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Passive Attenuating Communication Earphone (PACE): Noise Attenuation and Speech Intelligibility Performance When Worn in Conjunction with the HGU- 56/P and HGU-55/P Flight Helmets.
| 题名： | Passive Attenuating Communication Earphone (PACE): Noise Attenuation and Speech Intelligibility Performance When Worn in Conjunction with the HGU- 56/P and HGU-55/P Flight Helmets. |
| 作者： | Gallagher, H. L. |
| 关键词： | Acoustic Attenuation; Communication And Radio Systems; Ear Protectors; Earphones; Flight Helmets; Helmet Configuration; Intelligibility; Speech |
| 摘要： | Noise attenuation and speech intelligibility measurements were conducted in accordance with American National Standards Institute (ANSI) S12.6 Methods for Measuring the Real-Ear Attenuation of Hearing Protectors and ANSI S3.2 Method for Measuring the Intelligibility of Speech over Communication Systems on the HGU-56/P and HGU-55/P flight helmets worn in conjunction with PACE in-the-ear, in-the-canal, and general purpose earplugs. The passive noise attenuation results for both helmets show an increase in attenuation across all frequencies from 125 to 8000 Hz with the PACE earplugs when compared to the helmet alone. Speech intelligibility results found average subject scores to be greater than 80% (necessary to meet air worthiness requirements) across all helmet configurations in the worst case noise condition. |
| 报告类型： | 科技报告 |
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