METHOD TO FILTER METERING SIGNALS Russian patent published in 2012 - IPC H03H19/00 

FIELD: information technologies.

SUBSTANCE: input metering signal U_INP(t), to be filtered, is summed simultaneously with inverted equal-amplitude polynomials and representing sums from N_MAX, N₀ and N_MIN harmonic oscillations of multiple frequencies and equal amplitudes, equal-amplitude polynomials are reproduced in the form of amplitude-modulated oscillations, a law of envelope variation of each one is defined by ratio of instantaneous values of sinusoidal oscillations of equal amplitudes, at the same time frequency of a dividend is N times higher than repetition frequency of a filtered signal, and frequency of a divisor is equal to repetition frequency of a filtered signal.

EFFECT: accurate identification of a separately taken harmonic oscillation, frequency of which is multiple to repetition frequency of a metering signal.

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