Low Variance Blind Estimation of the Reverberation Time

Conference: IWAENC 2012 - International Workshop on Acoustic Signal Enhancement
09/04/2012 - 09/06/2012 at Aachen, Germany

Proceedings: IWAENC 2012

Pages: 4Language: englishTyp: PDF

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López, Nicolás; Grenier, Yves (Institut Mines-Télécom - Telecom ParisTech - CNRS/LTCI - 37/39 rue Dareau, 75014 Paris, France)
Bourmeyster, Ivan (Arkamys - 31 rue Pouchet, 75017 Paris, France)

The reverberation time is a key feature for describing the acoustic properties of a reverberant room. It can be computed from a measured Room Impulse Response but in many applications it has to be estimated blindly. Existing blind methods give accurate estimates but they often exhibit high variance across different speakers. In this paper, a low variance blind estimator of the reverberation time is derived from the decay rate distribution of the signal. The influence of the reverberation time on the statistical moments of the distribution is analyzed and one relevant moment is taken as an estimator. The variance of the estimator is reduced thanks to a prewhitening filter and a modification of the decay rate distribution. Experimental results confirm the accuracy of the method when the observed signal is sufficiently long. Index Terms — Reverberation time, blind estimation, decay rate distribution, low variance