다목적 홀의 음향 최적화를 위한 개발 잔향가변장치의 흡음특성 평가

Abstract

The optimal reverberation time in a multi-purpose hall varies depending on the intended use (lecture, performance, etc.) and the type of performance (classical, musical, Korean traditional music, theater, etc.). In this study, devices for adjustable reverberation time (RT) were proposed. Sound absorption coefficients of four developed prototype devices in absorption and reflection modes were measured in the reverberation room according to the KS F 2805 and ISO 354. Additionally, to verify the variation range of RT developed device with the best reflection coefficient was installed in a small music practice room, and the variable range of RT was predicted and reviewed using a simulation tool. The results show that the sound absorption coefficient of device module-3 in absorption and reflection modes were 0.94 and 0.17 at 250 Hz, and 0.85 and 0.13 at 500 Hz, respectively. Additionally, the predicted results of the variable RT range between the two modes in an existing music practice room were 0.58 and 0.56 sec, at 250 and 500 Hz in octave band, respectively. An application of this is using developed devices in a multi-purpose hall for optimal reverberation environment.