Signal Processing Toolbox

latc2tf

Convert lattice filter parameters to transfer function form

Syntax

• [num,den] = latc2tf(k,v)
  [num,den] = latc2tf(k,'iiroption')
  num = latc2tf(k,'firoption')
  num = latc2tf(k)
  

Description

[num,den] = latc2tf(k,v) finds the transfer function numerator num and denominator den from the IIR lattice coefficients k and ladder coefficients v.

[num,den] = latc2tf(k,'iiroption') produces an IIR filter transfer function according to the value of the string 'iiroption':

• 'allpole': Produces an all-pole filter transfer function from the associated all-pole IIR lattice filter coefficients k.
• 'allpass': Produces an allpass filter transfer function from the associated allpass IIR lattice filter coefficients k.

num = latc2tf(k,'firoption') produces an FIR filter according to the value of the string 'firoption':

• 'min': Produces a minimum-phase FIR filter numerator from the associated minimum-phase FIR lattice filter coefficients k.
• 'max': Produces a maximum-phase FIR filter numerator from the associated maximum-phase FIR lattice filter coefficients k.
• 'FIR': Produces a general FIR filter numerator from the lattice filter coefficients k (default, if you leave off the string altogether).

See Also

latcfilt, tf2latc

lar2rc

latcfilt

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