Filter Design Toolbox

dfilt.calattice

Construct a discrete-time, coupled-allpass, lattice filter object

Syntax

• Hd = dfilt.calattice(k1,k2,beta)
  Hd = dfilt.calattice
  

Description

Hd = dfilt.calattice(k1,k2,beta) returns a discrete-time, coupled-allpass, lattice filter object, Hd, which is two allpass, lattice filter structures coupled together. The lattice coefficients for each structure are vectors, k1 and k2. Input argument beta is shown in the diagram below

Hd = dfilt.calattice returns a default, discrete-time coupled-allpass, lattice filter object, Hd. The default values are k1 = k2 = [ ], which is the default value for dfilt.latticeallpass, and beta = 1. This filter passes the input through to the output unchanged.

Example

Specify a third-order lattice coupled-allpass filter structure for a dfilt filter, Hd with the following code.

• k1 = [0.9511 + 0.3088i; 0.7511 + 0.1158i]
  k2 = 0.7502 - 0.1218i
  beta = 0.1385 + 0.9904i
  Hd = dfilt.calattice(k1,k2,beta)
  k1 =
     0.9511 + 0.3088i
     0.7511 + 0.1158i
  k2 =
     0.7502 - 0.1218i
  beta =
     0.1385 + 0.9904i
  Hd =
       FilterStructure: 'Lattice Coupled Allpass'
             Allpass1: [1x1 dfilt.latticeallpass]
             Allpass2: [1x1 dfilt.latticeallpass]
                 Beta: 0.1385+ 0.9904i
  

See Also

dfilt.calatticepc

dfilt.latticeallpass, dfilt.latticear, dfilt.latticearma, dfilt.latticemamax, dfilt.latticemamin in your Signal Processing Toolbox documentation

denormalmin

dfilt.calatticepc