gsignal (version 0.3-7)

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)

Value

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

Arguments

n

Order of the filter.

Rp

dB of pass-band ripple.

Author

Carne Draug, .
Conversion to R by Geert van Boxtel, .

Details

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

Examples

## 9th order Chebyshev type I low-pass analog filter
zp <- cheb1ap(9, .1)
w <- seq(0, 4, length.out = 128)
freqs(zp, w)