David J. Atkinson; Andrew A. Catellier

Abstract: This report describes a modified rhyme test (MRT) conducted to characterize the behavior of digital and analog communication in the presence of background noise and moderate RF channel degradation. This is done through the use of reference systems to provide a manufacturer-independent perspective on this issue.

Keywords: land mobile radio; intelligibility; noise; Project 25 (P25); vocoder; analog FM; fire service; LMR; modified rhyme test (MRT); public safety

For technical information concerning this report, contact:

Andrew A. Catellier
Institute for Telecommunication Sciences
(303) 497-4951

To request a reprint of this report, contact:

Lilli Segre, Publications Officer
Institute for Telecommunication Sciences
(303) 497-3572

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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