Consider an arbitrary digital filter with transfer function
(a) Perform a two-component polyphase decomposition of H(z) by grouping the even-numbered samples and the odd-numbered samples Thus show that H (z) can be expressed as
and determine
(b) Generalize the result in part (a) by showing that H(z) can be decomposed into a D-component polyphase filter structure with transfer function
Determine
(c) For the IIR filter with transfer function
determine for the two-component decomposition.
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