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Characterization of open woodwind toneholes by the tube reversed method

  • Garcia Mayen, Hector
  • Kergomard, Jean
  • Vergez, Christophe
  • Guillemain, Philippe
  • Jousserand, Michael
  • Pachebat, Marc
  • Sanchez, Patrick
Publication Date
May 19, 2021
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Woodwind tonehole’s linear behavior is characterized by two complex quantities: the series and shunt acoustic impedances. A method to determine experimentally these two quantities is presented. It is based on two input impedance measurements. The method can be applied to clarinet-like instruments.The robustness of the method proposed is explored numerically through the simulation of the experiment when considering geometrical and measurement uncertainties. Experimental results confirm the relevance of the method proposed to estimate the shunt impedance. Even the effect of small changes in the hole's geometry, such as those induced by undercutting, are characterized experimentally. The main effect of undercutting is shown to be a decrease of the tonehole’s acoustic mass, in agreement with theoretical considerations based on the shape of the tonehole. Experimental results also reveal that losses in toneholes are significantly higher than those predicted by the theory. Therefore the method is suitable for the experimental determination of the shunt impedance, but it is not convenient for the characterization of the series impedance.

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