Experimental Investigation of Reed Instrument Functioning Through Image Analysis of Reed Opening

Authors: Almeida, André; Vergez, Christophe; Caussé, René

Source: Acta Acustica united with Acustica, Volume 93, Number 4, July/August 2007 , pp. 645-658(14)

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Abstract:

An image analysis procedure was developed to analyse front view video recordings of the motion of a musical instrument's reed. For each image of the movie, this procedure allows to extract various geometrical characteristics of the reed opening such as area, width and length of the two main dimensions. The technique is applied to static measurements on double-reeds throughout the normal range of playing pressures when the reed is inserted into an artificial blowing machine. Measuring the opening area as a function of the applied pressure shows a constant reed stiff ness. Long-term deformations of the reed found in the stiff ness measurement are related to the visco-elasticity of the reed material, and the parameters of relaxation are determined using long-term recordings of the reed opening. Moreover, the reed opening area is found to be proportional to the distance between reed blades, which is confirmed for oscillating regimes.

Document Type: Research article

Publication date: 2007-07-01

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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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Experimental Investigation of Reed Instrument Functioning Through Image Analysis of Reed Opening

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