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Investigation of the listening environment for lower grade students in elementary school using subjective tests

주관적 평가법을 이용한 초등학교 저학년 교실의 청취환경 조사

  • 박찬재 (충북대학교 건축공학과) ;
  • 한찬훈 (충북대학교 건축공학과)
  • Received : 2021.03.30
  • Accepted : 2021.05.20
  • Published : 2021.05.31

Abstract

The present study was conducted as a pilot investigation to suggest the standards of acoustic performance for classrooms suitable for incomplete hearing people such as children under 9 years of age. Subjective evaluations such as questionnaire and speech intelligibility test were conducted to 264 students at two elementary schools in Cheong-ju in order to analyze the characteristics of the listening environment in the classrooms of the lower grades in elementary school. The survey was undertaken with a total of 264 students at two elementary schools in Cheong-ju, and investigated their satisfaction with the classroom listening environment. As a result, students responded that the most helpful information type for understanding class content is the voice of teacher. In addition, the volume of the current teacher's voice is normal, and the level of clarity is highly satisfactory. As for the acoustic performance of the classroom, the opinion that the noise was normal and the reverberation was very short was found to be dominant in overall satisfaction with the listening environment. Meanwhile, as a result of speech intelligibility test using the word list selected for the lower grade students of elementary school, it could be inferred that the longitudinal axis distance from the sound source in the case of 8-year-olds is a factor that affects speech recognition.

본 연구는 만 9세 이하 아동과 같은 청력 비완전자에게 적합한 교실의 음향성능 기준을 제시하기 위한 사전연구로써 수행되었다. 이를 위해 초등학교 저학년 교실의 청취환경 특성을 분석하기 위하여 청주시 소재 초등학교 2곳에서 총 264명의 학생을 대상으로 설문조사 및 음성명료도 평가와 같은 주관적 평가를 진행했다. 설문조사 결과 학생들이 수업 내용 이해에 가장 도움이 되는 정보형식은 교사의 음성이라고 응답했다. 또한 현재 교사의 음성에 대해 음량은 '보통' 수준이며 명료도에는 높은 만족도를 보이고 있었다. 교실의 음향성능에 대해서도 소음의 경우 '보통'이며 잔향감은 '매우 짧다'는 의견이 가장 많아서 청취환경에 대한 전반적인 만족도가 높은 편인 것으로 파악되었다. 또한 초등학교 저학년 학생들을 위해 선별된 시험용 단어목록을 이용해 음성명료도 평가를 수행한 결과 만 8세 아동의 경우 음원으로부터의 종축거리가 음성인지에 영향을 미치는 요인임을 유추해볼 수 있었다.

Keywords

Acknowledgement

본 논문은 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구입니다(NRF-2020R1A2 C2009963).

References

  1. ANSI/ASA S12.60, Acoustical Performance Criteria, Design Requirements and Guidelines for Schools, American National Standard, 2010.
  2. Building Bulletin 93, "Acoustic design of schools," Department for Education and Employment, 2011.
  3. C. J. Park, Establishment of the acoustical performance criteria for middle and high school classrooms (in Korean), (Ph.D. thesis, Chungbuk National University, 2014).
  4. C. J. Park, B. G. Kim, and C. H. Haan, "Investigation of the listening environment of classrooms for elderly people using speech intelligibility tests" (in Korean), J. Acoust. Soc. Kr. 40, 18-30 (2021).
  5. M. Nilsson, S. D. Soli, and J. Sullivan, "Development of the hearing in noise test for the measurement of speech reception thresholds in quiet and in noise," J. Acoust. Soc. Am. 95, 1085-1099 (1994). https://doi.org/10.1121/1.408469
  6. B. B. Peggy, D. S. Sigfrid, and S. Anne, "Classroom acoustics II : Acoustical barriers to learning," Technical Committee on Speech Communication of the Acoustical Society of America, Tech. Rep., 2002.
  7. Ministry of Education of the Republic of Korea, "School health act enforcement rule," Student Health Policy Division, 2019.
  8. S. B. Lee, M. J. Kim, and H. S. Yang, "Characteristics of acoustic indicators evaluating speech intelligibility in Korean elementary school classrooms," Trans. Korean Soc. Noise Vib. Eng. 25, 462-469 (2015). https://doi.org/10.5050/KSNVE.2015.25.7.462
  9. D. J. Ryu, C. J. Park, and C. H. Haan, "Interior surface treatment guidelines for classrooms according to the acoustical performance criteria" (in Korean), J. Acoust. Soc. Kr. 35, 92-101 (2016). https://doi.org/10.7776/ASK.2016.35.2.092
  10. C. S. Yoon, S. W. Kim, and Y. K. Oh, "A study on the standardization of articulation testing method and its evaluation suitable for Korean language (I) - Concentrated on the proposal of articulation testing standard" (in Korean), J. Archi. Inst. Kr. 20, 117-125 (1988).
  11. C. S. Yoon, S. W. Kim, and Y. K. Oh, "A study on the standardization of articulation testing method and its evaluation suitable for Korean Language (II) - Evaluation of the proposed articulation testing standard" (in Korean), J. Archi. Inst. Kr. 21, 95-108 (1989).
  12. B. W. Kim, J. J. Kim, S. T. Kim, and Y. J. Lee, "A study on the design and the construction of a Korean speech DB for common use" (in Korean), J. Acoust. Soc. Kr. 16, 35-41 (1997).
  13. J. J. Oh, Development of the lists of phonetically - balanced one-syllable words for kindergarteners and school aged children, (Master thesis, Hallym University, 2004).
  14. D. Egan, Architectural Acoustics (J. Ross Publishing, Florida, 2007), pp. 83.
  15. K. S. Pearsons, R. L. Bennett, and S. Fidell, Speech levels in various noise environments, U.S. Environmental Protection Agency, 1977.