%0 Conference Paper %B the 125th Audio Engineering Society Convention %D 2008 %T On the Minimum-phase Nature of Head-Related Transfer Functions %A Juhan Nam %A Miriam Kolar %A Jonathan Abel %C San Francisco, CA, USA %I AES %K binaural sound %K HRTF %K minimum-phase system %U http://www.aes.org/e-lib/browse.cfm?elib=14698 %X  For binaural synthesis, head-related transfer functions (HRTFs) are commonly implemented as pure delays followed by minimum-phase systems. Here, the minimum-phase nature of HRTFs is studied. The cross-coherence between minimum-phase and unprocessed measured HRTFs was seen to be greater than 0.9 for a vast majority of the HRTFs, and was rarely below 0.8. Non-minimum-phase filter components resulting in reduced cross-coherence appeared in frontal and ipsilateral directions. The excess group delay indicates that these non-minimum-phase components are associated with regions of moderate HRTF energy. Other regions of excess phase correspond to high-frequency spectral nulls, and have little effect on cross-coherence.  %Z   %8 10/2008