Accession Number:

AD0684773

Title:

AUDITORY FEEDBACK AND HELIUM-SPEECH

Descriptive Note:

Interim rept.

Corporate Author:

NAVAL SUBMARINE MEDICAL RESEARCH LAB GROTON CT

Personal Author(s):

Report Date:

1968-09-18

Pagination or Media Count:

11.0

Abstract:

Acoustic and intelligibility analyses were made of speech from five talkers breathing air or an HeO2 mixture, when their speech was or was not masked by loud noise of 95 decibels sound pressure level re .0002 microbar. Mean intelligibility scores were determined from responses by 26 listeners for both air and helium conditions when noise interfered with a talkers ability to hear his own speech. The average long-term power spectra of speech in air and speech in the helium-mix did not differ to an appreciable degree as had been expected. However, sound spectrograms for the helium-speech revealed upward frequency shifts as typically reported. But neither the average spectra nor the spectrograms of helium-speech and speech in air showed significant differences between talking in noise versus talking in quiet. It is concluded that alterations made to improve intelligibility while speaking in loud noise are not closely related to the acoustic variations analyzed in this investigation.

Subject Categories:

  • Submarine Engineering
  • Life Support Systems
  • Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE