Underground spaces, such as underground shopping streets, underground garages and underground stations, are often flat in shape, namely the height is much smaller than the length and width. A marked feature of such spaces is that their sound fields are usually not diffuse and thus, the classic acoustic theories are generally inapplicable. This paper aims to experimentally examine the basic characteristics of sound fields in flat underground spaces. By considering two important acoustic indices, reverberation and sound pressure level distribution, the sound field of an underground garage space was measured and analysed. The analysis includes comparing the differences at various frequencies, and examining the distance and spatial variations with typical receivers.
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