Table 1

Evaluated HRTF preprocessing methods.

Method Implementation notes
Trunc Obtain Nth order SH-HRTF via discrete SFT (Eq. (A.11)).
EQ Apply Trunc, then equalise with HRTF-related filters (HRF) [31] with frequency-dependent regularisation [32].
Tap Apply Trunc, then tapering [35] [Hann window, only for n >= (N − 3) and f > fa] and finally apply EQ.
TA Time-align HRTF via phase correction by ear alignment [16], then apply Trunc.
MagLS Obtain Nth order SH-HRTF via magnitude least squares as in ([4], Sect. 4.11.2) with smoothing around the cutoff.
MagLS + CC Same as MagLS and then apply covariance constraint as in ([4], Sect. 4.11.3).
SpSub Obtain Nth order SH-HRTF via spatial subsampling with Nth order Gauss grids [10].
SpSubMod Time-align HRTF above fa as in [41], then apply SpSub and finally apply Tap [21].
BiMagLS First apply TA to time-align the HRTF and then obtain Nth order SH-HRTF via MagLS with cutoff at 3 kHz.

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