An example of a TDL with two internal taps is shown in
Fig.2.19. The total delay line length is
samples, and the
internal taps are located at delays of
and
samples,
respectively. The output signal is a linear combination of the input
signal
, the delay-line output
, and the two tap
signals
and
.
The difference equation of the TDL in Fig.2.19 is, by inspection,
corresponding to the transfer function