Accession Number:

AD0705410

Title:

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

Descriptive Note:

Interim rept.

Corporate Author:

NAVAL SUBMARINE MEDICAL RESEARCH LAB GROTON CT

Report Date:

1969-10-30

Pagination or Media Count:

11.0

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.

Subject Categories:

  • Submarine Engineering
  • Voice Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE