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Measures of the glottal source spectrum.

Jody Kreiman¹, Bruce R Gerratt, Norma Antoñanzas-Barroso

¹Division of Head and Neck Surgery, University of California, Los Angeles, School of Medicine, 31-24 Rehab Center, 1000 Veteran Avenue, Los Angeles, CA 90095-1794, USA. jkreiman@ucla.edu

Journal of Speech, Language, and Hearing Research : JSLHR

|June 1, 2007

Summary

Existing voice source spectral measures are redundant and do not capture spectral variability. These measures may not accurately predict voice quality due to inadequate modeling of higher frequencies.

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Area of Science:

Speech acoustics and voice production.
Phonetics and bioacoustics.
Voice signal analysis.

Background:

Quantifying voice source characteristics is crucial but methods remain unclear.
Existing measures of glottal source spectra lack standardization and clear interpretation.
Understanding voice source spectral properties is key to voice quality assessment.

Purpose of the Study:

To examine relationships among existing glottal source spectral measures.
To assess how these measures relate to overall spectral and glottal pulse shapes.
To identify optimal measures for capturing glottal pulse and spectrum shapes.

Main Methods:

Analysis of 78 spectral shape measures from 70 speakers.
Application of principal components analysis to measurement data.
Comparison of derived factors with oral speech spectra and glottal pulse factors.

Main Results:

High redundancy and overlap found among current source spectral slope measures.
Existing measures poorly represent spectral variability patterns.
Inadequate modeling of higher frequencies within the source spectrum by current measures.

Conclusions:

Current spectral measures fail to adequately quantify spectral variability.
This inadequacy may explain inconsistent findings on the perceptual importance of spectral slope.
Existing source spectral slope measures are unlikely to be reliable predictors of voice quality.