Manned Diving for Intelligibility Assessment of EBS-II Communication SystemComponents with Heliox and Nitrox Breathing Mediums

摘要

In October 1996, manned dives were conducted to evaluate the ability of the MK-24microphone and AN,POS headset communicationS components to produce intelligible speech while diving with the MK-16 MOD 0 Underwater Breathing ApparatuS (UBA) in closed and open circuit modes and while breathing HeD2 and N202 at various depths. The objectives were to evaluate the ability of the MK-24 microphone to produce intelligible speech with divers breathing ReD2 (0.7PPO) to 300 few and shallower both with and without a helium speech unscrambler (HSU) To evaluate the ability of the MK-24 microphone to produce intelligible speech with divers breathing N202 (0.7PP02) in closed circuit mode and air in the open-circuit mode to 150 few and shallower. To evaluate the ability of the AN/POS headset to reproduce intelligible speech from topside and between divers breathing ReD2 (0.7PPO(2)), N(2)0(2) (0.7PPO(2)) and air to 300 fsw and shallower both with an without an HSU.