FIELD: transmission of digital information readings in the form of analog signal complemented with redundant information signal. SUBSTANCE: at least one reference point is chosen among digital information readings on sending end; value of analog signal whereto digital information readings are converted is determined using second function of readings at each chosen reference point; readings chosen at reference points are converted into redundant information signal to complement analog signal; difference between power levels is chosen to transmit more significant bits of each information reading depending on desired signal-to-noise ratio at receiving-end input; power levels whose difference is lower than that chosen for power levels of more significant bits are selected for transmitting readings at reference points readings of lower capacity; on receiving end less significant bits are found from recovered digital readings by subtracting more significant bits; found less significant bits are used to construct envelope with aid of second function of readings and value of this envelope is found at respective reference point; this envelope value is compared with respective value of signal recovered from received signal; if compared values do not coincide, set of digital readings affording this coincidence is selected to ensure desired noise immunity. EFFECT: enhanced throughput of communication channel without reducing noise immunity of data transmission. 5 cl, 4 dwg, 1 tbl
