Reflection Properties Influencing the Precedence Effect
* Presenting author
The precedence effect refers to a perceptual phenomenon whereby the direct sound dominates the perception. This allows us to localize sound sources in challenging reverberant environments in which the direct sound is followed by multiple reflections. Measurements on the precedence effect have traditionally been made by presenting two similar sound instances, one representing the direct sound and the other simulating a specular reflection. If sound is reflected from a spatially structured surface, energy is scattered away from the specular reflection direction yielding a spatial and temporal widening of the reflection. This spatio-temporal smearing is characterized by the scattering coefficient, defined as the ratio of the non-specularly reflected energy to the total energy reflected by the surface.Our contribution presents a listening experiment which studies the influence of reflection properties on the precedence effect. Different levels of the scattering coefficient are simulated with the scattered energy assumed to be distributed according to Lambert’s cosine law. The auralization of direct sound and reflection employs a loudspeaker ring and the experiment evaluates the impact of spatial and temporal spread on measures of the precedence effect.