Observable effects of sound source-tract coupling
Birdsong is a complex phenomenon, generated by a nonlinear vocal device capable of displaying complex solutions even under simple physiological motor commands. The variety of morphologies among bird species makes it an ideal model to study phenomena associated to the production of complex vocalizati...
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| Autores principales: | , , |
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| Formato: | CONF |
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_97816183_v1_n_p887_Arneodo |
| Aporte de: |
| Sumario: | Birdsong is a complex phenomenon, generated by a nonlinear vocal device capable of displaying complex solutions even under simple physiological motor commands. The variety of morphologies among bird species makes it an ideal model to study phenomena associated to the production of complex vocalizations. In the way of understanding how these varied, complex sounds are produced in the vocal organ, little has been learned about the acoustic effects introduced by the interaction between a sound source and a vocal tract. Inspired in the sound production mechanisms of songbirds, we propose a mathematical model of a vocal organ, in which a simple sound source interacts with a tract, leading to a delay differential equation. We explore this system numerically, focusing on the regions in parameter space where the frequencies of the oscillatory solutions of the uncoupled source are close to the resonances of the tract. In this way, we search for effects introduced by the soure-tract coupling which are observable in the acoustic features of the vocalizations produced in the system. By studying the system analytically, we put these effects in the context of the nonlinear dynamics of the model. |
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