Evaluated HRTF preprocessing methods.
|Trunc||Obtain Nth order SH-HRTF via discrete SFT (Eq. (A.11)).|
|EQ||Apply Trunc, then equalise with HRTF-related filters (HRF)  with frequency-dependent regularisation .|
|Tap||Apply Trunc, then tapering  [Hann window, only for n >= (N − 3) and f > fa] and finally apply EQ.|
|TA||Time-align HRTF via phase correction by ear alignment , then apply Trunc.|
|MagLS||Obtain Nth order SH-HRTF via magnitude least squares as in (, Sect. 4.11.2) with smoothing around the cutoff.|
|MagLS + CC||Same as MagLS and then apply covariance constraint as in (, Sect. 4.11.3).|
|SpSub||Obtain Nth order SH-HRTF via spatial subsampling with Nth order Gauss grids .|
|SpSubMod||Time-align HRTF above fa as in , then apply SpSub and finally apply Tap .|
|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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