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.

Authors: Abel, Jonathan S.; Huang, Patty
Affiliations: CCRMA, Stanford University; Universal Audio, Inc.(See document for exact affiliation information.)
AES Convention: 121 (October 2006) Paper Number: 6985
Publication Date: October 1, 2006
Subject: Signal Processing

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