Energy Decay Curve

For measuring and defining reverberation time , Schroeder introduced the so-called energy decay curve (EDC) which is the tail integral of the squared impulse response at time :

Thus, is the total amount of signal energy remaining in the reverberator impulse response at time . The EDC decays more smoothly than the impulse response itself, and so it is more useful than ordinary amplitude envelopes for estimating .

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About the Author: Julius Orion Smith III
Julius Smith's background is in electrical engineering (BS Rice 1975, PhD Stanford 1983). He is presently Professor of Music and Associate Professor (by courtesy) of Electrical Engineering at Stanford's Center for Computer Research in Music and Acoustics (CCRMA), teaching courses and pursuing research related to signal processing applied to music and audio systems. See http://ccrma.stanford.edu/~jos/ for details.