In this work an extended Reverberation Decay Tail (R_DT) metric is proposed and developed as a means of calculating the level of reverberation distortion in speech recordings. The metric, based on earlier research, is extended to operate on wideband speech and incorporates an improved perceptual model. The effectiveness of the measure as a predictor of reverberation, it`s robustness to common types of noise and performance comparisons with the original metric are evaluated experimentally through simulations. As an intrusive quality measure, potential applications include use as a research tool by audio forensic and signal processing experts working on the development of speech dereverberation algorithms.
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