On the variations of inter-aural time differences (ITDs) with frequency
نویسنده
چکیده
Inter-aural time differences (ITDs) constitute an important localization cue for azimuth estimation, particularly below 1.5 kHz. As a first approximation, it is commonly assumed that ITDs do not depend on frequency. Nevertheless, Kuhn (JASA, 1977) shows theoretically and experimentally that due to diffraction effects around the head, ITDs depend on frequency. Low frequency ITDs should thus theoretically be 1.5 times greater than high frequency ones. To study this point, different classical tools are adapted to compute the ITD variations with frequency: onset time differences, maximum of the cross correlation, and phase differences. The reliability of each tool regarding ITD computation is assessed on the basis of head-related transfer functions (HRTFs) coming from a spherical head model. The effective frequency dependence of ITDs is finally shown by analyzing real animal HRTFs.
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