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Analyse-synthèse de sons impulsifs : approches physique et perceptive

Abstract : This PhD thesis concerns the analysis and synthesis of impulsive sounds. The main specificity of this work lies in its pluridisciplinary approach. Notably, this study calls on vibratory mechanics, digital non stationary signal processing and psychoacoustics. To establish efficient synthesis methods, the combination of these complementary approaches have shown to be useful and pertinent. From a physical point of view, an impulsive sound is the result of a freely oscillating resonator excited by an impact. From a perceptual point of view, many psychoacoustic tests have shown that human hearing is able to identify on impulsive sound from its temporal damping (which depends on the characteristic of the material) and from its spectral contents correlated to the pitch (and which indicates the vibrating structure geometry). This work leads to the implementation of efficient synthesis methods using digital waveguide models. They can simulate the vibratory behavior of unidimensional simple structures (like beams) and multidimensional ones (like membranes and thin plates). When it is possible, these models are based on the physical modelling of the structure. The model parameters are estimated from the analysis of natural sounds and from the physical features of the structure. Otherwise, a synthesis model is established in the case of complex multidimensional structures where analytical solutions do not exist. The model's parameters are estimated from the analysis of joint sound representations (like time-scale representations) which is well adapted to the analysis of non stationary signals. Finally, an application of this study concerning the synthesis of piano sounds is described. One of the presented models is used to reproduce the impulse response of the piano soundboard. The models parameters are estimated from the analysis of experimental signals obtained from measurements made on a real piano in an anechoic room. From these measurements, transfer functions of the soundboard and its acoustic radiation are estimated to virtually reproduce the acoustic field at the pianist's head level.
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Contributor : Mitsuko Aramaki <>
Submitted on : Wednesday, March 31, 2004 - 5:52:42 PM
Last modification on : Tuesday, October 20, 2020 - 3:10:31 AM
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  • HAL Id : tel-00005491, version 1


Mitsuko Aramaki. Analyse-synthèse de sons impulsifs : approches physique et perceptive. Acoustique [physics.class-ph]. Université de la Méditerranée - Aix-Marseille II, 2003. Français. ⟨tel-00005491⟩



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