Lowpass filters realizable as coupled allpasses: Design via a new flat delay filter

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper describes a new class of maximally flat lowpass recursive digital filters. The filters are realizable as a parallel sum of two allpass filters, a structure for which low-complexity low-noise implementations exist. Note that, with the classical Butterworth filter of degree N, which can be retrieved as a special case, it is not possible to adjust the delay (or phase-linearity). However, with the more, general class of filters described in this paper, the adjustment of the delay becomes possible, and the trade-off between the delay and the phase-linearity can be chosen. The construction of these lowpass filters depends upon a new maximally flat delay allpole filter, for which the degrees of flatness at ω=0 and ω=π are not necessarily equal. For the coefficients of this flat delay filter, an explicit solution is introduced, which also specializes to a previously known result.

Original languageEnglish (US)
Title of host publication1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing, DFSP 1998
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages135-138
Number of pages4
ISBN (Print)0780349571, 9780780349575
DOIs
StatePublished - 1998
Event1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing, DFSP 1998 - Victoria, Canada
Duration: Jun 5 1998Jun 6 1998

Publication series

Name1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing, DFSP 1998

Other

Other1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing, DFSP 1998
CountryCanada
CityVictoria
Period6/5/986/6/98

ASJC Scopus subject areas

  • Hardware and Architecture
  • Signal Processing

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