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Evaluation method and apparatus for determining the time stationarity of measured physiological signals



Evaluation method and apparatus for determining the time stationarity of measured physiological signals



Official Gazette of the United States Patent and Trademark Office Patents 1282(1)



An evaluation method that includes: recording the values of a physiological signal during a certain measuring period; dividing the obtained time series of signal values into individual segments; mapping successive subsets of the individual signal values in a segment on associated symbol series according to the criterion of whether a respective signal value increases or decreases as compared to the preceding signal value; determining the frequencies of the varying symbol series; determining a testing parameter which reflects the frequency ratio, within a segment, of correlated symbol series to anti-correlated symbol series; determining the relative difference of the testing parameters of two adjacent segments; and comparing the relative difference of two testing parameters with a given threshold as a criterion for the stationarity of the time series of the recorded physiological signal.

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Accession: 034877929

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