Perfect Reconstruction Cosine Modulated Filter Banks
By changing the phases
, the pseudo-QMF filter bank can yield
perfect reconstruction:
![]() |
(12.101) |
where


If
, then this is the
oddly stacked Princen-Bradley filter bank
and the analysis filters are related by cosine modulations of
the lowpass prototype:
![]() |
(12.102) |
However, the length of the filters


![]() |
(12.103) |
The parameter


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Pseudo-QMF Cosine Modulation Filter Bank