tf2zp function

Transfer function to zero-pole-gain form

Convert digital filter transfer function parameters to zero-pole-gain form.

tf2zp(b, a)

Arguments

• b: moving average (MA) polynomial coefficients, specified as a numeric vector or matrix. In case of a matrix, then each row corresponds to an output of the system. The number of columns of b must be less than or equal to the length of a.
• a: autoregressive (AR) polynomial coefficients, specified as a vector.

Returns

A list of class Zpg with the following list elements:

• z: complex vector of the zeros of the model (roots of B(z))
• p: complex vector of the poles of the model (roots of A(z))
• g: overall gain (B(Inf))

Examples

b <- c(2, 3)
a <- c(1, 1/sqrt(2), 1/4)
zpk <- tf2zp(b, a)

See Also

filter

Author(s)

Geert van Boxtel, gjmvanboxtel@gmail.com