Perception of Speaker Directivity in Virtual Rooms
* Präsentierender Autor
Zusammenfassung:Sound sources, like a human speaker or musical instruments, radiate with a certain spatial directivity. This directivity contributes to the perception of the sound source and the sound field in rooms, affecting the spatial energy distribution of early reflections and late diffuse reverberation. For convincing acoustics simulation applicable in interactive virtual environments and (mobile) acoustically augmented reality, sound directivity has to be considered. While source directivity appears relevant for early reflections, it is unclear to what extent perceptual effects average out and how spectral and spatial cues interact for source directivity perception for later reflections. Based on the perception of directivity, the acoustics simulation could be simplified.Here we assess to what extent directivity of a human speaker should be simulated regarding early reflections and diffuse reverberation. The computationally efficient hybrid approach to simulate and auralize binaural room impulse responses [Wendt et al., JAES, 62, 11 (2014)], combining an image source model with a feedback delay network, was extended to simulate source directivity. Two psychoacoustic experiments assessed the listeners’ ability to distinguish between different virtual source orientations when the effect of source directivity was approximated by an average source directivity filtering for different higher reflection orders.