Comparison of the Korean and Chinese Speech Intelligibility with Increasing Sound Absorption in a Classroom

Ding, Wei; Park, Chan-Jae; Haan, Chan-Hoon

doi:10.7776/ask.2012.31.3.129

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…A previous study showed that Korean, English, and Chinese speech clarity can be different in the same space [23]. The effective factors for speech intelligibility may be different depending on the characteristics of each language.…”

Section: Previous Studiesmentioning

confidence: 99%

“…In a space with similar acoustical conditions, there are different factors that affect speech intelligibility, depending on the language, such as English, Chinese, and Korean [23]. Therefore, it has been proposed that acoustical environment standards should be established that are appropriate for the language used when designing school classrooms.…”

Section: Introductionmentioning

confidence: 99%

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Initial Study on the Reverberation Time Standard for the Korean Middle and High School Classrooms Using Speech Intelligibility Tests

Park

Haan

2021

Buildings

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The most important function of the classroom is to transmit educational information from teachers to students more accurately and clearly. The acoustical environment of the classroom thus has an important effect on the improvement of students’ learning ability. To provide an appropriate acoustical environment for learning to students, it is necessary to create an acoustical performance standard for classrooms and a guideline for designing classrooms. However, in Korea, there is not an acoustical standard for classrooms; thus, it is difficult to control and manage appropriate acoustical performance when designing and building classrooms. The present study aims to suggest acoustic performance standards for classrooms that are suitable for the Korean language. In order to perform this study, standard classrooms were created by standardizing architectural dimensions of 17 middle and high school classrooms in Cheong-ju. Speech intelligibility tests were conducted using three different languages including Korean, English, and Chinese. Twenty native speakers for each language were used as subjects for the speech intelligibility tests. Finally, auralized sound sources were created with five different conditions of reverberation time (0.47 s~1.22 s) by changing indoor sound absorption of a real classroom. Listening tests were undertaken by 52 Korean adults with normal hearing, using the auralized sound source. The results proved that the most appropriate reverberation time for learning was above 0.76 s. Based on the research findings, the ideal acoustical performance standard for classrooms in Korea is as follows: background noise is below 35 dBA, and reverberation time is below 0.80 s. It is also necessary that indoor sound absorption should be above 20% without sound absorption on side walls in order to satisfy with the acoustical performance standard.

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Section: Previous Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Initial Study on the Reverberation Time Standard for the Korean Middle and High School Classrooms Using Speech Intelligibility Tests

Park

Haan

2021

Buildings

Self Cite

View full text Add to dashboard Cite

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“…It was shown that factors affecting speech intelligibility differed depending on the pronunciation characteristics of the languages. Therefore, the acoustic standards for school classrooms should be set differently depending on the language used [13].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Appropriate Reverberation Time for Lower-Grade Elementary School Classrooms Using Speech Intelligibility Tests

Park

Haan

2022

Buildings

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Because speech recognition performance is significantly lower at the age of nine or younger, the acoustic performance standards of classrooms for young children should be investigated. This study derives the appropriate reverberation time for lower-grade elementary school classrooms in Korea. A virtual sound field was created by computer modeling using normalized classrooms of Korean elementary schools. A total of five classrooms with reverberation times from 0.6 s to 1.2 s were produced by varying the sound absorption coefficient of the ceiling. Auralized sounds were produced by synthesizing anechoic sounds of words in a virtual sound field. Speech intelligibility tests were undertaken with 20 young students, aged nine. As a result, it was concluded that the reverberation time suitable for lower-grade classrooms of elementary schools should be below 0.6 s because test scores were significantly lower when RT was longer than this value.

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Characteristics of Acoustic Indicators Evaluating Speech Intelligibility in Korean Elementary School Classrooms

Lee¹,

Kim²,

Yang³

2015

Transactions of the Korean Society for Noise and Vibration Engi

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This study was carried out to examine characteristics of various acoustic indicators evaluating speech intelligibility such as reverberation time(T30), D50, C50 and speech transmission index(STI) in Korean elementary school classrooms. Results showed that mean T30 at middle frequencies(500 Hz to 2000 Hz) measured in 9 classrooms was about 0.75 s, which exceeds a regulation specified on American National Standards(ANSI); 0.60 s. Mean D50, C50 and STI were 60 % to 66 %, +2 dB to +3 dB, and 0.65, respectively. The maximum difference in D50 and C50 according to different receiver points in a classroom was 13 % and 2.5 dB, while the maximum difference in T30 was 0.03 s. Whereas STI measured in classrooms has relatively low correlation with other indicators, correlation between D50 and C50 was high, R 2 =.9964. In addition, T30 and C50 were fitted well as logarithmic regression curve with R 2 =.9610. It was +3.73 dB in C50 and 68 % in D50 which are the value corresponding to 0.60 s in T30 on this curve.

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Comparison of the Korean and Chinese Speech Intelligibility with Increasing Sound Absorption in a Classroom

Cited by 4 publications

References 2 publications

Initial Study on the Reverberation Time Standard for the Korean Middle and High School Classrooms Using Speech Intelligibility Tests

Initial Study on the Reverberation Time Standard for the Korean Middle and High School Classrooms Using Speech Intelligibility Tests

Investigation of the Appropriate Reverberation Time for Lower-Grade Elementary School Classrooms Using Speech Intelligibility Tests

Characteristics of Acoustic Indicators Evaluating Speech Intelligibility in Korean Elementary School Classrooms

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