#### 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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