Investigating continuous adaptation of binaural reproduction to changing listening position
* Presenting author
For virtual and augmented reality using binaural technology it is of interest to reproduce sound scenes based on measurements of real rooms. Furthermore, it has become state of the art to explore a provided scene by walking around. Several methods for interpolation of or extrapolation from measured impulse responses have been proposed in the past to provide a convincing continuous binaural reproduction for position changes. However, there is still a lack of experience regarding the practicability and the perceived quality of the various approaches. Only in rare cases a psychoacoustic evaluation considering interactive listener translation was conducted.In the presented study, a reproduction area of about 1mx3m was created from binaural room impulse response (BRIR) measurements from one loudspeaker to a dummy head at three positions with a distance of 1m in two different rooms. A continuous adaptation of relative source angle, level and direct-to-reverberant energy ratio was applied to achieve a seamless auralization. A listening experiment was conducted to evaluate the continuity of level and timbre as well as sound source stability and plausibility of the resulting virtual auditory scenes. In case of pop music the results were satisfying. The reproduction of noise revealed weaknesses.