Fire Protection Research Foundation report: "Intelligibility of Fire Alarm and Emergency Communication Systems" (PDF, 7 MB)
Author: Casey C. Grant, P.E., Fire protection Research Foundation
Date of issue: November 2008

Foreword

Intelligibility is a measureable aspect of electronic voice transmission systems that indicates the degree that human listeners will be able to understand the voice messages transmitted through them. This study addresses the efficacy of testing the intelligibility of a fire alarm or emergency communications system, by testing available design guidance and recommending methods for the performance testing of voice communication intelligibility.

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