Experimental Demonstration of the Modification of the Resonances of a Simplified Self-Sustained Wind Instrument Through Modal Active Control
Résumé
This paper reports the experimental results of modifying the resonances of wind instruments using modal active control. Resonances of asimplified bass clarinet without holes (a cylindrical tube coupled to abass clarinet mouthpiece including areed)are adjusted either in frequencyorindamping in order to modify its playing properties (pitch, strength of the harmonics of the sound, transient behaviour). This is achievedusing acontrol setup consisting of ac o-located loudspeaker and microphone linked to ac omputer with data acquisition capabilities. Software on the computer implements an observer (which contains am odel of the system)a nd ac ontroller. 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.