Institute for Telecommunication Sciences
the research laboratory of the National Telecommunications and Information Administration

Stephen D. Voran

Abstract: We present an objective estimator of speech intelligibility that follows the paradigm of the Modified Rhyme Test (MRT). For each input, the estimator uses temporal correlations within articulation index bands to select one of six possible words from a list. The rate of successful word identification becomes the measure of speech intelligibility, as in the MRT. The estimator is called Articulation Band Correlation MRT (ABC-MRT). It consumes a tiny fraction of the resources required by MRT testing. ABC-MRT has been tested on a wide range of impaired speech recordings unseen during development. The resulting Pearson correlations between ABC-MRT and MRT results range from .95 to .99. These values exceed those of the other estimators tested.

Keywords: modified rhyme test (MRT); speech intelligibility; ABC-MRT; articulation index; objective estimator


To request a reprint of this report, contact:

Lilli Segre, Publications Officer
Institute for Telecommunication Sciences
(303) 497-3572
LSegre@ntia.gov

For technical information concerning this report, contact:

Stephen D. Voran
Institute for Telecommunication Sciences
(303) 497-3839
svoran@ntia.doc.gov


Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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