Design of two-channel linear phase orthogonal cyclic filterbanks

We propose a method to design an orthonormal two-channel cyclic filterbank (CFB) with real analysis and synthesis filters having linear phase. This is particularly significant, since it is not possible to realize regular two-channel linear phase orthogonal filterbanks (unless the filters are two-tap...

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Bibliographic Details
Published inIEEE signal processing letters Vol. 5; no. 5; pp. 121 - 123
Main Authors Motwani, R., Ramakrishnan, K.R.
Format Journal Article
LanguageEnglish
Published IEEE 01.05.1998
Subjects
Cepstrum
Constraint optimization
Design methodology
Design optimization
Eigenvalues and eigenfunctions
Nonlinear filters
Passband
Symmetric matrices
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Summary:We propose a method to design an orthonormal two-channel cyclic filterbank (CFB) with real analysis and synthesis filters having linear phase. This is particularly significant, since it is not possible to realize regular two-channel linear phase orthogonal filterbanks (unless the filters are two-tap). The lowpass filter of the FB is obtained as a spectral factor of a zero phase Nyquist(2) filter, which is optimized. We show that the CFB design is computationally less demanding as compared to the noncyclic case, and it may be possible to get better filters. We design the CFB for a particular case and show that this filterbank is not a noncyclic orthogonal filterbank.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1070-9908
1558-2361
DOI:10.1109/97.668950