ellipap Designs a lowpass analog elliptic filter. [z, p, g] = ellipap (n, Rp, Rs) [z, p] = ellipap (n, Rp, Rs) z = ellipap (n, Rp, Rs) n: Filter Order Rp: Peak-to-peak passband ripple Rs: Stopband attenuation This is an Octave function. It designs a lowpass analog elliptic filter of nth order, with a Peak-to-peak passband ripple of Rp and a stopband attenuation of Rs.