Acoustic Discriminability of the Complex Phonation System in !Xóõ
1Department of Linguistics, University of California, San Diego, San Diego, California, USA, mgarellek@ucsd.edu.
Phonetica
|February 11, 2019
Summary
This study shows a psychoacoustic voice model accurately distinguishes six phonation types in !Xóõ. Acoustic analysis confirms these voice qualities are well-differentiated, even with dynamic changes.
Area of Science:
- Linguistics
- Acoustics
- Phonetics
Background:
- Phonation types involve complex vocal fold and supraglottal articulations.
- These articulations create multidimensional acoustic outputs.
- Acoustic modeling aids in understanding voice qualities.
Purpose of the Study:
- To evaluate the effectiveness of a psychoacoustic voice model in distinguishing !Xóõ phonation types.
- To analyze the acoustic parameters differentiating six phonation types in !Xóõ.
Main Methods:
- Utilized linear discriminant analysis on parameters from Kreiman et al.'s (2014) psychoacoustic voice model.
- Applied analysis to vowel parameters averaged over entire duration, first half, and final half.
- Investigated acoustic features including noise, spectral tilt, voicing amplitude/frequency, and formant changes.
Main Results:
- Achieved very high classification accuracy for all six !Xóõ phonation types.
- Acoustic measures averaged over the entire vowel duration were sufficient for distinguishing dynamic phonation types.
- Specific acoustic correlates, including noise and spectral changes, characterized "strident" vowels.
Conclusions:
- The psychoacoustic voice model effectively distinguishes !Xóõ phonation types.
- Acoustic parameters, particularly when averaged over the vowel, provide robust differentiation.
- Despite complexity, !Xóõ phonation contrasts are acoustically well-differentiated.
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