Transfer function to second-order sections form
Convert digital filter transfer function data to second-order section form.
tf2sos(b, a)
b |
moving average (MA) polynomial coefficients |
a |
autoregressive (AR) polynomial coefficients |
A list with the following list elements:
Second-order section representation, specified as an nrow-by-6
matrix, whose rows contain the numerator and denominator coefficients of
the second-order sections:sos <- rbind(cbind(B1, A1), cbind(...),
cbind(Bn, An)), where B1 <- c(b0, b1, b2), and A1 <- c(a0,
a1, a2) for section 1, etc. The b0 entry must be nonzero for each
section.
Overall gain factor that effectively scales the output b
vector (or any one of the input Bi vectors).
Julius O. Smith III, jos@ccrma.stanford.edu.
Conversion to R by Geert van Boxtel, gjmvanboxtel@gmail.com.
See also filter
b <- c(1, 0, 0, 0, 0, 1) a <- c(1, 0, 0, 0, 0, .9) sosg <- tf2sos (b, a)
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