Associate Professor Chalmers University of Technology Gothenburg, Vastra Gotaland, Sweden
Abstract: This paper presents a perceptual evaluation of numerical dispersion in free-field dynamic binaural auralizations of finite-difference time-domain (FDTD) simulations. FDTD-simulated binaural signals are compared perceptually to dispersion error-free binaural signals in a listening experiment. This work aims at identifying the size and density of the receiver array minimizing the audibility of numerical dispersion in the generated binaural signals. The listening experiment results show that the overall reconstruction error does not correlate with the discrimination rates of the subjects. The results also show that increasing the receiver density for a fixed array size does not necessarily render numerical dispersion inaudible in the auralizations. Five out of 27 volumetric arrays led to FDTD-simulated binaural auralizations indistinguishable from the dispersion error-free binaural auralizations.