Passive Noise Reduction Technology to Improve Speech Intelligibility and Reduce Noise for Pilot and Deck Crew Helmet Mounted Systems

RTH proposes the development of a new passive communications earplug that willprovide 12 dB of additional attenuation compared to traditional devices. The earplugmakes use of a novel attenuation concept that RTH is in the process of patenting.When worn in conjunction with earmuffs or helmets, the total attenuation providedwill be over 45 dBA. The communications earplug, named the "EOV-Plug," will provide auniversal fit. Therefore, expensive and time-consuming ear canal impressions will notbe needed. Due to the unique design of the EOV-Plug, the device will be safer to usethan custom-molded earplugs. The EOV-Plug mitigates the occlusion effect and mayimprove attenuation limitations of hearing protectors due to bone conduction. TheEOV-Plug is compatible with standard earcups, and will be available with and withoutcommunications capability. The use of the EOV-Plug with earmuffs or helmets will provide superior passiveattenuation to any system on the market. The system will have applications in:civilian and military aircraft environments, manufacturing plants, constructionsites, mining environments, and other environments where noise protection is desired.The improved attenuation results in superior protection from hearing trauma andimproved speech intelligibility.