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Measurements and time-domain simulations of multiphonics in the trombone.

Lionel Velut 1 Christophe Vergez 1 Joël Gilbert 2
1 Sons
LMA - Laboratoire de Mécanique et d'Acoustique [Marseille] : UPR7051
Abstract : Multiphonic sounds of brass instruments are studied in this article. They are produced by playing a note on a brass instrument while simultaneously singing another note in the mouthpiece. This results in a peculiar sound, heard as a chord or a cluster of more than two notes in most cases. This effect is used in different artistic contexts. Measurements of the mouth pressure, the pressure inside the mouthpiece and the radiated sound are recorded while a trombone player performs a multiphonic, firstly by playing an F3 and singing a C4, then playing an F3 and singing a note with a decreasing pitch. Results highlight the quasi-periodic nature of the multiphonic sound and the appearance of combination tones due to intermodulation between the played and the sung sound. To assess the ability of a brass instrument physical model to reproduce the measured phenomenon, time-domain simulations of multiphonics are carried out. A trombone model consisting in an exciter and a resonator non-linearly coupled is forced while self-oscillating to reproduce simultaneous singing and playing. Comparison between simulated and measured signals is discussed. Spectral content of the simulated pressure match very well with the measured one, at the cost of a high forcing pressures.
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Soumis le : vendredi 4 novembre 2016 - 11:33:03
Dernière modification le : lundi 21 décembre 2020 - 15:34:09
Archivage à long terme le : : dimanche 5 février 2017 - 13:51:27



Lionel Velut, Christophe Vergez, Joël Gilbert. Measurements and time-domain simulations of multiphonics in the trombone.. Journal of the Acoustical Society of America, Acoustical Society of America, 2016, 140 (4), pp.2876. ⟨10.1121/1.4964634⟩. ⟨hal-01363547v2⟩



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