Modified DFT filter banks with perfect reconstruction

Tanja Karp, N. J. Fliege

Research output: Contribution to journalArticle

155 Scopus citations

Abstract

In this paper, essential features of the recently introduced modified discrete Fourier transform DFT (MDFT) filter bank are presented. First, it is shown that all analysis and synthesis filters - obtained by appropriate complex modulation of a low-pass prototype filter - are linear phase. This is important for subband image coding applications. Another important property is the structure-inherent alias cancellation: all odd alias spectra are automatically compensated in the synthesis filter bank. Further on, the MDFT filter bank provides perfect reconstruction for the same prototypes as for cosine-modulated filter banks. Thus, the same design methods can be used. Finally, different mappings of the input signal into the subbands are discussed and a comparison to the well-known cosine-modulated filter banks is given.

Original languageEnglish
Pages (from-to)1404-1414
Number of pages11
JournalIEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing
Volume46
Issue number11
DOIs
StatePublished - 1999

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