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# dfilt.latticear

Discrete-time, lattice, autoregressive filter

## Syntax

Hd = dfilt.latticear(k)
Hd = dfilt.latticear

## Description

Hd = dfilt.latticear(k) returns a discrete-time, lattice autoregressive filter, Hd, with lattice coefficients, k.

Hd = dfilt.latticear returns a default, discrete-time, lattice autoregressive filter, Hd, with k=[ ]. This filter passes the input through to the output unchanged.

The resulting filter states column vector is

$\left[\begin{array}{c}z\left(1\right)\\ z\left(2\right)\\ z\left(3\right)\end{array}\right]$

## Examples

Form a third-order lattice autoregressive filter structure for a dfilt object, Hd, using the following lattice coefficients:

```k = [.66 .7 .44];
Hd = dfilt.latticear(k)
```