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Related Experiment Videos

Vocal tremor analysis with the Vocal Demodulator.

W S Winholtz1, L O Ramig

  • 1Recording and Research Center, Denver, CO.

Journal of Speech and Hearing Research
|June 1, 1992
PubMed
Summary

This study introduces the Vocal Demodulator, a new device for analyzing vocal tremor. It quantifies tremor components in voice signals, aiding in the diagnosis of vocal disorders.

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Area of Science:

  • Speech and Hearing Sciences
  • Biomedical Engineering
  • Acoustic Analysis

Background:

  • Vocal tremor significantly impacts vocal disorders, necessitating precise diagnostic tools.
  • Quantitative acoustic analysis offers potential for improved diagnosis and study of voice pathologies.

Purpose of the Study:

  • To introduce and validate a novel device, the Vocal Demodulator, for the quantitative analysis of vocal tremor.
  • To assess the device's capability in measuring low-frequency tremor components during sustained phonation.

Main Methods:

  • The Vocal Demodulator analyzes voice signals captured by a standard microphone.
  • It provides amplitude- and frequency-demodulated outputs, measuring tremor frequency and level (2.5-25 Hz).
  • Real-time display of five parameters: fundamental frequency (F0), amplitude/frequency modulation frequency, and amplitude/frequency modulation level.

Main Results:

  • Validation data from synthesized signals and human phonation (vocal tremor, vibrato, normal voice) are presented.
  • Calibration and reliability assessments confirm the device's accuracy.
  • The device successfully measures key tremor parameters in sustained phonation across a 70-1200 Hz F0 range.

Conclusions:

  • The Vocal Demodulator is a promising tool for quantitative acoustic analysis of vocal tremor.
  • It has significant potential for research and clinical applications in diagnosing and studying vocal disorders.

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