INVESTIGADORES
MINDLIN Bernardo Gabriel
congresos y reuniones científicas
Título:
Source-filter interactions in birds?Theory and experimental evidence
Autor/es:
MINDLIN G B; E. ARNEODO; GOLLER F
Lugar:
portland, USA
Reunión:
Conferencia; Meeting of the Acoustical Society of America; 2009
Institución organizadora:
acoustical society of america, AIP
Resumen:
The diverse acoustic behavior of birds presents a rich source of natural vocalizations, some of which most likely reflect source-filter interaction. However, very little experimental evidence exists for the specific role of such interactions in shaping acoustic behavior or the functional relevance of the resulting acoustic features. As an example of how theoretical approaches can help explain acoustic observations, we discuss coexisting limit cycles in relaxation oscillators subjected to delayed feedback. The dynamical solutions of a nonlinear relaxation oscillator subjected to a delayed feedback are analyzed, and the equations under study are designed to model some aspects of the source-tract interaction in birdsong production. By deriving a phase equation for the system and analyzing its solutions, we are able to unveil analytical relationships between the parameters that lead to a variety of solutions. In particular, we study the coexistence of periodic solutions for similar pitch and first formant frequencies. These dynamical situations allow us to interpret the frequency jumps present in some birdsong syllables as an effect of the interaction between the source and the tract.