【Title】An individualized interaural time difference model based on spherical harmonic function expansion

【Author】ZHONG Xiaoli~(1,2) XIE Bosun~(1,2) (1 Acoustic Lab.,Physics Dept.,School of Science,South China Univ.of Tech.Guangzhou 510641) (2 State Key Lab.of Subtropical Building Science,South China Univ.of Tech.Guangzhou 510641)

【Abstract】A spatially continuous and individualized interaural time difference(ITD) model is proposed based on spherical harmonic expansion,and the spatial sampling theorem of ITD is derived.Analyses on ITDs from 52 human subjects demonstrate that the proposed ITD model, which is represented as a weighted sum of spherical harmonics up to a degree of 6,is adequate for describing the spatial characteristics of ITD including left-right symmetry and front-back asymmetry.The spatially continuous ITD for a specific subject can be accurately reconstructed from 39 measured ITDs at different spatial directions,or approximately evaluated from four head- and pinna-related anthropometric parameters.The proposed ITD model is superior to the existing ITD models in aspects of model structure and accuracy,and is helpful to simplification of ITD measurement as well as anthropometry-based customization of ITD.