FIELD: measurement.
SUBSTANCE: invention relates to measurement equipment. Disclosed is a method of extracting a useful signal from an input signal containing a useful signal and an interference signal, which consists in extracting a correcting signal and subtracting the correcting signal from the input signal. Interference signal used is an intermediate signal, which is a result of decimation of the input signal, wherein so that the value of the Nyquist frequency of the obtained intermediate signal is less than the frequency of the useful signal, wherein number of intermediate signal trajectory crosses average level of input signal is proportional to correlation coefficient of useful signal and noise signal.
EFFECT: high efficiency of extracting a useful signal from an input signal containing a useful signal and an interference signal, which are in the same frequency range, due to reduction or complete elimination of distortion of the shape of the useful signal simultaneously with increasing the signal-to-noise ratio.
1 cl, 4 dwg
