Abstract
Complaints of perceived echoes at specific locations in a 21,000 seat fan-shaped auditorium have prompted the measurement and analysis of numerous impulse responses. The responses were first processed using the echo criterion of Niese, then using the criterion of Dietsch and Kraak. This paper compares the two criteria and explores their abilities to assess whether peaks and anomalies of the measured responses were likely to produce audible echoes in the hall. The Niese criterion was found to better predict the perception of echoes produced by broad irregular decay trends. The Dietsch and Kraak criterion was able to better predict echoes produced by sufficiently strong specular reflections. Neither criterion alone was able to fully characterize these perceptions. Results obtained for both criteria at various seat locations will be presented and compared with subjective findings.
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