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Direct design of approximately linear phase (ALP) 2-D IIR digital filters

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2 Author(s)
Anderson, M.S. ; Warwick Univ., Coventry, UK ; Lawson, S.S.

A fast design method is presented for approximately linear phase (ALP) 2-D IIR digital filters composed of a parallel connection of two allpass subfilters. The technique exploits the fact that the filter transform function depends on the phase of each subfilter. A closed form expression is derived for the phase and the filter coefficients of each subfilter are obtained by solving a set of overdetermined linear simultaneous equations.

Published in:

Electronics Letters  (Volume:29 ,  Issue: 9 )