An Evaluation of Three Methods for Unscrambling Helium Speech Produced at Depths of 800 and 1000 Feet

摘要

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. (Author)