On the Minimum-phase Nature of Head-Related Transfer Functions
| Title | On the Minimum-phase Nature of Head-Related Transfer Functions |
| Publication Type | Conference Paper |
| Year of Publication | 2008 |
| Authors | Nam, J., M. Kolar, and J. S. Abel |
| Conference Name | the 125th Audio Engineering Society Convention |
| Date Published | 10/2008 |
| Publisher | AES |
| Conference Location | San Francisco, CA, USA |
| Keywords | binaural sound, HRTF, minimum-phase system |
| Abstract | 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. |
| URL | http://www.aes.org/e-lib/browse.cfm?elib=14698 |
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