Sonie de champs acoustiques stationnaires en situation d'écoute dichotique

Abstract : Listening in a natural environment implies to consider complex sound fields (several sound sources, different spatial positions, reflections…) and a binaural listening configuration. As a consequence, differences in time, level and spectrum between the two at-ear signals are systematically induced by the direction-dependant physical filtering from the human head, torso and pinnae. Existing loudness models provide accurate predictions under simplified listening situations (ISO-532B (1975), DIN-45631 (1990), ANSI-S3.4 (2007)). These models have been designed to use monaural (only one ear) or diotic (same signal at the two ears) signals, equivalent to one sound source with a frontal incidence, in a free or diffuse field. However, the models fail to predict loudness when the interaural differences are large. The present document focuses on the loudness of stationary sound fields, made up of one or several, artificial or real sound sources, in a free field or in a real environment. New elements have been brought to light regarding how, in a dichotic listening situation, information is combined from the two ears to produce one unique binaural loudness percept (binaural gain, case of several sound sources, effect of interaural correlation,...). On the one hand, one hypothesis have been tested in order to try to explain the interindividual differences observed in binaural loudness summation ; the robustness and stability over time of these individual strategies have been highlighted. On the other hand, predictions from the three main psychophysical models of binaural loudness (ANSI-S3.4 (2007), Moore et Glasberg (2007), Sivonen et Ellermeier (2008)) have been compared with all of the subjective data (involving different levels of realism), which allowed us to define more accurately the domain of validity and performance of these models in highly dichotic listening situations.
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Michaël Vannier. Sonie de champs acoustiques stationnaires en situation d'écoute dichotique. Acoustique [physics.class-ph]. INSA de Lyon, 2015. Français. ⟨NNT : 2015ISAL0040⟩. ⟨tel-01277638v2⟩

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