FIELD: measurement technology; analog-to-digital conversion of signals. SUBSTANCE: according to first invention, second auxiliary pseudorandom signal is used; first periodic auxiliary presurandon signal is of saw-tooth shape; prior to modulating input signal by first signal, first auxiliary pseudorandom signal is additionally modulated by second auxiliary pseudorandom signal. According to second invention, first auxiliary pseudorandom signal is obtained by modulating source periodic pseudorandom signal with auxiliary signal containing at least one component varying source signal within one sampling interval. EFFECT: eliminated sampling error during conversion. 10 cl, 7 dwg
