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Acoustic Characteristics in Epiglottic Cyst.

YeonWoo Lee1, GeunHyo Kim1, SooGeun Wang2

  • 1Department of Otorhinolaryngology-Head and Neck Surgery and Biomedical Research Institute, Pusan National University Hospital, Busan, South Korea.

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|May 8, 2018
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Summary

Large epiglottic cysts can alter vocal tract acoustics. This study found that surgery for these cysts significantly raised the first formant (F1) in the /a:/ vowel, impacting vocal tract resonance.

Keywords:
Epiglottic cystF1F2FormantJitterNoise-to-harmonic ratioShimmerVocal tractVowel

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Area of Science:

  • Otolaryngology
  • Speech Science
  • Acoustic Analysis

Background:

  • Epiglottic cysts can cause anatomical changes in the vocal tract.
  • These changes may affect the resonant properties of the vocal tract, influencing voice quality.
  • Understanding these effects is crucial for diagnosis and treatment.

Purpose of the Study:

  • To analyze acoustic characteristics of vocal tract deformation caused by epiglottic cysts.
  • To investigate the relationship between anatomical changes from cysts and vocal tract resonance.
  • To provide insights into the acoustic impact of epiglottic cysts.

Main Methods:

  • Eight male patients with epiglottic cysts were studied.
  • Acoustic parameters including jitter, shimmer, noise-to-harmonic ratio, and the first two formants (F1, F2) were measured.
  • Analysis was performed on sustained vowels /a:/, /e:/, /i:/, /o:/, /u:/ before and after laryngeal microsurgery.

Main Results:

  • A significant increase in the first formant (F1) frequency was observed for the /a:/ vowel post-surgery.
  • No significant differences were found in formant frequencies for other vowels.
  • Jitter, shimmer, and noise-to-harmonic ratio did not show significant changes after surgery.

Conclusions:

  • The study demonstrates that epiglottic cysts can alter vocal tract resonance, specifically affecting the F1 of the /a:/ vowel.
  • Surgical intervention for epiglottic cysts leads to measurable changes in vocal tract acoustic properties.
  • These findings can aid in understanding and analyzing vocal tract resonance alterations caused by epiglottic cysts.