Figure 2.

Voss and Allen (1994) subject #7; example pole-zero fit for a normal ear. (a) Poles and zeros of Γ(s), (b) poles and zeros of Z(s). The fit was performed over 0.1 to 10 kHz, yielding 18 poles and 18 zeros with an RMS relative error of 2.5% (MSE = −31.9 dB). Pink poles and zeros are actually located in the positive real s-plane, but have been inverted over the jω axis so that pole-zero locations may be more easily viewed using a log ℜ[s] axis.