ellip Elliptic/Cauer filter design with rp dB of passband ripple and rs dB of stopband attenuation. [b, a] = ellip (n, rp, rs, wp) [b, a] = ellip (n, rp, rs, wp, "high") [b, a] = ellip (n, rp, rs, [wl, wh]) [b, a] = ellip (n, rp, rs, [wl, wh], "stop") [z, p, g] = ellip (…) […] = ellip (…, "s") n: positive integer value (order of filter) rp: non negative scalar value (passband ripple) rs: non negative scalar value (stopband attenuation) ws: scalar or vector of length 2, all elements should be in the range [0,1] 1).Normalised digital passband edge(s) for digital filter, in the range [0, 1] {dimensionless} 2).Analog passband edge(s) for analog filter, in the range [0, Inf] {rad/sec} 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. [b,a] = ellip(n, Rp, Rs, [Wl, Wh], 'stop') band reject filter with edges pi*Wl and pi*Wh [z, p, g] = ellip(...) returns filter as zero-pole-gain. [...] = ellip(...,’s’) returns a Laplace space filter, wp can be larger than 1 rad/sec.