Speech Intelligibility of Aircrew Mask Communication Configurations in High-Noise Environments

Report No. ARL-TR-8168
Authors: Kimberly A Pollard; Lamar Garrett
Date/Pages: September 2017; 34 pages
Abstract: Three communication-system configurations were evaluated for speech intelligibility (SI) when used with the Joint Service Aircrew Mask for Strategic Aircraft and the Intercommunication Unit in high (85 and 95 dBA) background noise. Each communication system was used with foamearplugs or additional over-the-ear hearing protection and worn in combination with the protective hood. The goal of this evaluation was to compare communication-system configurations at high noise levels and to determine if the MIL-STD-1472G specifications for minimally acceptable speech intelligibility were being met (SI score ≥ 75%). The average SI scores for one system exceeded the minimally acceptable requirement, with average scores of 96% and 93% in 85 dBA and 95 dBA, respectively. Results are discussed and recommendations are provided.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2017