Linear-predictive data extrapolation for narrow-band spectral estimation

Article Abstract:

An analysis of a hybrid Fourier-Burg narrow-band spectral estimation algorithm developed in 1973 by T.J. Ulrych and others reveals several advantages over the respective Fourier and Burg MEM estimator algorithms. The hybrid Fourier-Burg method involves data extrapolation and offers such advantages as: superior resolution compared to conventional Fourier, less sensitivity to model order than Burg MEM, frequency estimation variance superior to Burg and approaching conventional Fourier for low signal-to-noise ratios, and improved detection of weak signals comparable to windowed Fourier. Both simulations and real data validate these advantages.

Noncommercial research organizations, Algorithms, Image processing, Algorithm, Evaluation, Signal processing, Comparison, Scientific Research, Filtering

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Three-dimensional computer model of electric fields in internal defibrillation

Article Abstract:

A simplified three-dimensional computer model of the electric fields produced by internal defibrillation electrodes is presented. The model helps determine strategies for delivering shocks to the heart. It uses a finite analysis technique to calculate energy and current density distributions in patch-patch, catheter-patch, and catheter-catheter electrode configurations; supplies detailed information concerning electrode size, placement, and conductivity; and validates many experimental observations and hypotheses.

Medicine, Heart, Circulatory system, Three dimensional graphics, Applications, Models, Simulation, Three-Dimensional Graphics, Cardiovascular System, technical

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