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A Simple, Robust Measure of Reverberation Echo Density

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A simple, robust method for measuring echo density from a reverberation impulse response is presented. Based on the property that a reverberant field takes on a Gaussian distribution once an acoustic space is fully mixed, the measure counts samples lying outside a standard deviation in a given impulse response window and normalizes by that expected for Gaussian noise. The measure is insensitive to equalization and level, and is seen to perform well on simulated data, artificial reverberation, and measurements of room impulse responses. Listening tests indicate a correlation between echo density measured in this way and perceived temporal quality or texture of the reverberation.

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Permalink: http://www.aes.org/e-lib/browse.cfm?elib=13819

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