Figure 3.
Effects of spectral smoothing methods on an example HRTF at 60° azimuth. Top row: monaural spectrum at the ipsilateral ear. Bottom row: difference between the left- and right-ear spectra (or the ILD). Spectral representations were obtained by filtering the impulse response with a gammatone filter bank (Lyon, 1997) and calculating the root mean square amplitude within each band. Left column: smoothing according to Hassager et al. (2016) where B is the spectral smoothing bandwidth relative to one ERBN (Glasberg & Moore, 1990). Right column: smoothing according to Baumgartner et al. (2017) where C is a scaling factor that is applied to spectral magnitudes. Gray-shaded areas indicate frequency ranges not tested in the respective experiments. The HRTF is from subject S01 in Baumgartner et al. (2017).
ILD = interaural level difference.