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On the Minimum-Phase Nature of Head-Related Transfer Functions

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.

Authors: Nam, Juhan; Kolar, Miriam A.; Abel, Jonathan S.
Affiliation: CCRMA, Stanford University
AES Convention:125 (October 2008) Paper Number:7546 Import into BibTeX
Subject:Room Acoustics and Binaural Audio

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