Performance Analysis and Prototype Filter Design for Perfect-Reconstruction Cosine-Modulated Filter Banks With Fixed-Point Implementation

Ryan B. Casey, Tanja Karp

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Cosine modulated filter banks have gained popularity for their ability to provide perfect reconstruction (PR) while maintaining an efficient design and implementation. However, this effectiveness is hindered if the filter bank is implemented in the fixed-point domain where quantization, rounding, and overflow occur, and result in reconstruction errors. In this article we demonstrate how to maintain PR of the filter bank when implementing it in fixed-point number format with constant wordlength. We explore how the frequency selectivity of the analysis and synthesis filters changes from the floating point ones due to fixed-point errors and present new design criteria for filter banks that will be implemented in fixed-point number format.

Original languageEnglish
Pages (from-to)452-456
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Volume52
Issue number8
DOIs
StatePublished - Aug 2005

Keywords

  • Cosine modulated filter banks
  • fixed-point implementation
  • perfect reconstruction (PR)

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