Speech intelligibility for space vehicles, using nitrogen or helium as the inert gas.

@article{Cooke1966SpeechIF,
  title={Speech intelligibility for space vehicles, using nitrogen or helium as the inert gas.},
  author={Josiah Parsons Cooke and S. E. Beard},
  journal={The Journal of the Acoustical Society of America},
  year={1966},
  volume={40 6},
  pages={
          1450-3
        }
}
A laboratory investigation was carried out to help evaluate verbal‐communication intelligibility in a man‐rated altitude simulator when either helium or nitrogen was added to the oxygen atmosphere. Some eight operators and 37 male subjects were tested with a total of 16 500 random word events at pressures of 5 psia (pounds pressure per square inch, absolute), using 70:30 mixture of O2:He or O2:N2 mixtures and also 100% oxygen at 3.5 psia. An increased lack of intelligibility has been known to… CONTINUE READING
BETA