THE INTELLIGIBILITY OF HELIUM-SPEECH AS A FUNCTION OF SPEECH-TO-NOISE RATIO
NAVAL SUBMARINE MEDICAL RESEARCH LAB GROTON CT
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Three experiments compared the intelligibilities of helium-speech and normal speech masked by loud noise. Recordings were made of 5 talkers reading intelligibility word lists. Several panels of listeners heard these recordings masked by different levels of background noise. In Experiment 1, a fatigue effect seemed at first to be present differentially for the helium-speech, suggesting that short-term auditory fatigue may occur with helium. However, Experiment 2, designed to observe the effect on intelligibility of time during listening session that material was heard, refuted the notion of short-term fatigue effects. Experiment 3 incorporated results of the first two experiments to evaluate the effect of introducing varied levels of noise upon intelligibility of helium-speech and normal speech when order of presentation of gas mix was minimized.
- Submarine Engineering
- Life Support Systems
- Non-Radio Communications