MEASUREMENT OF SOUND TRANSMISSION BY HALL DOORS

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 (Tsub), (4) interaural time delay (τIACC), and (5) the width of the IACC function (WIACC). In order to describe subjective responses in the receiving room, not only the difference of SPL but also other factors, for example IACC, and Tsub, can be measured at the same time.