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Abstract
The paper relates to investigations made regarding the acoustics of the hall and the measures adopted to improve the same.
The three main factors responsible for acoustic condition, namely (a) the reverberation time, (b) the distribution of sound pressure level and (c) the noise level, were studied. Measurements were taken when the hall was completely empty. The intelligibility was found to be poor, the main cause being the excessive reverberation. Based on these results, an estimate was made of the reverberation time that may be expected after furnishing it with the chairs and with audience present. Attempt was made to provide as much of the additional absorption necessary, as was possible with such objects as carpets, curtains, hangings, etc. Only the remaining amount of absorption was provided by treating with acoustical tiles, without affecting the architecture of the hall.
Several sets of measurements were taken under different conditions of the hall during the execution of the suggestions and the results are also presented. These results, at each stage, are compared with the original estimate. The results of measurements made after the completion of the work are presented. The acoustic condition of the hall was found to be quite satisfactory after the modifications.