Plucked Guitar Transients: Comparison of Measurements and Synthesis
The predictions of a calibrated synthesis model for the coupled string/body vibration of a guitar are compared with measurements. A reasonably good match is demonstrated at low frequencies, except that some individual decay rates of "string modes" are hard to match correctly. It is shown to be essential to use an accurate damping model for the string: the intrinsic damping of the classical guitar strings used here is found to vary by an order of magnitude in the audible frequency range. At higher frequencies, two phenomena not included in the synthesis model are found to produce disparities between measurement and synthesis. First, the two polarisations of string motion show modal frequencies which are split further apart than can be explained by body coupling. This effect is tentatively attributed to slight rolling on the fret and/or bridge, resulting in different effective lengths for the two polarisations. Second, unexpected extra peaks are seen in the measured spectra, which are frequency-doubled relatives of the expected peaks due to transverse string resonances. The non-linear mechanism creating these additional peaks is presumed to involve excitation of longitudinal string motion by the transverse vibration.
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Document Type: Research Article
Publication date: September 1, 2004
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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