SOUND FIELD RECONSTRUCTION AND EVALUATION OF THE WEST HALL AUDITORIUM, AT THE INSTITUTE OF TECHNOLOGY BANDUNG - INDONESIA

摘要

The West Hall, or renowned as Aula Barat, is one of the landmark buildings in Bandung, Indonesia. The hall is located at the entrance site of the Institute of Technology Bandung, side by side with her twin building, the East Hall (or Aula Timur). The buildings were erected in 1920, and designed by the Dutch's Architect, Henri Maclaine Pont. The hall has a traditional West Javanese roofing type, and a curved wooden structured, as shown in Figure 1a-c. The surface material of its ceiling, wall and floor are hardboard, mixture of plastered bricks and glass windows, and marble, respectively. The West Hall is usually used for speech activities such as conferences, general lectures, and university's formal ceremony, as well as to perform musical activities such as traditional musical performance, jazz performance, piano recital, etc. These made the West Hall a multipurpose hall or auditorium. With regard to this fact, research to study the acoustics performance of this hall was conducted. One of the purposes is to preserve the acoustic conditions in digital audio format documentation. A small part of the research is presented in this paper. The paper will discuss the acoustics condition of the West Hall, by analyzing the following 6 parameters: Early Decay Time (EDT), C80, D50, RASTI, IACC, and the Sound Pressure Level (SPL) distribution. The EDT was used to show the reverberation characteristics of the Hall, while the C80, D50 and RASTI were used to evaluate the intelligibility of the hall in term of musical performance (C80, clarity) and speech activity (D50 and RASTI). The spatial condition of the Hall was analyzed by means of its IACC values.