Abstract
The perception of binaural sounds from the diffusing elements in concert halls has been investigated in terms of diffuseness. A rectangular recital hall with 480-seats was selected; the box-type diffusers, made of ceramic tiles with different heights, were installed for the lateral walls. The scattering coefficients of the diffuser profiles were more than 0.5 at the major frequencies. The frequency characteristics and the spatial distribution of the acoustical parameters were investigated at 17 positions. The early peaks were calculated as an in situ diffusivity index, which appeared as local maxima in the impulse responses. Auditory experiments at 8 receiver positions were carried out using the violin motif.
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