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Electroglottographic wavegrams: a technique for visualizing vocal fold dynamics noninvasively.

Christian T Herbst1, W Tecumseh S Fitch, Jan G Svec

  • 1Laboratory of Biophysics, Department of Experimental Physics, Faculty of Science, Palacký University Olomouc, tř 17 listopadu 12, 771 46 Olomouc, Czech Republic. herbst@ccrma.stanford.edu

The Journal of the Acoustical Society of America
|November 30, 2010
PubMed
Summary

A novel electroglottographic wavegram visualizes vocal fold contact over time. This method reveals dynamic changes in vocal fold function, offering deeper insights than traditional analyses.

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Area of Science:

  • Bioacoustics
  • Speech Science
  • Laryngology

Background:

  • Electroglottography (EGG) measures vocal fold contact.
  • Analyzing EGG signals, including the derivative (DEGG), is crucial for understanding voice production.
  • Existing methods may not fully capture the dynamic nature of vocal fold contact.

Purpose of the Study:

  • Introduce a new visualization method for EGG and DEGG signals.
  • Enhance the assessment of vocal fold contact phenomena and their temporal variations.
  • Provide a more intuitive and informative analysis of glottal cycle dynamics.

Main Methods:

  • Developed the electroglottographic wavegram (wavegram) for EGG/DEGG signal analysis.
  • Measured time-varying fundamental frequency and identified individual glottal cycles.

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  • Normalized cycles for duration and amplitude, encoded signal values by color intensity, and concatenated cycles into a single image.

    • Main Results:

    • Wavegrams offer an intuitive display of vocal fold contact phenomena over time.
    • Variations in vocal fold contact are presented as sequential events, not isolated occurrences.
    • Systematic behavior of multiple DEGG peaks in wavegrams indicates subtle changes in vocal fold oscillatory regimes.

    Conclusions:

    • EGG wavegrams provide a novel and intuitive method for analyzing vocal fold contact.
    • This technique reveals dynamic, time-varying aspects of vocal fold function.
    • Wavegrams promise to yield more comprehensive information on vocal fold contacting and de-contacting events.