Electronics Letters · 1993 · 11 citations · 0 references
EngineeringElectrical EngineeringAnalog ElectronicsComputer-aided DesignMicroelectronicsDigital Signal ProcessingSmall-signal AnalysisAll-pass FiltersFilter Bank DesignFilter DesignFilter SynthesisFinite Impulse Response FiltersLinear Filter Design
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.