ellip This function generates an elliptic or Cauer filter with rp dB of passband ripple and rs dB of stopband attenuation. [a, b] = ellip (n, rp, rs, wp) [a, b] = ellip (n, rp, rs, wp, "high") [a, b] = ellip (n, rp, rs, [wl, wh]) [a, b] = ellip (n, rp, rs, [wl, wh], "stop") [a, b, c] = ellip (…) [a, b, c, d] = ellip (…) […] = ellip (…, "s") n: positive integer value rp: non negative scalar value rs: non negative scalar value w: scalar or vector, all elements should be in the range [0,1] This is an Octave function. This function generates an elliptic or Cauer filter with rp dB of passband ripple and rs dB of stopband attenuation. [b, a] = ellip(n, Rp, Rs, Wp) indicates low pass filter with order n, Rp decibels of ripple in the passband and a stopband Rs decibels down and cutoff of pi*Wp radians. If the fifth argument is high, then the filter is a high pass filter. [b, a] = ellip(n, Rp, Rs, [Wl, Wh]) indictaes band pass filter with band pass edges pi*Wl and pi*Wh. If the fifth argument is stop, the filter is a band reject filter. [z, p, g] = ellip(...) returns filter as zero-pole-gain. [...] = ellip(...,’s’) returns a Laplace space filter, w can be larger than 1. [a, b, c, d] = ellip(...) returns state-space matrices.