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Estimation of Source-Filter Interaction Regions Based on Electroglottography.

Anil Palaparthi1, Lynn Maxfield2, Ingo R Titze3

  • 1National Center for Voice and Speech, The University of Utah, Salt Lake City, Utah; Department of Bioengineering, The University of Utah, Salt Lake City, Utah.

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Summary
This summary is machine-generated.

Acoustic airway pressures affect vocal fold vibration, especially when source harmonics align with airway resonances. This study quantifies these source-filter interactions using a novel algorithm analyzing vocal fold contact patterns.

Keywords:
ElectroglottographyQuasi-open quotientSource-filter interactionStep detectionVoice production

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Area of Science:

  • Acoustics
  • Bioengineering
  • Speech Science

Background:

  • Source-filter interaction describes how airway pressures influence vocal fold function.
  • This phenomenon is pronounced when vocal source harmonics align with airway resonances.

Purpose of the Study:

  • To systematically investigate the impact of acoustic airway pressures on vocal fold vibration patterns.
  • To develop and validate an algorithm for detecting vocal fold vibration changes due to source-filter interaction.

Main Methods:

  • Human subjects phonated through tubes of varying lengths to alter supraglottal vocal tract length.
  • An electroglottograph-derived quasi-open quotient was used to analyze vocal fold contact area changes.
  • A novel algorithm identified sudden changes in vocal fold contact patterns indicative of source-filter interaction.

Main Results:

  • The developed algorithm accurately identified quantal changes in vocal fold contact patterns during ascending glides (89% male, 84.8% female).
  • The algorithm also showed high accuracy for descending glides (84% male, 81.1% female).
  • Performance was compared to a previously established fundamental frequency-based algorithm.

Conclusions:

  • Acoustic airway pressures significantly influence vocal fold vibration patterns.
  • The developed algorithm effectively detects source-filter interaction by analyzing vocal fold contact patterns.
  • This method provides a robust tool for studying voice production dynamics.