Comparison of Two Types of Combined Measures, STI and U50, for Predicting Speech Intelligibility in Classrooms
The present study reports on the speech intelligibility as measured by speech transmission index (STI) and useful-to-detrimental sound ratios ($U_{50}$) in university classrooms. Acoustic measurements were made in 12 quietly occupied university classrooms. The measured impulse responses of the class...
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Institute of Fundamental Technological Research Polish Academy of Sciences
2017-07-01
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| Series: | Archives of Acoustics |
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| Online Access: | https://acoustics.ippt.pan.pl/index.php/aa/article/view/1942 |
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| author | Young-Ji CHOI |
| author_facet | Young-Ji CHOI |
| author_sort | Young-Ji CHOI |
| collection | DOAJ |
| description | The present study reports on the speech intelligibility as measured by speech transmission index (STI) and useful-to-detrimental sound ratios ($U_{50}$) in university classrooms. Acoustic measurements were made in 12 quietly occupied university classrooms. The measured impulse responses of the classrooms were used to determine the modulation transfer function, $m(F)$, for the STI calculation according to IEC 60268-16. $U_{50}$ values were determined from both signal-to-noise ratios (SNR) and $C_{50}$ values. The mean STI and frequency-weighted $U_{50}$ values for the 12 occupied classrooms were strongly linearly related. The results showed that classrooms with $U_{50}$ values of about +0.5 dB correspond to STI values of 0.60, indicating ‘good’ acoustical conditions for speech intelligibility. The results illustrate that the $U_{50}$ measure can be a more practically useful means of assessing and understanding room acoustics conditions for real speech communication in active classrooms. |
| format | Article |
| id | doaj-art-fef5f9275cc149eba41d9c9cc10ac6a0 |
| institution | Matheson Library |
| issn | 0137-5075 2300-262X |
| language | English |
| publishDate | 2017-07-01 |
| publisher | Institute of Fundamental Technological Research Polish Academy of Sciences |
| record_format | Article |
| series | Archives of Acoustics |
| spelling | doaj-art-fef5f9275cc149eba41d9c9cc10ac6a02025-08-03T00:30:34ZengInstitute of Fundamental Technological Research Polish Academy of SciencesArchives of Acoustics0137-50752300-262X2017-07-0142310.1515/aoa-2017-0056Comparison of Two Types of Combined Measures, STI and U50, for Predicting Speech Intelligibility in ClassroomsYoung-Ji CHOI0Kangwon National UniversityThe present study reports on the speech intelligibility as measured by speech transmission index (STI) and useful-to-detrimental sound ratios ($U_{50}$) in university classrooms. Acoustic measurements were made in 12 quietly occupied university classrooms. The measured impulse responses of the classrooms were used to determine the modulation transfer function, $m(F)$, for the STI calculation according to IEC 60268-16. $U_{50}$ values were determined from both signal-to-noise ratios (SNR) and $C_{50}$ values. The mean STI and frequency-weighted $U_{50}$ values for the 12 occupied classrooms were strongly linearly related. The results showed that classrooms with $U_{50}$ values of about +0.5 dB correspond to STI values of 0.60, indicating ‘good’ acoustical conditions for speech intelligibility. The results illustrate that the $U_{50}$ measure can be a more practically useful means of assessing and understanding room acoustics conditions for real speech communication in active classrooms.https://acoustics.ippt.pan.pl/index.php/aa/article/view/1942speech intelligibilityspeech transmission indexuseful-to-detrimental sound ratiosclassrooms |
| spellingShingle | Young-Ji CHOI Comparison of Two Types of Combined Measures, STI and U50, for Predicting Speech Intelligibility in Classrooms Archives of Acoustics speech intelligibility speech transmission index useful-to-detrimental sound ratios classrooms |
| title | Comparison of Two Types of Combined Measures, STI and U50, for Predicting Speech Intelligibility in Classrooms |
| title_full | Comparison of Two Types of Combined Measures, STI and U50, for Predicting Speech Intelligibility in Classrooms |
| title_fullStr | Comparison of Two Types of Combined Measures, STI and U50, for Predicting Speech Intelligibility in Classrooms |
| title_full_unstemmed | Comparison of Two Types of Combined Measures, STI and U50, for Predicting Speech Intelligibility in Classrooms |
| title_short | Comparison of Two Types of Combined Measures, STI and U50, for Predicting Speech Intelligibility in Classrooms |
| title_sort | comparison of two types of combined measures sti and u50 for predicting speech intelligibility in classrooms |
| topic | speech intelligibility speech transmission index useful-to-detrimental sound ratios classrooms |
| url | https://acoustics.ippt.pan.pl/index.php/aa/article/view/1942 |
| work_keys_str_mv | AT youngjichoi comparisonoftwotypesofcombinedmeasuresstiandu50forpredictingspeechintelligibilityinclassrooms |