FIELD: electronic engineering. SUBSTANCE: method involves dividing components of transformed signal power into items in a series of discrete reference values with following spectral transformation of the reference values obtained. Device has analog-to-digital converter, memory unit, Fourier-transformation unit, Fourier-transformation unit, multiplier, unit for determining power spectrum density and inverse fast Fourier- transformation, unit for determining frequency, control unit and clock pulse bus. EFFECT: enhanced accuracy of estimation. 19 cl, 114 dwg
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