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Musical signal analysis with chaos
No full textCertain characteristics of musical signals are not fully accounted for by the classical methods of time-frequency analysis. In the signals produced by acoustic instruments, for instance, the nonlinear dynamics of the exciter often causes turbulence during the evolution of the sound, or it may produce nonperiodic noises (such as multiphonics). This chapter investigates the possibility of using analysis methods based on chaos theory to study the relevant properties both of the signal and of its production mechanisms. For a long time science purposely disregarded nonlinear phenomena or restricted their study to the most superficial and intuitive facets. The main cause of this attitude was a lack of analysis methods; as a matter of fact, nonlinear systems generally do not possess closed-form analytic solutions; consequently any study performed with classical techniques turns out to be impossible. Only of late have firm bases have been laid for the foundation of a new experimental science that studies and analyzes deterministic nonlinear systems, which was given the name of chaos theory. Beneath such an exotic name are profoun
Expressiveness in music performance: analysis and modeling
Get PDFExpression is an important aspect of music performance. It is the added value of a performance and is part of the reason that music is interesting to listen to and sounds alive. Moreover, understanding and modeling expressive content communication is important in many engineering applications. In human musical performance, acoustical or perceptual changes in sound are organized in a complex way by the performer in order to communicate musical content to the listener. The same piece of music can be performed trying to convey a specific interpretation of the score, by adding mutable expressive intentions. The analysis of these systematic deviations has led to the formulation of several models that try to describe their structures, and aim at explaining where, how and why a performer modifies, sometime in an unconscious way, what is indicated by the notation of the score. Modeling paradigms and problems are reviewed and issues for future research efforts are discussed
L' apporto delle Facoltà universitarie scientifiche alla ricerca e alla didattica musicale
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