Fig. 2From: Loudness stability of binaural sound with spherical harmonic representation of sparse head-related transfer functionsSparsity error, \(\widetilde {\epsilon }\), for left ear HRTF, computed as in Eq. (11), with different numbers of measurement points and different SH orders: a shows the truncation error, b and c show the aliasing error for a constant number of measurements and for a constant truncation order, respectively, and d shows the total sparsity errorBack to article page