Butterworth filter prototype
Return the poles and gain of an analog Butterworth lowpass filter prototype.
buttap(n)
n |
Order of the filter. |
This function exists for compatibility with 'Matlab' and 'Octave' only, and
is equivalent to butter(n, 1, "low", "s").
List of class Zpg containing poles and gain of the
filter.
Carne Draug, carandraug+dev@gmail.com.
Conversion to R by Geert van Boxtel, G.J.M.vanBoxtel@gmail.com.
## 9th order Butterworth low-pass analog filter zp <- buttap(9) w <- seq(0, 4, length.out = 128) freqs(zp, w)
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