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

dc.contributor.authorSaher, Konca
dc.contributor.authorNas, Sezin
dc.contributor.buuauthorKelmendi, Jonida
dc.contributor.buuauthorBulunuz, Mizrap
dc.contributor.departmentBursa Uludağ Üniversitesi/Eğitim Fakültesi.
dc.date.accessioned2024-09-04T13:11:05Z
dc.date.available2024-09-04T13:11:05Z
dc.date.issued2023-04-05
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.
dc.description.sponsorship"Noise Pollution in School: Causes, Effects, and its Control"
dc.identifier.doi10.1016/j.apacoust.2023.109346
dc.identifier.issn0003-682X
dc.identifier.urihttps://doi.org/10.1016/j.apacoust.2023.109346
dc.identifier.urihttps://hdl.handle.net/11452/44322
dc.identifier.volume207
dc.identifier.wos000976020200001
dc.indexed.wosWOS.SCI
dc.language.isoen
dc.publisherElsevier Sci Ltd
dc.relation.journalApplied Acoustics
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi
dc.relation.tubitak1001 - 114K738
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectPrimary-school teachers
dc.subjectRoom acoustics
dc.subjectNormal-hearing
dc.subjectNoise-levels
dc.subjectReverberation
dc.subjectPerception
dc.subjectParameters
dc.subjectDesign
dc.subjectDiscrimination
dc.subjectRecognition
dc.subjectClassroom acoustics
dc.subjectSpeech transmission index
dc.subjectSignal-to-noise ratio
dc.subjectSecondary school classrooms
dc.subjectSpeech intelligibility
dc.subjectScience & technology
dc.subjectTechnology
dc.subjectAcoustics
dc.titleAssessment of speech intelligibility during different teaching activities in classrooms with and without acoustic treatment
dc.typeArticle
dspace.entity.typePublication

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