Abstract
Eastern Mediterranean University’s Lala Mustafa Paşa hall is a multipurpose auditorium with conflicting functions. It is used for lectures, graduation ceremonies, music performances, shows, and sports. Thus, it is necessary to provide both speech intelligibility and quality sound. Many complaints were made regarding the long reverberation and echoes in the hall. To find the optimum solution for all of these conflicting uses, a survey of the acoustic parameters for music and speech was conducted, the criteria for which were identified. Measurements of these parameters were taken for the unoccupied hall. It was found that the acoustic conditions for both speech and music were in a critical condition in the hall. A simulation program was used to find a suitable solution, and various solutions were tested. The optimum solution was found to be the use of fireproof pyramidal melamine plates on the ceiling, and melamine plates with fireproof textile on the front surface with an air cavity on the walls at the rear. The long sidewalls at various levels on the tribunes were kept untreated. These measures satisfy the criteria for both music and speech without disrupting the sports activities.
Highlights
Eastern Mediterranean University’s indoor sports hall, Lala Mustafa Pasa, is used as a multipurpose auditorium
In view of the complaints that were received about the poor quality of sound, it was considered to be important to find the optimum solution for these conflicting uses
The results show that except for points near the speaker, speech intelligibility is very poor
Summary
Eastern Mediterranean University’s indoor sports hall, Lala Mustafa Pasa, is used as a multipurpose auditorium. Since it is not practical to fit variable sound reflectors and absorbers to this hall, the authors adopted the optimum reverberation for the mid frequencies in the range of 1.6 to 1.8 s [28], 1.4 to 1.9 s for the early decay time, and a bass ratio greater than 1.0. Speech Transmission Index (STI) is a measure of the speech intelligibility in a room and is judged as unintelligible between 0.0 to 0.3, poor between 0.3 to 0.45, fair between 0.45 to 0.6, good between 0.6 to 0.75, and excellent when > 0.75. Impulse to noise ratio (INR) is defined as the logarithmic ratio of the maximum impulse response level and the noise level and reflects the decay range This parameter is not a measure of room acoustics, it indicates whether the related measurements are correct.
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