Nonlinear source-filter coupling due to the addition of a simplified vocal tract model for excised larynx experiments.
J Voice
; 27(3): 261-6, 2013 May.
Article
en En
| MEDLINE
| ID: mdl-23490131
ABSTRACT
OBJECTIVES:
Traditional excised larynx dissection and setup calls for the removal of all supraglottal structures, eliminating any source-filter interactions that measurably affect the acoustic properties of phonation. We introduce a simplified vocal tract model that can be used in the excised larynx experiments and tested the nonlinear source-filter interactions that are present with the addition of highly coupled, supraglottal structures.METHODS:
Aerodynamic and acoustic data were measured at phonation threshold pressure (PTP) and +25% PTP in 10 excised canine larynges using a modified dissection technique. PTP and phonation threshold flow (PTF) were defined as the pressure and flow at the phonation onset; phonation threshold power (PTW) is the product of these values. Data were recorded for four experimental conditions PTP without vocal tract; +25% PTP without vocal tract; PTP with vocal tract; and +25% PTP with vocal tract. Differences in PTP, PTF, and PTW were evaluated. For trials conducted at +25% PTP, differences in airflow were evaluated.RESULTS:
PTP (P = 0.009) and PTW (P = 0.002) were significantly reduced with the addition of the novel vocal tract. A reduction in PTF was also present with the vocal tract (P = 0.021), but airflow was not significantly reduced in +25% PTP trials (P = 0.196).CONCLUSION:
The proposed vocal tract can be used with complete larynges when conducting excised larynx experiments. The effects of nonlinear source-filter interaction were observed during trials with the vocal tract, as evidenced by changes in threshold aerodynamic parameters.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Fonación
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Pliegues Vocales
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Dinámicas no Lineales
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Laringe
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Modelos Anatómicos
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Modelos Biológicos
Tipo de estudio:
Risk_factors_studies
Límite:
Animals
Idioma:
En
Año:
2013
Tipo del documento:
Article