tf2sos {gsignal}

Transfer function to second-order sections form

Description

Convert digital filter transfer function data to second-order section form.

Usage

tf2sos(b, a)

Arguments

b

moving average (MA) polynomial coefficients

a

autoregressive (AR) polynomial coefficients

Value

A list with the following list elements:

sos

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.

g

Overall gain factor that effectively scales the output b vector (or any one of the input Bi vectors).

Author(s)

Julius O. Smith III, [e-mail].
Conversion to R by Geert van Boxtel, [e-mail].

See Also

See also filter

Examples

b <- c(1, 0, 0, 0, 0, 1)
a <- c(1, 0, 0, 0, 0, .9)
sosg <- tf2sos (b, a)