps://hdl.handle.net/11729/5518
dc.identifier.urihttp://dx.doi.org/10.1016/j.apacoust.2023.109346
dc.identifier.volume207
dc.identifier.wosWOS:000976020200001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.indekslendigikaynakScience Citation Index Expanded (SCI-EXPANDED)en_US
dc.institutionauthorNas, Sezinen_US
dc.institutionauthorid0000-0002-0015-2501
dc.language.isoenen_US
dc.peerreviewedYesen_US
dc.publicationstatusPublisheden_US
dc.publisherElsevier Ltden_US
dc.relation.ispartofApplied Acousticsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectClassroom acousticsen_US
dc.subjectSecondary school classroomsen_US
dc.subjectSignal-to-noise ratioen_US
dc.subjectSpeech intelligibilityen_US
dc.subjectSpeech transmission indexen_US
dc.subjectAcoustic noiseen_US
dc.subjectArchitectural acousticsen_US
dc.subjectReverberationen_US
dc.subjectSpeech communicationen_US
dc.subjectSpeech transmissionen_US
dc.subjectStudentsen_US
dc.subjectAcoustic treatmenten_US
dc.subjectGroup worken_US
dc.subjectIndex valuesen_US
dc.subjectNoise levelsen_US
dc.subjectReverberation timeen_US
dc.subjectSecondary school classroomen_US
dc.subjectSecondary schoolsen_US
dc.subjectTeaching activitiesen_US
dc.subjectSignal to noise ratioen_US
dc.subjectPrimary-school teachersen_US
dc.subjectRoom acousticsen_US
dc.subjectNormal-hearingen_US
dc.subjectPerceptionen_US
dc.subjectParametersen_US
dc.subjectDesignen_US
dc.subjectDiscriminationen_US
dc.subjectRecognitionen_US
dc.titleAssessment of speech intelligibility during different teaching activities in classrooms with and without acoustic treatmenten_US
dc.typeArticleen_US

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