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UDC 004.932.2

PHOTOPLETHYSMOGRAPHIC SIGNAL SPECTRUM ANALYSIS USING MODIFIED PRONY’S METHOD

D. V. Avramenko, graduate student RSREU; This email address is being protected from spambots. You need JavaScript enabled to view it.
V. G. Andrejev, PhD, Dr. in technical sciences, full professor, department of radioengineering systems, RSREU;
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The problem of spectral estimation of photoplethysmographic signal is considered. The aim of the work is to improve the quality of spectral analysis of multifrequency light reflections from biological tissues by a modified Prony's method and to assess the dynamics of heart rate on a short (tens of heart attacks) sample of observations. The method of observed data description by the sum of exponential functions is analyzed. It is shown that the ΔF values of relative deviations of estimated dominant frequencies from the true ones are significantly reduced (from 2 to 4 times) by using the modified Prony's least squares method as compared to the autoregressive spectral analysis method, which smoothly changes its
intensity of Y process of light reflections from biological tissues for noninvasive diagnosis of patient's health

Key words: modified Prony's method, photoplethysmogram, spectral parametric estimation, digital processing of biomedical signals, redefined system of Yule – Walker equations, quasi-inverse matrix, weighted vector, non-invasive diagnostics.

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