Accession Number:

AD0711808

Title:

SUBGLOTTAL PRESSURE AND AIR FLOW MEASURES DURING VOCAL FRY PHONATION

Descriptive Note:

Corporate Author:

NAVAL SUBMARINE MEDICAL RESEARCH LAB GROTON CT

Personal Author(s):

Report Date:

1970-01-30

Pagination or Media Count:

14.0

Abstract:

The purpose of the study was to determine the subglottal pressures and rates of air flow produced during vocal fry phonation, a type of low frequency phonation characterized by a distinct popping sound. Simultaneous recordings of the voice signal, intratracheal air pressure, and rate of air flow, were obtained from five adult male subjects during three sustained phonations of the vowels a and i at three regions within their vocal fry range and two within their modalmidphonational range. The data were analyzed in terms of means fundamental frequency, mean subglottal pressure, and mean rate of air flow. The results indicate that the subglottal pressures produced during vocal fry phonation are significantly greater than those produced at adjacent low frequencies in modal range. In addition, it was shown that as the repetition rate of vocal fry increases, subglottal pressure tends to increase. Subglottal pressure decreased between the 10 and 30 percent frequencies of the modal phonational range. The subglottal pressures produced during phonation of a and i at any one vocal fry or modal phonation condition were not significantly different although those for the i tended to be slightly larger than for a. Furthermore, there was no difference in the subglottal pressure accompanying phonation of the vowel a as a result of inserting a mouthpiece into the subjects mouth to record air flow. Rate of air flow was found to be significantly lower in fry phonation and no relationship between flow rate and frequency in both ranges was found.

Subject Categories:

  • Anatomy and Physiology
  • Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE