Log-magnitude modelling of auditory tuning curves

In this paper, we propose the novel application of a technique for filter design that can accurately fit measured tuning curves for the auditory fibres in the log-magnitude domain. This method provides pole-zero filters with guaranteed stability, and its logmagnitude domain criterion allows tuning curves with very steep slopes to be accurately modelled with an 8 to 10 order polezero filter. Thus, this technique can also be used to design a new set of critical band filters with superior frequency domain characteristics compared with the well-known gammatone filter bank. The filter bank designed using this technique has applications in auditory-based speech and audio analysis.