Abstract
Most commonly used room acoustical measures are defined as the ratio between the energies in two time windows of the impulse response. In the Clarity Index and the Lateral Energy Fraction—supposed to be indicators for transparancy and spaciousness, respectively—the time window 0–80 ms plays a predominant role. When impulse responses are recorded along an array of closely spaced microphone positions and the above measures are calculated for each position, it appears that large fluctuations, up to a factor of 2, occur on a small spatial scale, e.g., in front of one and the same seat. These fluctuations are due to interference of early relections and can be physically well understood. It makes clear that the acoustic quality of a seat or row should not be based on one single measurement but on some spatial average, or that the measures should be redefined such that interference, to which our hearing mechanism apparently is not sensitive, is eliminated.
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