METHOD FOR ANALYSIS OF FREQUENCY DISTORTIONS AND DEVICE FOR ITS REALIZATION Russian patent published in 2007 - IPC G01R23/20 

FIELD: radio measurements, applicable at construction of meters of the level of frequency distortions introduced by frequency-dependent devices, for example, by amplifiers of audio signal.

SUBSTANCE: the offered method for analysis of frequency distortions introduced by a four-terminal network consists in supply of a test noise signal to the input of the studied four-terminal network, the spectrum of the output signal of the four-terminal network is divided into N+1 equal frequency bans, the reference signal occupying one of the mentioned bands is separated from the spectrum of the output signal, the dispersion of the reference signal and the dispersions of the partial signals corresponding to the other N frequency bands are measured, N differences of the partial signals and the reference signal are determined, the root-mean-square value of the obtain N differences is found, the frequency distortions are determined by the found root-mean-square value decreased by the number of times equal to the measured value of dispersion of the reference signal. The device for analysis of the frequency distortions has a noise generator, unit for measurement of the reference signal dispersion, unit for measurement of dispersions of partial signals, group of subtracters and a function generate interconnected by a definite manner.

EFFECT: enhanced information content of frequency distortions introduced by the four-terminal network in the original signal.

5 cl, 2 dwg