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Table 4

Features remaining after pre-screening according to criterion . Each row represents equivalent features in the frequency bands stated in Section 3.1, with an entry in the table indicating that a particular feature in a particular band passes the pre-selection criterion. Letters and colors represent the clusters resulting from the procedure described in Section 4.2.2. Cluster colors correspond to Figure 1.

Feature name Bands (cluster) Description
B 0 1 2 3
diff_mean (C) (C) (C) (C) Mean diffuseness
doaEl_mean (B) (B) Mean vertical elevation
niacc_mean (D) (D) Mean normalized inter-aural cross-correlation (IACC)
itd_mean (H) Mean inter-aural time difference (ITD)
sphDI_mean (C) (C) (C) (C) Mean spherical directivity index
sphDIAz_mean (C) (C) (C) (C) Mean horizontal spherical directivity index
sphDIEl_mean (B) Mean vertical spherical directivity index
sphGPRatio_mean (F) Mean spherical gradient/pressure ratio
sphGRatio_mean (F) Mean spherical gradient ratio
sphPRatio_mean (F) Mean spherical pressure ratio

doaAz_var (C) (E) (C) (C) (A) Variance of horizontal direction of arrival (DOA)
doaEl_var (C) (C) (C) (A) Variance of vertical DOA
itd_var (G) Variance of ITD
sphDI_var (A) Variance of spherical directivity index
sphDIAz_var (A) (A) Variance of horizontal spherical directivity index

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