sos2tf {gsignal}

Sos to transfer function

Description

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

Usage

sos2tf(sos, g = 1)

Arguments

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). Default: 1.

Value

An object of class "Arma" with the following list elements:

b

moving average (MA) polynomial coefficients

a

autoregressive (AR) polynomial coefficients

Author(s)

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

See Also

as.Arma, filter

Examples

sos <- rbind(c(1, 1, 1, 1, 0, -1), c(-2, 3, 1, 1, 10, 1))
ba <- sos2tf(sos)