ALARM SECURITY DEVICE Russian patent published in 2000 - IPC

FIELD: security equipment, in particular, protection against intrusion causing destruction of glass structures. SUBSTANCE: device analyzes acoustic signals that arise upon glass surface destruction in two frequency ranges, one of which describes shock impact onto protected structure, another one glass destruction, since both types of actions are most typical for such intrusion. EFFECT: increased functional reliability, due to additional digital processing of glass destruction signal (increased stability to noise) and information about electric power voltage drop below tolerance limit (to prevent loss of monitoring). 3 cl, 2 dwg