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Related Experiment Videos

Analysis of voice changes after thyroplasty using linear predictive coding

R L Plant1, A D Hillel, P F Waugh

  • 1Department of Otolaryngology-Head and Neck Surgery, University of Washington Medical Center, Seattle, U.S.A.

The Laryngoscope
|June 1, 1997
PubMed
Summary

Linear predictive coding, a voice analysis technique, effectively measures vocal quality in patients with vocal fold immobility. Pitch amplitude, derived from this method, correlated well with perceptual voice assessments and improved post-medialization.

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Area of Science:

  • Otolaryngology
  • Speech-Language Pathology
  • Acoustic Analysis

Background:

  • Objective measurement of vocal quality in severe voice disorders is challenging.
  • Linear predictive coding (LPC) shows promise for analyzing voice signals.
  • LPC estimates glottic excitation signals using inverse filtering.

Purpose of the Study:

  • To evaluate the utility of LPC in assessing voice disorders in patients with vocal fold immobility.
  • To determine the correlation between acoustic parameters and perceptual voice quality ratings.
  • To assess changes in vocal quality following vocal fold medialization surgery.

Main Methods:

  • Voice recordings were obtained from 16 patients undergoing vocal fold medialization and 10 control patients.
  • Linear predictive coding was applied to analyze voice samples.

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  • Three speech pathologists provided perceptual ratings of voice quality.
  • Five acoustic parameters, including pitch amplitude, were calculated.

    • Main Results:

    • Pitch amplitude demonstrated the best agreement with perceptual voice quality assessments.
    • Both pitch amplitude and perceptual voice quality ratings improved in patients who underwent vocal fold medialization.
    • Acoustic parameter analysis provided objective measures correlating with subjective listener evaluations.

    Conclusions:

    • The linear model of speech production and inverse filtering are valuable tools for quantifying vocal quality in vocal fold immobility.
    • Pitch amplitude is a reliable acoustic measure for assessing voice changes in this patient population.
    • Objective acoustic analysis complements subjective perceptual evaluation in voice disorder assessment.