AN EVALUATION OF THREE METHODS FOR UNSCRAMBLING HELIUM SPEECH PRODUCED AT DEPTHS OF 800 AND 1000 FEET

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
Oct 30, 1969
Accession Number
AD0705410

Entities

People

  • Joseph R. Duffy
  • Joseph S. Russotti

Organizations

  • Naval Submarine Medical Research Laboratory

Tags

Communities of Interest

  • Biomedical

DTIC Thesaurus Topics

  • Analysis Of Variance
  • Biomedical Research
  • Carbon Dioxide
  • Classification
  • Combinatorial Analysis
  • Frequency
  • Frequency Bands
  • Frequency Shift
  • Human Factors Engineering
  • Intelligibility
  • Microphones
  • Navy
  • Playback
  • Security
  • Submarines
  • Test And Evaluation
  • Word Lists

Readers

  • Brain and Cognitive Science; Experimental Psychology; Cognitive Neuroscience
  • Materials Science
  • Speech Processing/Speech Recognition.