N-Channel Polyphase Decomposition
For the general case of arbitrary
, the basic idea is to decompose
into its periodically interleaved subsequences, as indicated
schematically in Fig.11.9. The polyphase decomposition into
channels is given by
where the subphase filters are defined by
![]() |
(12.12) |
with
![]() |
(12.13) |
The signal




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Type II Polyphase Decomposition
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Two-Channel Case