| Résumé |
The respective influences of spectral and temporal aspects
of sound in roughness perception are examined by way of
phase manipulations. In a first experiment, the phase of the
central component of three-component signals is shown to
modify perceived roughness, for a given amplitude spectrum,
regardless of whether it modifies the (physical) envelope.
A second experiment shows that the shape of the waveform
envelope, for a given amplitude spectrum and a given
modulation depth, also influences perceived roughness. We
interpret both of these results by considering the envelope
of an internal representation that is deduced from the
physical signal by taking into account peripheral auditory
processing. Our results indicate that the modulation depth
of such an internal representation is not the only
determinant of roughness, but that an effect of temporal
asymmetry is also to be taken into account.
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