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Equivalence of Series Combs to TDLs
It is also straightforward to show that a series combination of
feedforward comb filters produces a sparsely tapped delay line as
well. Considering the case of two sections, we have
which yields
Thus, the TDL of Fig. 1.13 is equivalent also to the series
combination of two feedforward comb filters. Note that the
same TDL structure results irrespective of the series ordering of the
component comb filters.
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