Patent ID: 6335683
Filing Date: 2002-01-01
Classification: G08B

Abstract:
A method for discriminating between signals generated by at least one means sensitive to variations in the pressure of a gaseous fluid constituting the atmosphere of premises, for the purpose of detecting an intrusion into these premises (2), this process using a device (1) which:operates by detecting at least one variation in the pressure of the prevailing gaseous atmosphere (3) in said premises (2), and comprises at least: one means (5) which, being sensitive to variations in the pressure of the gaseous atmosphere of the premises, is capable of generating at least one electrical signal (S) reflecting at least the variations in this pressure and, at least one means (6) using this signal to inform people of the detection of an intrusion into the premises equipped with this device, this process being characterized in that, in order to discriminate between the electrical signals: when the means (5) sensitive to pressure variations generates an electrical signal, the evolution of the amplitude of at least one characteristic of this signal is monitored and, when two successive amplitude variations (A1, A2) substantially opposite relative to a median value (M) are detected, the means (6) for informing people is inhibited, whereas when amplitude variations of a different type are detected, the means (6) for informing people is activated.