gsignal (version 0.3-1)

ellipap: Low-pass analog elliptic filter

Description

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

Usage

ellipap(n, Rp, Rs)

Arguments

n

Order of the filter.

Rp

dB of passband ripple.

Rs

dB of stopband ripple.

Value

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

# NOT RUN {
## 9th order elliptic low-pass analog filter
zp <- ellipap(9, .1, 40)
w <- seq(0, 4, length.out = 128)
freqs(zp, w)

# }