Comparison of the acoustical performance of mosque geometry using computer model studies

Speech intelligibility is a major concern in mosque acoustical design. Diverse mosque geometric configurations exist varying from the classical rectangle to the octagon-shaped plan. This study investigates the acoustical performance of commonly built forms of mosques utilizing room-acoustics computer models. Simulation of sound fields of five simple forms is conducted for different religious activities and level of occupancy. The purpose is to identify the impact of the mosque geometry on its acoustics, particularly on the spatial distribution patterns of speech intelligibility in the absence of sound reinforcement systems. Speech intelligibility contours were quantified and compared to characterize acoustic merits, dissimilarities and overall performance. Insignificant differences were found. Of all the shapes, (standard designs) the octagonal mosque possesses the fewest merits. The investigation is expected to help architects to understand better the effect of early architectural design decisions with respect to form on mosque acoustics.