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Sabine Meunier 1 Sophie Savel 2 Jacques Chatron 2 Guy Rabau 1
2 Sons
LMA - Laboratoire de Mécanique et d'Acoustique [Marseille] : UPR7051
Abstract : Most investigations on the variations of loudness with the spatial position of a sound source have been made for static sounds. The purpose of this work was to study the loudness of a moving source. By analogy with studies on difference in loudness between sounds increasing or decreasing in intensity (without movement of the source), we studied the global loudness of a moving sound. The analogy with the sounds whose intensity varies is direct because the at-ear level depends on the position of the source, so a moving sound will create levels that vary over time at the entrance of the auditory canal. We measured the overall loudness of a moving source as a function of the starting and ending positions of the stimulus and of its direction of rotation. Overall, we did not find any overall loudness difference according to the direction of variation of the source. Moreover, the results obtained with a static sound seem to confirm, with absolute magnitude estimation, the amount of directional loudness sensitivity measured previously with an adaptive method. In free field, loudness depends on the position of the sound source (Sivonen and Ellermeier, 2006). In order to quantify the effect of the incidence angle on loudness, the directional loudness sensitivity (DLS) is measured. DSL is defined as the level difference required for equal loudness between a frontal reference sound (azimuth 0°, elevation 0°) and a test sound at a given position. A negative DLS means that the test sound has been perceived softer than the frontal sound and vice versa. In a previous study, we showed a decrease in DLS with an increase in azimuth of an amount of more than 10 dB on average (25 listeners, Meunier et al., 2016). Different studies have also examined the loudness of sounds that increase and sounds that decrease in level. For sounds that only differ in temporal envelop, it has been shown that the global loudness of a sound whose level increases is greater than the global loudness of a sound whose level decreases (Ponsot et al., 2015a, 2015b). This phenomenon has been called asymmetry in loudness. When a sound source is moving around a listener, the at-ear level of the sound varies. Moreover, if we refer to the studies on directional loudness, its loudness should also vary. The aim of the work presented here was to explore how global loudness of moving sounds is formed and the main point was to determine whether there is an asymmetry between sounds that move in opposite directions as their level and loudness also vary in opposite directions.
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Submitted on : Wednesday, October 23, 2019 - 1:56:22 PM
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  • HAL Id : hal-02329017, version 1


Sabine Meunier, Sophie Savel, Jacques Chatron, Guy Rabau. BINAURAL LOUDNESS OF MOVING SOURCES IN FREE FIELD: PERCEPTUAL MEASUREMENTS VERSUS AT-EAR LEVELS. 34th Annual Meeting of the International Society for Psychophysics, International Society for Psychophysics, Aug 2018, Lüneburg, Germany. ⟨hal-02329017⟩



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