tf2latc

Convert transfer function filter coefficients to lattice filter form

Syntax

[k,v] = tf2latc(b,a)

[k,v] = tf2latc(b0,a)

k = tf2latc(1,a)

k = tf2latc(b)

k = tf2latc(b,phase)

Description

[k,v] = tf2latc(b,a) returns the lattice coefficients k and the ladder coefficients v for an IIR (ARMA) lattice-ladder filter, normalized by a(1). The function errors if one or more of the lattice coefficients are exactly equal to 1.

[k,v] = tf2latc(b0,a) returns the ladder coefficients where only the first element in v is nonzero. b0 is a scalar.

k = tf2latc(1,a) returns the lattice coefficients k for an IIR all-pole (AR) lattice filter.

k = tf2latc(b) returns the lattice coefficients k for an FIR (MA) lattice filter, normalized by b(1).

k = tf2latc(b,phase) specifies the type of FIR (MA) lattice filter as minimum-phase or maximum-phase.

Examples

Convert All-Pole IIR Filter to Lattice Coefficients

Convert an all-pole IIR filter to lattice coefficients.

a = [1 13/24 5/8 1/3];
k = tf2latc(1,a)

k = 3×1

    0.2500
    0.5000
    0.3333

Input Arguments

b, a — Transfer function coefficients

vectors

Transfer function coefficients, specified as vectors.

Data Types: single | double

b0 — Transfer function numerator coefficients

scalar

Transfer function numerator coefficients, specified as a scalar.

Data Types: single | double

phase — Type of FIR (MA) filter

"max" | "min"

Type of FIR (MA) filter, specified as either "max" or "min". For a maximum-phase filter, specify phase as "max". For a minimum-phase filter, specify phase as "min".

Data Types: char | string

Output Arguments

k — Lattice coefficients

vector

Lattice coefficients, returned as a vector.

v — Ladder coefficients

vector

Ladder coefficients, returned as a vector.

Version History

Introduced before R2006a