gsignal (version 0.3-1)

cheb2ap: Chebyshev Type II filter prototype

Description

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

Usage

cheb2ap(n, Rs)

Arguments

n

Order of the filter.

Rs

dB of stop-band ripple.

Value

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

# NOT RUN {
## 9th order Chebyshev type II low-pass analog filter
zp <- cheb2ap(9, 30)
w <- seq(0, 4, length.out = 128)
freqs(zp, w)

# }