FIELD: radio communications.
SUBSTANCE: device has converter of vibrations of controlled objects to electric signal, made in form of piezoelectric element, mounted on controlled object, amplifier, low and high frequency filters, first and second amplitude detectors, first and second integrators, first and second comparators with adjustable switching thresholds, block for determining time characteristics of signals, block for forming of alarm message.
EFFECT: higher interference resistance of device, lower possibility of false alarm, simplified manufacture and assemblage.
2 dwg
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