Analysis of dead tones of classical guitars
Résumé
The dead tones are phenomena frequently occurring on classical guitars, even on high quality guitars. It is perceived as a tone decaying much faster than its closest neighbors. The present study aims to propose global parameters enabling the identification of singular guitar tones, such as dead tones. It is based on the estimation of energy decay curves (or EDC) of a set of different notes recorded on different guitars. The EDC of tones perceived as "pathological" by guitar makers are found to be significantly larger that the EDC of "normal" tones. The mechanical admittance of the bridge is measured for each studied configuration. It is shown that large values of EDC are associated to a strong coupling between the strings and the soundboard. An analysis of each partial, based on the high resolution method, ESPRIT, enables to study the relationships between the partial decay times with the level of coupling. The analysis is intended to be performed from measurements realizable in the workshop of an instrument maker. The present study is a part of the PAFI project, which aims to develop a set of tools dedicated to instrument makers.
Domaines
Acoustique [physics.class-ph]
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