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L'effet de la fréquence fondamentale sur le timbre

Abstract : This dissertation examines the effect of the fundamental frequency (Fo) on the timbre of a musical instrument. Seven experiments are reported, that were run with natural or synthetic sounds.
In these experiments, subjects were asked to judge timbre dissimilarities between two stimuli while ignoring their possible pitch difference. Experiments I, II and III used stimuli from natural instruments of the occidental orchestra. The other four experiments used stimuli synthesized by pure tones addition.
Experiment I presented pairs of stimuli with the same Fo. Experiment II presented them with a constant difference in \fo. Experiment III varied in the same session these Fo differences (dFo). Experiment IV used synthetic stimuli changing only by their temporal envelope and using the same dFo as in experiment III. Experiment V used stimuli changing only by their spectral centroid and using the same dFo as in experiments III and IV. Experiment VI used also stimuli changing only by their spectral centroid, but with a wider set of dFo. Finally, experiment VII used stimuli changing only by their spectral spread and using the same dFo as in experiment VI.
The results show that subjects are able to judge a timbre dissimilarity between two stimuli with a large Fo difference. However, a certain quantity, proportional to the dFo and small compared to the timbre difference, is added to dissimilarity judgments, having for consequence the appearance of a dimension predicted by Fo.
As a first approximation, the fundamental frequency has no effect on the timbre of musical instruments. In a second approximation, small effects are observed, but they are weak compared to the differences between instruments. These variations can be predicted from a specific analysis of the signal.
No significant effect of Fo was found on the timbre dimension predicted by the impulsiveness. This dimension can be considered as independent of Fo.
The timbre dimension, predicted by the spectral centroid, shifts itself with the Fo. Its descriptor has been corrected to integrate this effect.
A small and significant effect of Fo has been found on the timbre dimension predicted by the spectral spread.
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Contributor : Jeremy Marozeau <>
Submitted on : Friday, August 17, 2001 - 2:36:49 AM
Last modification on : Monday, December 14, 2020 - 9:55:42 AM
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  • HAL Id : tel-00008742, version 1

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Jeremy Marozeau. L'effet de la fréquence fondamentale sur le timbre. Autre. Université Pierre et Marie Curie - Paris VI, 2004. Français. ⟨tel-00008742⟩

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