INVESTIGADORES
MINDLIN Bernardo Gabriel
artículos
Título:
Acoustic signatures of sound source-tract coupling
Autor/es:
ARNEODO E; SANZ PERL Y; MINDLIN GB
Revista:
PHYSICAL REVIEW E
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2011 vol. 83 p. 1 - 9
ISSN:
1539-3755
Resumen:
Birdsong is a complex behavior, which results from the interaction between a nervous system and a
biomechanical peripheral device. While much has been learned about how complex sounds are generated in
the vocal organ, little has been learned about the signature on the vocalizations of the nonlinear effects introduced
by the acoustic interactions between a sound source and the vocal tract. The variety of morphologies among
bird species makes birdsong a most suitable model to study phenomena associated to the production of complex
vocalizations. Inspired by the sound production mechanisms of songbirds, in this work we study 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 the system numerically, and by taking it to the weakly nonlinear limit, we are able to examine
its periodic solutions analytically. By these means we are able to explore the dynamics of oscillatory solutions of
a sound source-tract coupled system, which are qualitatively different from those of a sound source-filter model
of a vocal organ. Nonlinear features of the solutions are proposed as the underlying mechanisms of observed
phenomena in birdsong, such as unilaterally produced ?frequency jumps,? enhancement of resonances, and the
shift of the fundamental frequency observed in heliox experiments.