Masking effects in vertical whole body vibrations
Résumé
The existence of masking effects for vertical vibrations of seated subjects was investigated. In a first experiment, detection thresholds of sinusoids at six different frequencies (between 30 and 80 Hz) were estimated using a 3-AFC with a three-down one-up rule. Then, thresholds were estimated in the presence of a vibratory masking stimulus: a band pass noise (10 to 20 Hz) at three different levels (between 0.1 and 0.315 m/s2). The presence of this band-pass noise increased the threshold of all studied frequencies. At detection, the overall level of the signal (masker noise plus sinusoid) was greater than the level of the masker noise alone by a value close to the just noticeable differences in level for this noise. Results suggested that the detection was related to a global energy level discrimination process. Finally, some indicators explaining this phenomenon are presented.
Domaines
Acoustique [physics.class-ph]Origine | Fichiers éditeurs autorisés sur une archive ouverte |
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