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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