Selective enhancement of space-time broadband spiral-waves using 2D IIR digital filters

Broadband space-time spiral-waves have received much attention in bioelectromagnetics and chaotic systems. They occur as propagating waves in non-linear active-media, such as the surface of the heart. A novel first-order 2D IIR practical-BIBO stable non-separable digital filter, based on a 2D signal...

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Bibliographic Details
Main Authors: Madanayake, H.L.P. Arjuna, Bruton, Len T.
Format: Conference Proceeding
Language:English
Subjects:
Biosensors
Chaos
Circuit theory
Computational complexity
Digital filters
Filtering theory
Heart
IIR filters
Jamming
Surface waves
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Summary:Broadband space-time spiral-waves have received much attention in bioelectromagnetics and chaotic systems. They occur as propagating waves in non-linear active-media, such as the surface of the heart. A novel first-order 2D IIR practical-BIBO stable non-separable digital filter, based on a 2D signal derived from a circular-array of sampled sensors, is proposed for the real-time broadband highly-selective enhancement of broadband Archimedean spiral-waves and circular-waves in the presence of undesired spiral-waves. The proposed filter employs the spatio-temporal helix-transform, which is a form-preserving transform that converts a noncomputable 2D difference-equation into an equivalent 1D difference-equation. This transformation converts a noncomputable 2D IIR digital filter into a computable, and practically useful, 1D IIR approximate equivalent filter. The selective enhancement of broadband Gaussian spiral-wave and circular-waves are demonstrated where the desired spiral-waves are shown to be enhanced by approximately 22 dB. The computational complexity of the proposed filter is low, employing 3 multiplications and 6 additions/subtractions per output sample.
ISSN:0271-4302
2158-1525
DOI:10.1109/ISCAS.2008.4541513