MEASUREMENT OF SOUND TRANSMISSION BY HALL DOORS
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Acoustical properties of sound transmission through to all doors were investigated by measuring and calculating temporal and spatial factors in sound fields based on the model of the auditory-brain system (see reference [4]). To describe acoustical properties of the effect of doors, measurements were carried out obtaining five orthogonal factors. These are (1) sound pressure level (SPL), (2) the magnitude of the interaural cross-correlation (IACC), (3) subsequent reverberation time (T sub ), (4) interaural time delay (τ IACC ), and (5) the width of the IACC function (W IACC ) In order to describe subjective responses in the receiving room, not only the difference of SPL but also other factors, for example IACC, and T sub , can be measured at the same time.
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