METHOD OF DETECTING HARMONIC COMPONENTS AND FREQUENCIES THEREOF IN DISCRETE SIGNALS Russian patent published in 2013 - IPC G01R23/00 

FIELD: physics.

SUBSTANCE: method involves performing direct Fourier transformation of the analysed discrete signal in form of 2ⁿ dimensional fast Fourier transformation, determining complex conjugate values of the results of direct Fourier transformation of the analysed discrete signal, pairwise multiplication of the obtained complex signals of direct Fourier transformation of the analysed discrete signal with complex conjugate values of direct Fourier transformation of the analysed discrete signal; from the obtained product P_j, values are selected and m M^k signals are formed; the obtained M^k signals are subjected to inverse Fourier transformation Z^k=F^-1[M^k]; a frequency-time autocorrelation function is determined. The obtained results are used to plot the curve of the frequency-time autocorrelation function R(f, t), from which presence of harmonic components and frequencies thereof in the analysed discrete signals are determined.

EFFECT: detecting harmonic components and frequencies thereof in a discrete signal from an autocorrelation function.

4 dwg, 1 tbl