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Communication Dans Un Congrès Année : 2020

The effect of the tonehole lattice cutoff frequency on sound production for conical resonators

Résumé

<latex>The effect of the tonehole lattice cutoff frequency of a conical resonator on sound production is explored using numerical synthesis: time-domain integration, as well as harmonic balance method combined with continuation (MANLAB). The tonehole lattice cutoff frequency f_\textrmc separates the passive response of the resonator into two bands. Below f_\textrmc, an acoustical wave traveling down the main branch of the duct, upon arrival at the first open tonehole, either radiates into the surrounding field, or reflect back into the main bore of the instrument. However, above f_\textrmc, the wave is no longer evanescent and is able to propagate farther into the lattice. In this work, three resonators are designed to have drastically different cutoff frequency behavior: two resonators with cutoff frequencies at 700 and 900 Hz and a simple cone with no tonehole lattice are proposed to compare the effect of the cutoff frequency on sound production. Numerical synthesis shows that some sound production features are almost unaffected by cutoff behavior, such as oscillation thresholds and values of the control parameters leading to the production of certain registers. However, the spectral centroid, an indicator of tonal brightness, seems greatly influenced by the cutoff frequency behavior. The severity of the cutoff, which relates to the overall height reduction of impedance peaks above the cutoff frequency, has a greater impact on the spectral content of the produced sound that the frequency at which cutoff occurs. Thus, taking into account the cutoff frequency behavior in the development of an instrument can be a way to control its spectral features without affecting the main sound production characteristics.</latex>
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Dates et versions

hal-03234048 , version 1 (26-05-2021)

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Tom Colinot, Erik Petersen, Philippe Guillemain. The effect of the tonehole lattice cutoff frequency on sound production for conical resonators. Forum Acusticum, Dec 2020, Lyon, France. pp.3181-3184, ⟨10.48465/fa.2020.0055⟩. ⟨hal-03234048⟩
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