축소모형법을 이용한 흡음재와 확산체 배치조건별 교실의 음향성능 측정 및 평가
The Measurements and Evaluations on the Configurations of Absorptive and Diffusing Treatments in Classrooms using a Scale Model
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The present study examines the effects of periodic type diffusers for producing the preferred acoustics for speech and determines the more successful configurations of sound-absorbing and diffusing treatments for achieving good acoustics in classrooms. The measurements were carried out in a 1/10 scale model classroom systematically adding diffusers to one or more of four surfaces of the room. A total of 13 combination of diffusers with absorptive treatments were investigated. Adding diffusers on the ceiling were more effective to increasing the early-arriving reflection energy(G50) than adding absorptive materials on the entire ceiling. The late arriving reflection energy(Glate) was decreased with increasing amounts of diffusing treatments of upper front or rear wall and this resulted in achieving higher early-to-late ratios(C50). Adding diffusers on the upper front wall(AC100DUFW26) achieved more uniform acoustical conditions over the receiver positions than adding diffusers on the upper rear wall(AC100DURW26). Adding diffusers on the ceiling and absorptive materials on the lower front wall(AC75DC25ALFW26) achieved better acoustical conditions than adding the absorptive materials on the entire ceiling and lower front wall(AC100ALFW26).
Abstract
The present study examines the effects of periodic type diffusers for producing the preferred acoustics for speech and determines the more successful configurations of sound-absorbing and diffusing treatments for achieving good acoustics in classrooms. The measurements were carried out in a 1/10 scale model classroom systematically adding diffusers to one or more of four surfaces of the room. A total of 13 combination of diffusers with absorptive treatments were investigated. Adding diffusers on the ceiling were more effective to increasing the early-arriving reflection energy(G50) than adding absorptive materials on the entire ceiling. The late arriving reflection energy(Glate) was decreased with increasing amounts of diffusing treatments of upper front or rear wall and this resulted in achieving higher early-to-late ratios(C50). Adding diffusers on the upper front wall(AC100DUFW26) achieved more uniform acoustical conditions over the receiver positions than adding diffusers on the upper rear wall(AC100DURW26). Adding diffusers on the ceiling and absorptive materials on the lower front wall(AC75DC25ALFW26) achieved better acoustical conditions than adding the absorptive materials on the entire ceiling and lower front wall(AC100ALFW26).
참고문헌 (7)
- J.S. Bradley, "Speech intelligibility studies in classrooms", J. Acoust. Soc. Am, 80, pp.846~854 (1986)
- J.S. Bradley, "On the combined effects of signal-to-noise ratio and room acoustics on speech intelligibility", J. Acoust. Soc. Am, 106, pp.1820~1828 (1999)
- J.S. Bradley, "On the importance of early reflections for speech in rooms", J. Acoust. Soc. Am, 106, pp.3233~3244 (2003)
- H. Sato, "Evaluation of acoustical conditions for speech communication in working elementary school classrooms", J. Acoust. Soc. Am, 123, pp.2064~2077 (2008)
- J.S. Bradley, "A just noticeable difference in C50 for Speech", Applied Acoustics, 58, pp.99~108 (1999)
- T.T. Cox, "The sensitivity of listeners to early sound field changes in auditoria", Acustica, 79, pp.27~41 (1993)
- 최영지, "1차 단순 확산체를 적용한 교실음향설계", 교육시설, 18(5), pp.3~11 (2011), 한국교육시설학회