FIELD: mining.
SUBSTANCE: in compliance with claimed process, several pairs of "amplifier-time selector" circuits are additionally used for received acoustic signal. Said circuits are controlled by generated control signals, their magnitude for further circuits depending upon duration of previous "amplifier-time selector" circuit power surges. Quantity of circuits is selected proceeding from preset SNR defined by analytical relationship. The latter comprises such parameters as useful signal, input noise signal, signal of noise from time selector power surges, amplifier gain factor, time selector circuit rejection factor and quantity of pairs of "amplifier-time selector" circuits.
EFFECT: higher validity of control.
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