FIELD: radio engineering, detection of signals of various physical nature ( acoustic, electric, magnetic and so on ), detection of magnetic field formed by operating sound-recording equipment. SUBSTANCE: proposed device has antenna, amplifier and filter connected in series, indicator and unit for threshold selection of signals. It is inserted with analog-to-digital converter, unit computing averaged-summary spectrum of signals and noises, commutator, storage, spectrum comparator and unit identifying noises. EFFECT: possibility of detection of signals which level is many times less than level of noises. 1 dwg
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