Using inter-positional Transfer Functions in 3D-sound

This paper addresses the interpolation of Head-Related Transfer Functions (HRTFs) for 3D-sound generation through headphones. HRTFs are transfer functions associated with the paths between sound sources and the ears, and are usually measured for a finite set of source locations around the listener. Generation of 3D-sound at any other virtual positions requires interpolation procedures. In this work, the Inter-positional Transfer Function (IPTF) is introduced and an IPTF-based new method for HRTF interpolation is proposed. Comparisons between the IPTF-based and the bilinear interpolation methods are provided, with focus on interpolation accuracy and computational complexity.