Experimental demonstration of the modification of the resonances of a simplified self-sustained wind instrument through modal active control.

Meurisse, Thibaut; Mamou-Mani, Adrien; Benacchio, Simon; Chomette, Baptiste; Finel, Victor; Sharp, David and Causse, Rene (2015). Experimental demonstration of the modification of the resonances of a simplified self-sustained wind instrument through modal active control. Acta Acustica united with Acustica, 101(3) pp. 581–593.

Abstract

This paper reports the experimental results of modifying the resonances of wind instruments using modal active control. Resonances of a simplified bass clarinet without holes (a cylindrical tube coupled to a bass clarinet mouthpiece including a reed) are adjusted either in frequency or in damping in order to modify its playing properties (pitch, strength of the harmonics of the sound, transient behaviour). This is achieved using a control setup consisting of a co-located loudspeaker and microphone linked to a computer with data acquisition capabilities. Software on the computer implements an observer (which contains a model of the system) and a controller. Measuring and adjusting the transfer function between the speaker and microphone of the control setup enables modifications of the input impedance and the radiated sound of the instrument.

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