Vasileios Chatziioannou

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It has recently been proposed that the effects of structural vibrations on the radiated sound of brass wind instruments may be attributable to axial modes of vibration with mode shapes that contain no radial nodes [Kausel, Chatziioannou, Moore, Gorman, and Rokni, J. Acoust. Soc. Am. 137, 3149-3162 (2015)]. Results of experiments are reported that support(More)
Electronic speckle pattern interferometry is a well-known experimental technique for full-field deformation measurements. Although speckle interferometry techniques were developed years ago and are widely used for the visualization of the operating deflection shapes of vibrating surfaces, methods for accurate reconstruction of the observed deflection shape(More)
Previous work has demonstrated that structural vibrations of brass wind instruments can audibly affect the radiated sound. Furthermore, these broadband effects are not explainable by assuming perfect coincidence of the frequency of elliptical structural modes with air column resonances. In this work a mechanism is proposed that has the potential to explain(More)
Time-domain simulations of wind instruments can, in principle, deal with non-linear oscillations and are also capable of modeling both the steady-state and the transient behavior of a system. The starting transient is usually an important identifying feature of the instrument that is played. Subtle control of articulation is required from skilled musicians(More)
Nonlinear interactions may impose several restrictions to numerical simulation attempts, in particular concerning the design of unconditionally stable algorithms. Such algorithms are required for real-time synthesis applications where virtual instruments may be modified on-line. One characteristic case of nonlinear interactions is that of impact sounds.(More)
Physical-modelling based sound resynthesis is considered by estimating physical model parameters for a clarinet-like system. Having as a starting point the pressure and flow signals in the mouthpiece, a two-stage optimisation routine is employed, in order to estimate a set of physical model parameters that can be used to resynthesise the original sound.(More)
Electronic pickup systems for acoustic instruments are often used in popular and contemporary music performances because they allow amplification and modification of a clean and direct signal. Strain gauge sensors on saxophone and clarinet reeds have been shown to be a useful tool to gain insight into tongue articulation during performance but also capture(More)
Electronic speckle pattern interferometry is performed for temporal analysis of the surface deformation of vibrating structures. This requires specially designed image processing methods in order to reconstruct the dynamic deformation of an object. The reconstruction procedure which is based on a numerical optimization algorithm is applied on a set of(More)