Impulse invariance method for A/D filter conversion
Convert analog filter with coefficients b and a to digital, conserving impulse response.
impinvar(b, ...) ## S3 method for class 'Arma' impinvar(b, ...) ## Default S3 method: impinvar(b, a, fs = 1, tol = 1e-04, ...)
b |
coefficients of numerator polynomial |
... |
additional arguments (not used) |
a |
coefficients of denominator polynomial |
fs |
sampling frequency (Default: 1 Hz) |
tol |
tolerance. Default: 0.0001 |
Because impinvar is generic, it can also accept input of class
Arma.
A list of class Arma containing numerator and
denominator polynomial filter coefficients of the A/D converted filter.
Tony Richardson, arichard@stark.cc.oh.us,
Ben Abbott, bpabbott@mac.com,
adapted by John W. Eaton.
Conversion to R by Geert van Boxtel, G.J.M.vanBoxtel@gmail.com
f <- 2 fs <- 10 but <- butter(6, 2 * pi * f, 'low', 's') zbut <- impinvar(but, fs) freqz(zbut, n = 1024, fs = fs)
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