We describe the computer simulation of a one‐mass source together with a simple transmission line model for a psittacine bird. The syrinx is modeled as a lumped mass subject to elastic restoring forces and internal dissipation. Nonlinear interaction with the airflow follows the Ishizaka and Flanagan glottal model. This is also used to model complete closure of the syrinx: during closure an additional restoring force is added and dissipation is increased. During the whole closed phase the syringeal flow is zero, and consequently its spectrum is broadened and higher partials are generated. The vocal tract transmission lines are implemented with fractional delay lines and the transmission lines are assumed lossless. The beak is implemented as two complementary fifth order Butterworth filters. The pole trajectory for the filters approximates the nonlinear path of the beak cutoff as discussed by Fletcher.

Computer synthesis of bird songs and calls / M. Kahrs, F. Avanzini. - In: THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA. - ISSN 0001-4966. - 111:5(2002), p. 2392. ((Intervento presentato al 143. convegno Meeting of the Acoustical Society of America nel 2002 [10.1121/1.4778131].

Computer synthesis of bird songs and calls

F. Avanzini
2002

Abstract

We describe the computer simulation of a one‐mass source together with a simple transmission line model for a psittacine bird. The syrinx is modeled as a lumped mass subject to elastic restoring forces and internal dissipation. Nonlinear interaction with the airflow follows the Ishizaka and Flanagan glottal model. This is also used to model complete closure of the syrinx: during closure an additional restoring force is added and dissipation is increased. During the whole closed phase the syringeal flow is zero, and consequently its spectrum is broadened and higher partials are generated. The vocal tract transmission lines are implemented with fractional delay lines and the transmission lines are assumed lossless. The beak is implemented as two complementary fifth order Butterworth filters. The pole trajectory for the filters approximates the nonlinear path of the beak cutoff as discussed by Fletcher.
Settore INF/01 - Informatica
Settore ING-INF/05 - Sistemi di Elaborazione delle Informazioni
2002
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/660690
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