Figure 1.

The right ears of seven subjects together with their associated head-related transfer functions (HRTFs) recorded using a small microphone placed at the opening of the auditory canal (see Pralong and Carlile, 1994; Hammershoi and Moller, 2002). Note that the variations between the transfer functions remain small (<2 dB) up to around 5 kHz however, at higher frequencies, the frequencies of the prominent spectral notches and peaks results in a substantial inter-individual differences.