dfilt.dffirt

Discrete-time, direct-form FIR transposed filter

Syntax

Hd = dfilt.dffirt(b)
Hd = dfilt.dffirt

Description

Hd = dfilt.dffirt(b) returns a discrete-time, direct-form FIR transposed filter, Hd, with numerator coefficients b.

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

The resulting filter states column vector is

(z(1)z(2))

Examples

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

b = firpm(30,[0 .1 .2 .5]*2,[1 1 0 0]);
Hd = dfilt.dffirt(b)
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