Signal Processing Toolbox

dfilt.dffir

Discrete-time, direct-form, FIR filter

Syntax

• Hd = dfilt.dffir(b)
  Hd = dfilt.dffir
  

Description

Hd = dfilt.dffir(b) returns a discrete-time, direct-form finite impulse response (FIR) filter, Hd, with numerator coefficients, b.

Hd = dfilt.dffir returns a default, discrete-time, direct-form FIR filter, Hd, with b=1. This filter passes the input through to the output unchanged.

The resulting filter states column vector is

Examples

Create a direct-form FIR discrete-time filter with coefficients from a 30^th order lowpass equiripple design:

• b = firpm(30,[0 .1 .2 .5]*2,[1 1 0 0]);
  Hd = dfilt.dffir(b)
  Hd =
           FilterStructure: 'Direct-Form FIR'
                 Numerator: [1x31 double]
          PersistentMemory: false
  

See Also

dfilt, dfilt.dfasymfir, dfilt.dffirt, dfilt.dfsymfir

dfilt.dfasymfir

dfilt.dffirt

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