ellipap function

Low-pass analog elliptic filter

Return the zeros, poles and gain of an analog elliptic low-pass filter prototype.

ellipap(n, Rp, Rs)

Arguments

• n: Order of the filter.
• Rp: dB of passband ripple.
• Rs: dB of stopband ripple.

Returns

list of class Zpg containing zeros, poles and gain of the filter.

Details

This function exists for compatibility with 'Matlab' and 'OCtave' only, and is equivalent to ellip(n, Rp, Rs, 1, "low", "s").

Examples

## 9th order elliptic low-pass analog filter
zp <- ellipap(9, .1, 40)
w <- seq(0, 4, length.out = 128)
freqs(zp, w)

Author(s)

Carne Draug, carandraug+dev@gmail.com . Conversion to R by Geert van Boxtel, G.J.M.vanBoxtel@gmail.com .