METHOD AND APPARATUS FOR DIGITAL SPECTRAL-TIME ANALYSIS OF SIGNALS

摘要

FIELD: physics.SUBSTANCE: method is based on decomposing signals into empirical modes, which includes: a) sampling; b) selecting process extrema; c) constructing upper and lower envelopes; d) calculating a smoothed component as an average value between the envelopes; e) extracting a sign-variable component as the difference between the initial and the smoothed components; f) estimating current frequencies and amplitudes or power values for each component using Hilbert spectral analysis; g) repeating steps (b) through (f) over the smoothed component, wherein construction of the upper and lower envelopes is performed based on the maxima and minima of the selected extrema, without subsequent calculation of envelopes at points between like extrema; selecting the smoothed component directly from the sequence of process extrema, wherein formation of a smoothed sequence of extrema is carried out by calculating an average of the average values of the current and previous extrema and average values of the current and next extrema; selecting the time-variable component by subtraction from the initial smoothed sequence of extrema. An apparatus which carries out said method is also disclosed.EFFECT: easier digital signal processing.3 cl, 5 dwg