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Article Dans Une Revue Journal of the Acoustical Society of America Année : 2015

Oscillation regimes produced by an alto saxophone: Influence of the control parameters and the bore inharmonicity

Jean-Baptiste Doc
Christophe Vergez

Résumé

The aim of this work is to highlight experimentally how inharmonicity of the bore resonance frequencies of an alto saxophone influence the nature of the oscillation regimes. A variable volume branching from the neck of an alto sax at an appropriate position allows to change the frequency of the first resonance independently from the second. A blowing machine with artificial lips is used to make the saxophone play while controlling independently the control parameters : the blowing pressure and an embouchure parameter. Values of these parameters are estimated experimentally through the measurement of the nonlinear characteristics linking the mean air flow blown into the instrument to the static pressure difference across the reed. Experiments with different values of the control parameters as well as of the inharmonicity produce different kinds of oscillation regimes. These regimes are categorized through the analysis of the pressure signal inside the mouthpiece. The resulting maps demonstrate that the emergence of quasi-periodic regimes, and their extent, depend on the level of inharmonicity, but also on the values of the control parameters. Periodic regimes playable by choosing appropriate values of the control parameters also differ according to the level of inharmonicity, a higher inharmonicity facilitating the emergence of the third register.
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Dates et versions

hal-01229842 , version 1 (17-11-2015)

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Jean-Baptiste Doc, Christophe Vergez. Oscillation regimes produced by an alto saxophone: Influence of the control parameters and the bore inharmonicity. Journal of the Acoustical Society of America, 2015, 137 (4), pp.1756. ⟨10.1121/1.4916197⟩. ⟨hal-01229842⟩
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