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A Chaotic Approach to Glottal Gap Voice
Katerina A Smereka1, Colbey Johnson1, Alexa Q Guastello1
1Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin.
Summary
Glottic insufficiency, or glottal gap, introduces nonlinearity in voice production. This study quantifies glottal gap voice characteristics, revealing correlations between gap size and acoustic parameters.
Area of Science:
- Laryngology
- Acoustic analysis
- Speech production
Background:
- Airway glottic insufficiency (glottal gap) can cause breathy voice.
- Glottal gap may introduce nonlinearity into speech production.
Purpose of the Study:
- To characterize the chaotic and acoustic profile of glottal gap voice.
- To investigate the impact of posterior glottal gap size on voice production.
Main Methods:
- Excised canine larynges were used in a quasi-experimental study.
- A metal shim created posterior glottal gaps from 0 to 3.5 mm.
- Phonation was analyzed for cepstral peak prominence (CPP), harmonics-to-noise ratio (HNR), and correlation dimension.
Main Results:
- Significant differences in CPP, HNR, and correlation dimension were found across glottal gap sizes.
- Larger glottal gaps correlated positively with correlation dimension.
- Larger glottal gaps correlated negatively with CPP and HNR.
Conclusions:
- Glottic insufficiency is a source of phonation nonlinearity.
- Nonlinear dynamic analysis offers quantitative insights into glottal gap voice.
- Further research on glottal gap and correlation dimension is recommended.
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