FIELD: alarm systems.
SUBSTANCE: present invention pertains to security technology and can be used for detecting unauthorised access into protected facilities. The method is based on detecting changes in the parameter of an acoustic signal, propagated inside the protected facilities. The parameter used is reduction of the amplitude-frequency response at the fundamental resonance frequency of the facilities.
EFFECT: faster operation, increased immunity to thermal noise and accurate detection of unauthorised access.
1 dwg
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