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Shock Waves in Trombones

Type

text
 

Genre(s)

article
 

Forme(s)

document numérique
 

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Identification

Titre

Shock Waves in Trombones
 

Nom(s)

Hirschberg, Abraham (auteur)
 
Gilbert, Joël (auteur)
 
Msallam, Régis (auteur)
 
Wijnands, A. P. J. (auteur)
 

Publication

1995
 

Description

Sujet(s)

acoustique instrumentale   linear model   wind instruments
 

Résumé

Based on physical models of musical instruments and of the human voice, a new generation of sound syntesizers is born: virtual instruments. The models used for wind-instruments are simple feedback loops in uhich a non-linear sound source drives a linear,filter representing the pipe of the instrument. While very rewarding musical sounds have been obtained with these models, it has become obvious that some essential phenomena escape such a description. In particular the brightness of the sound generated by trombones is expected to be due to the essential non-linearity of the wave propagation in the pipe. At fortissimo levels this leads to shock wave formation observed in our experiments both from pressure measurements and flow visualization. A modest modification of the physical model could already take this phenomenon into account. The key idea is that the non-linear effect is essential for the transfer of sound from the source towards the listener, but can be ignored in a model of the generation of the pipe oscillations.
 

Note(s)

Article paru dans : JASA: Journal of the Acoustical Society of America vol. 99 n°3
 

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Date de la notice

2010-02-25 01:00:00
 

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