잔향가변장치 적용에 따른 다목적 음악연습실에서 음환경 변화특성 평가

Abstract

This study investigated the practical effects of the reverberation variable device on controlling reverberation time of the sound fields in a multi-purpose music practice room. The surface of the reverberation variable device can be changed to absorb or reflect the incident sounds by the integrated electronic control system. The developed devices was installed on the surfaces of a music practice room having a length and width of 13.5 m and 3.5 m, respectively, for practical verification. The reverberation variable devices in a total of 96 units were employed in the room with a surface area of 78 m2. Especially, 50 units and 46 units of device were installed on the walls and the ceiling, respectively. As a result, the maximum changed reverberation time by frequency bands was measured as 0.15 s at 125 Hz, 0.63 s at 250 Hz, 0.59 s at 500 Hz, 0.37 s at 1000 Hz, and 0.3 s at 2000 Hz. The reflection mode with all the reverberation variable devices in closed state showed the highest reverberation time of 1.29 s at 500 Hz. The sound absorption mode with all the reverberation variable devices in opened state showed the lowest reverberation time of 0.7 s at 500 Hz. According to the partial control, the reverberation time at 500 Hz was 0.89 s when half of the wall units were opened, and 0.81 s when the half of the ceiling units were opened. Additionally, the design application of the developed devices was examined in accordance with ISO 23591.