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Level in dB (A) and phase responses (B) of the numerically determined transfer characteristics (light blue, thick lines), (light orange, thick lines), and their IIR-approximates (chain lines) according to the legend exemplarily shown for Belting /aː/ (A♭3). Additionally, the frequency spectrum of the original (green color) and loudness normalized sound data (gray color) are plotted in the upper panel (A).
