Filter properties for the representation of the transfer function between the gearbox and the far-field linear array. (a) Poles (green ⃘) and zeros (black ×) in the Z-domain, (b) b and (c) a coefficients of the IIR filter along the position axis with the design parameters N_b =32, and for two arbitrarily chosen orders (8th and 16th) and the linear and cubic interpolation schemes.