AN EVALUATION OF THREE METHODS FOR UNSCRAMBLING HELIUM SPEECH PRODUCED AT DEPTHS OF 800 AND 1000 FEET
NAVAL SUBMARINE MEDICAL RESEARCH LAB GROTON CT
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Three systems for unscrambling helium speech produced at simulated depths of 800 and 1000 feet were evaluated. Recordings of the modified rhyme test read by an experienced male diver in a pressurized helium atmosphere were processed through three commercial frequency-shifting devices. The intelligibility of words passed through these systems was compared to scores obtained when the same helium recording was presented directly without alteration and when presented at one-half playback speed to groups of listeners. A within-subjects design was employed with suitable counterbalancing so that no word was heard twice by the same listener.
- Submarine Engineering
- Voice Communications