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Vibrato Extraction and Parameterization in the Spectral Modeling Synthesis framework

Title Vibrato Extraction and Parameterization in the Spectral Modeling Synthesis framework
Publication Type Conference Paper
Year of Publication 1998
Conference Name Digital Audio Effects 1998
Authors Herrera, P. , & Bonada J.
Conference Start Date 19/11/1998
Conference Location Barcelona
Abstract Periodic or quasi-periodic low-frequency components (i.e. vibrato and tremolo) are present in steady-state portions of sustained instrumental sounds. If we are interested both in studying its expressive meaning, or in building a hierarchical multi-level representation of sound in order to manipulate it and transform it with musical purposes those components should be isolated and separated from the amplitude and frequency envelopes. Within the SMS analysis framework it is now feasible to extract high level time-evolving attributes starting from basic analysis data. In the case of frequency envelopes we can apply STFTs to them, then check if there is a prominent peak in the vibrato/tremolo range and, if it is true, we can smooth it away in the frequency domain; finally, we can apply an IFFT to each frame in order to re-construct an envelope that has been cleaned of those quasi-periodic low-frequency components. Two important problems nevertheless have to be tackled, and ways of overcoming them will be discussed in this paper first, the periodicity of vibrato and tremolo, that is quite exact only when the performers are professional musicians; second the interactions between formants and fundamental frequency trajectories, that blur the real tremolo component and difficult its analysis.
preprint/postprint document