Filter Design Toolbox™

dfilt.calatticepc - Coupled-allpass, power-complementary lattice filter

Syntax

hd = dfilt.calatticepc(k1,k2) hd = dfilt.calatticepc

Description

hd = dfilt.calatticepc(k1,k2) returns a discrete-time, coupled-allpass, lattice filter object hd, with power-complementary output. This object is two allpass lattice filter structures coupled together to produce complementary output. The lattice coefficients for each structure are vectors, k1 and k2, respectively. beta is shown in the following diagram.

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

Example

Specify a third-order lattice coupled-allpass power complementary filter structure for a filter hd with the following code. You see from the returned properties that Allpass1 and Allpass2 contain vectors of coefficients for the constituent filters.

k1 = [0.9511 + 0.3088i; 0.7511 + 0.1158i]
k2 = 0.7502 - 0.1218i
beta = 0.1385 + 0.9904i
hd = dfilt.calatticepc(k1,k2,beta)
k1 =

   0.9511 + 0.3088i
   0.7511 + 0.1158i


k2 =

   0.7502 - 0.1218i


beta =

   0.1385 + 0.9904i

 
hd =
 
         FilterStructure: 'Coupled-Allpass Lattice, Power 
Complementary Output'
                Allpass1: [2x1 double]
                Allpass2: 0.7502- 0.1218i
                    Beta: 0.1385+ 0.9904i
        PersistentMemory: false
                  States: [3x1 double]

To see the coefficients for Allpass1, check the property values.

get(hd,'Allpass1')

ans =

   0.9511 + 0.3088i
   0.7511 + 0.1158i

dfilt.calatticepc - Coupled-allpass, power-complementary lattice filter

Syntax

Description

Example

See Also