gsignal (version 0.3-1)

cheb1ap: Chebyshev Type I filter prototype

Description

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

Usage

cheb1ap(n, Rp)

Arguments

n

Order of the filter.

Rp

dB of pass-band ripple.

Value

List of class Zpg containing the poles and gain of the filter.

Details

This function exists for compatibility with 'Matlab' and 'OCtave' only, and is equivalent to cheby1(n, Rp, 1, "low", "s").

Examples

# NOT RUN {
## 9th order Chebyshev type I low-pass analog filter
zp <- cheb1ap(9, .1)
w <- seq(0, 4, length.out = 128)
freqs(zp, w)

# }