FIELD: data signals.
SUBSTANCE: method and device are used for extraction of additional data from data signal containing at least first z1 and second z2 channels, while each of which has similar selections w of additional data, inserted into given positions of signal selection. Method includes comparison 62 of first series of given selections of signal of first channel, separated by given number M of signal selections, to appropriate second series of selections from second channel signal and displacement 65 of first and second series for one selection position and comparison operation for first and second series is repeated until series become similar again.
EFFECT: higher efficiency.
2 cl, 6 dwg
