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Downsampling versus folding in the DCT domain

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2 Author(s)
Prost, R. ; Inst. Nat. de la Sante et de la Recherche Med., Lyon, France ; Diab, C.

Signals can be split into subbands using ideal bandpass filters in the discrete cosine transform (DCT) domain. We show that decimation by band folding is not equivalent to downsampling but results in two convolution operations that involve both the odd and even samples of the signal

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Signal Processing, IEEE Transactions on  (Volume:44 ,  Issue: 11 )