Abstract
Acoustic index variations due to small changes in an observation point in a concert hall were studied. Three kinds of methods were used in order to measure the acoustic indexes: (1) one point measurement using a single channel microphone; (2) binaural measurement using a dummy head microphone; and (3) the regular tetrahedron peak point method using a 4-channel microphone system. The acoustic index variations in each of the methods were analyzed. In addition, subjective experiments were performed in order to evaluate the effects of the variations. Compared to these measurements, problems with the acoustic indexes which were analyzed by each of the methods were found. One point measurement may incorrectly evaluate a concert hall.
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