Signal Toolkit - ellip

Function File: [b, a] = ellip (n, rp, rs, wp)

Function File: [b, a] = ellip (n, rp, rs, wp, "high")

Function File: [b, a] = ellip (n, rp, rs, [wl, wh])

Function File: [b, a] = ellip (n, rp, rs, [wl, wh], "stop")

Function File: [z, p, g] = ellip (…)

Function File: [a, b, c, d] = ellip (…)

Function File: […] = ellip (…, "s")

Generate an elliptic or Cauer filter with rp dB of passband ripple and rs dB of stopband attenuation.

[b,a] = ellip(n, Rp, Rs, Wp) low pass filter with order n, cutoff pi*Wp radians, Rp decibels of ripple in the passband and a stopband Rs decibels down.

[b,a] = ellip(n, Rp, Rs, Wp, ’high’) high pass filter with cutoff pi*Wp...

[b,a] = ellip(n, Rp, Rs, [Wl, Wh]) band pass filter with band pass edges pi*Wl and pi*Wh ...

[b,a] = ellip(n, Rp, Rs, [Wl, Wh], ’stop’) band reject filter with edges pi*Wl and pi*Wh, ...

[z,p,g] = ellip(...) return filter as zero-pole-gain.

[...] = ellip(...,’s’) return a Laplace space filter, W can be larger than 1.

[a,b,c,d] = ellip(...) return state-space matrices

References:

- Oppenheim, Alan V., Discrete Time Signal Processing, Hardcover, 1999. - Parente Ribeiro, E., Notas de aula da disciplina TE498 - Processamento Digital de Sinais, UFPR, 2001/2002.