Orthogonal symmetric prefilter banks for discrete multiwavelet transforms

Tai Chu Hsung, Pak Kong Lun, K. C. Ho

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)


Traditional design of critically sampled prefilters for discrete multiwavelet transform ignores the preservation of the linear phase property, which is important for many applications, such as image coding and digital communications. Balanced multiwavelets solve this problem but make the filters longer. By using linear phase filter banks, we propose a simple algorithm for the design of orthogonal symmetric prefilter banks that can be used with the discrete multiwavelet transform. The prefilter bank resulted is orthogonal and critically sampled and can preserve the approximation power of the multiwavelet as well as the linear phase property. Experimental results show that the systems using the proposed symmetric prefilter banks give better performance as compared with using nonlinear phase prefilters.
Original languageEnglish
Pages (from-to)145-148
Number of pages4
JournalIEEE Signal Processing Letters
Issue number3
Publication statusPublished - 1 Mar 2006


  • Approximation order
  • Linear-phase paraunitary filterbank
  • Multiwavelets
  • Orthogonality
  • Prefilter
  • Wavelets

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Signal Processing

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