This paper illustrates variability of the speech to reverberation modulation energy ratio (SRMR). The presented experiments indicate SRMR inconsistencies per user, per utterance, and per microphone position. Additionally, the results show that the normalization available in the reference SRMR implementation does not limit the variability to an acceptable range. Further the paper presents a study of SRMR and reverberation time (RT) correlation. Experiments suggest that a precise relation between SRMR and RT can only be obtained for a specific utterance coming from a known user.
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