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2013 Vol.32, Issue 4 Preview Page
Effect of the Inter-aural Level Differences on the Speech Intelligibility Depending on the Room Absorption in Classrooms

실내 흡음에 따른 양이간 음량차가 강의실의 음성명료도에 미치는 영향

Chan-Jae Park
,
Chan-Hoon† Haan†
박 찬재
,
한 찬훈††
충북대학교 건축공학과
†교신저자. †Corresponding Author. 
31 July 2013. pp. 335-345
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Abstract

The present study investigates the effect of the inter-aural level difference(ILD) on the syllable articulation test in classrooms which can be occurred by the absorption of interior surfaces. In order to do this, the sound absorbing materials were installed in the classroom and sound pressure level(SPL) at each ear was measured using binaural recording systems. Also, syllable articulation tests were carried out at a classroom with and without sound absorption materials by 20 students who have normal hearing condition, in order to investigates the effect of the ILD on the speech intelligibility. As a result, it was found that the larger inter-aural level differences was occurred at the nearer positions to lateral walls after sound absorptions were applied to lateral walls in the classroom. At some places, the measured ILD was lager than JND of sound level (3dB). Also, it was shown that the correlation coefficient of inter-aural level difference with the score of syllable test has the significant result(-0.441). Thus, It is concluded that ILD can affect the subjective speech intelligibility in classrooms.

Keywords
Inter-aural level difference
Speech intelligibility
Syllable articulation test
Acoustic measurement
Correlation analysis
Classroom

본 논문은 교실 및 회의실과 같은 소규모 공간에서 건축 마감재료에 의해 발생할 수 있는 좌우귀의 음량 차이가 사람의 청각적 음성명료도에 미치는 영향에 대하여 규명하고자 하였다. 이를 위해 대학교 강의실의 좌,우 측벽에 흡음재를 설치하였으며, 양이 녹음 시스템을 이용하여 좌측귀와 우측귀의 음압레벨을 각각 측정하였다. 또한 흡음재를 설치하기 전과 후 강의실에서 정상 청력의 대학생 20명을 대상으로 음절테스트를 수행하여 양이간 음량차이에 따른 음성명료도를 조사하였다. 그 결과 측벽에 흡음재를 설치 한 후 벽체에 가까워질수록 양이간 음량차가 크게 발생한다는 점을 알 수 있었으며 일부 수음점에서는 최소변화감지폭인 3 dB 이상 차이가 발생하는 곳도 있었다. 또한 측정점별 양이간 음량차와 음절테스트 점수의 상관관계를 분석한 결과 상관관계 계수가 약 –0.441로 유의한 결과를 나타내었다. 따라서 양이간 음량차가 강의실의 음성명료도에 영향을 미칠 수 있음을 알 수 있었다.

키워드
양이간 음량차
음성명료도
음절테스트
음향성능 측정
상관관계 분석
강의실
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Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 32
  • No :4
  • Pages :335-345
  • Received Date : 2013-03-04
  • Revised Date : 2013-05-13
  • Accepted Date : 2013-06-18
  • DOI :https://doi.org/10.7776/ASK.2013.32.4.335
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