Academic Journal
Examining speech transmission index thresholds for Mandarin speech intelligibility in university classrooms.
| Τίτλος: | Examining speech transmission index thresholds for Mandarin speech intelligibility in university classrooms. |
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| Συγγραφείς: | Zhu, Peisheng, Tao, Wanqi, Mo, Fangshuo, Han, Xiaodi, Lu, Xiaodong, Zhang, Hongchi |
| Πηγή: | Journal of the Acoustical Society of America; Aug2026, Vol. 160 Issue 2, p904-919, 16p |
| Θεματικοί όροι: | Intelligibility of speech, Classrooms, Architectural acoustics, Acoustical engineering |
| Περίληψη: | The speech transmission index (STI) is the most widely used objective metric for speech intelligibility evaluation in enclosed spaces. STI thresholds specify the minimum values needed for specific intelligibility levels and serve as the basis for relevant room-acoustics standards. Although the International Electrotechnical Commission [IEC 60268-16, Sound System Equipment—Part 16: Objective Rating of Speech Intelligibility by Speech Transmission Index (2020)] permits application-specific thresholds, systematic investigations remain scarce. In this study, university classrooms were examined as representative lecture rooms. Listening conditions with continuously varying STI values over a broad range were established using acoustic characteristics measured at 24 locations across 12 university classrooms. The classic five-point qualification scale framework was employed to derive Mandarin speech intelligibility thresholds using the noninteger rank sum ratio and binary response methods. Results showed notable differences between the two methods under poor listening conditions (maximum difference of 0.07), whereas the thresholds converged under better conditions. An STI threshold of 0.59 is recommended as the minimum acceptable criterion for university classrooms, corresponding to 89.6% intelligibility on phonetically balanced syllable lists. For optimal conditions, an STI value of 0.72 (94.5% intelligibility) is proposed. These thresholds provide practical guidance for classroom acoustic design and contribute to the refinement of room-acoustics standards tailored to university classrooms where Mandarin is spoken. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of the Acoustical Society of America is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Βάση Δεδομένων: | Complementary Index |
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| Items | – Name: Title Label: Title Group: Ti Data: Examining speech transmission index thresholds for Mandarin speech intelligibility in university classrooms. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Zhu%2C+Peisheng%22">Zhu, Peisheng</searchLink><br /><searchLink fieldCode="AR" term="%22Tao%2C+Wanqi%22">Tao, Wanqi</searchLink><br /><searchLink fieldCode="AR" term="%22Mo%2C+Fangshuo%22">Mo, Fangshuo</searchLink><br /><searchLink fieldCode="AR" term="%22Han%2C+Xiaodi%22">Han, Xiaodi</searchLink><br /><searchLink fieldCode="AR" term="%22Lu%2C+Xiaodong%22">Lu, Xiaodong</searchLink><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Hongchi%22">Zhang, Hongchi</searchLink> – Name: TitleSource Label: Source Group: Src Data: Journal of the Acoustical Society of America; Aug2026, Vol. 160 Issue 2, p904-919, 16p – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Intelligibility+of+speech%22">Intelligibility of speech</searchLink><br /><searchLink fieldCode="DE" term="%22Classrooms%22">Classrooms</searchLink><br /><searchLink fieldCode="DE" term="%22Architectural+acoustics%22">Architectural acoustics</searchLink><br /><searchLink fieldCode="DE" term="%22Acoustical+engineering%22">Acoustical engineering</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The speech transmission index (STI) is the most widely used objective metric for speech intelligibility evaluation in enclosed spaces. STI thresholds specify the minimum values needed for specific intelligibility levels and serve as the basis for relevant room-acoustics standards. Although the International Electrotechnical Commission [IEC 60268-16, Sound System Equipment—Part 16: Objective Rating of Speech Intelligibility by Speech Transmission Index (2020)] permits application-specific thresholds, systematic investigations remain scarce. In this study, university classrooms were examined as representative lecture rooms. Listening conditions with continuously varying STI values over a broad range were established using acoustic characteristics measured at 24 locations across 12 university classrooms. The classic five-point qualification scale framework was employed to derive Mandarin speech intelligibility thresholds using the noninteger rank sum ratio and binary response methods. Results showed notable differences between the two methods under poor listening conditions (maximum difference of 0.07), whereas the thresholds converged under better conditions. An STI threshold of 0.59 is recommended as the minimum acceptable criterion for university classrooms, corresponding to 89.6% intelligibility on phonetically balanced syllable lists. For optimal conditions, an STI value of 0.72 (94.5% intelligibility) is proposed. These thresholds provide practical guidance for classroom acoustic design and contribute to the refinement of room-acoustics standards tailored to university classrooms where Mandarin is spoken. [ABSTRACT FROM AUTHOR] – Name: Abstract Label: Group: Ab Data: <i>Copyright of Journal of the Acoustical Society of America is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1121/10.0044499 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 16 StartPage: 904 Subjects: – SubjectFull: Intelligibility of speech Type: general – SubjectFull: Classrooms Type: general – SubjectFull: Architectural acoustics Type: general – SubjectFull: Acoustical engineering Type: general Titles: – TitleFull: Examining speech transmission index thresholds for Mandarin speech intelligibility in university classrooms. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Zhu, Peisheng – PersonEntity: Name: NameFull: Tao, Wanqi – PersonEntity: Name: NameFull: Mo, Fangshuo – PersonEntity: Name: NameFull: Han, Xiaodi – PersonEntity: Name: NameFull: Lu, Xiaodong – PersonEntity: Name: NameFull: Zhang, Hongchi IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 08 Text: Aug2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 00014966 Numbering: – Type: volume Value: 160 – Type: issue Value: 2 Titles: – TitleFull: Journal of the Acoustical Society of America Type: main |
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