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    Catégorie de document Contribution à un colloque ou à un congrès
    Titre Comparison of the effect of and mistuning on the double decay of piano tones
    Auteur principal Olivier Thomas
    Co-auteurs David Rousseau, René Caussé, Eric Marandas
    Colloque / congrès ISMA: International Symposium of Music Acoustics. Leavenworth : Juin 1998
    Comité de lecture Indéterminé
    Collation p.253-258
    Copyright ISMA/ircam
    Année 1998
    Statut éditorial Publié
    Résumé

    A characteristic of the piano tones is their double decay (the initial sound followed by the "aftersound"), related to the existence of two polarizations. The goal of this study is to understand and to compare more quantitatively than the previous work, the influence of parameters which are under the control of the piano tuners: the mistuning and irregularities in striking action of the hammer. We simulated on a computer the vibration of an unison group of strings, which includes the dominant damping at the bridge as well as the vertical coupling between strings. Excitation irregularities were simulated by varying the initial deplacement and velocities of the strings. The study analyses the ratio of the aftersound to the immediate sound, the compound decay, and the amount of destructive interference. This interference can be seen where the slope of the decay curve changes, and is most pronounced at the bridge, where the strings are dynamically coupled. This comparison leads to the conclusion that if necessary, the piano tuner can to a certain extent correct for a poorly adjusted hammer by modifiying the mistuning. But all hammers properly adjusted are essential for a constant and uniform level for all notes, which is necessary for a very good piano.

    Mots-clés accordeur / piano / cordes / pontmarteau / modélisation de cordes
    Equipe Acoustique instrumentale
    Cote Thomas98a

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