AES Journal Forum

Modeling the Proportion of Early and Late Energy in Two-Stage Reverberators

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The most efficient acoustic modeling reverberators use a two-stage model, producing detailed early reflections with generic late reflections. Most methods of this type do not accurately model energy flux in the late reverb module, hence its Clarity Index (C80) is inaccurate. C80 is a unit of measurement that quantifies the ratio of early to late reverb energy on a log scale. The authors propose an efficient method to model late reverb energy flux showing that it models C80 and related metrics, Definition (D50) and Centre Time (TS), with more than twice the accuracy of the baseline method. It was observed that the standard deviation for C80 was more than eight decibels across various listener positions in large rooms, indicating that it varies audibly with respect to location. The proposed method for computing energy modeling coefficients can be applied to existing hybrid acoustic modeling reverberators. This approach allows the listener and sound source to change locations in real time without using precomputed impulse responses.

JAES Volume 65 Issue 12 pp. 1017-1031; December 2017
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