cheb2ap function

Chebyshev Type II filter prototype

Return the poles and gain of an analog Chebyshev Type II lowpass filter prototype.

cheb2ap(n, Rs)

Arguments

• n: Order of the filter.
• Rs: dB of stop-band ripple.

Returns

list of class Zpg containing poles and gain of the filter

Details

This function exists for compatibility with 'Matlab' and 'Octave' only, and is equivalent to cheby2(n, Rp, 1, "low", "s").

Examples

## 9th order Chebyshev type II low-pass analog filter
zp <- cheb2ap(9, 30)
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 .