AUDITORY FEEDBACK AND HELIUM-SPEECH
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 talker's 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 18, 1968
- Accession Number
- AD0684773
Entities
People
- James Willott
- Russell Sergeant
Organizations
- Naval Submarine Medical Research Laboratory