Abstract: Process for operating a security system, for the protection of persons and belongings, comprising a warning device (2) triggerable by a control unit (3), a unit (11) for activating a signalling device (7) and a means (6) of unlocking an electrically controlled lock (5), this process consisting:—in activating a timeout unit when the control unit is invoked so as to engage a timeout interval (T1),—in activating the element for unlocking the lock when the said activation unit is invoked during the timeout interval (T1), and in disabling the signalling device during the aforesaid timeout interval (T1) so that this signalling device can be activated only if the said activation unit is invoked outside of the timeout interval (T1).

Abstract: A burglar-proof device designed to be fixed on one surface of a receiving wall located in or proximate to at least part of the periphery of an opening panel such as a door or a shutter, includes an elongated tubular element (7, 25) having a support wall (8) urged to be supported on the receiving surface (5), at least a fixing member (12, 12a) passing through a passage provided in the support wall (8) of the elongated element and which is fixed on the opening panel (2), at least an elastic return member (15) arranged in the elongated element, and at least a movement sensor mounted in the elongated element and co-operating with the receiving wall, so that, when the elongated element is stressed to counter the elastic member and moves away from the receiving wall, the movement sensor is capable of delivering an electric signal.

Abstract: Monitoring and/or alarm device and process including a central unit, at least one intrusion detection peripheral facility, signalling elements and radio link elements allowing radio links on several redundant channels between the central unit and at least one intrusion detection peripheral facility, via which channels this peripheral facility is able to transmit signals to this central unit and wherein elements check the capacity or availability of each of the link channels to transmit the expected signals, elements count the number of available channels and/or the number of unavailable channels and transmission elements transmit to the signalling elements a control signal corresponding to the number of available channels and/or to the number of unavailable channels so as to selectively activate these signalling elements as a function of the state of the control signal.

Abstract: A radio receiver with isolation between an antenna and a regenerative oscillator/detector. The isolation is provided by periodically (at the receiver's quench frequency) uncoupling the antenna from the regenerative oscillator/detector. The receiver preferably includes an antenna, a super-regenerative oscillator/detector, a clock that indicates the quench frequency, a timing circuit coupled to the clock, and a switch coupled to the antenna, to the oscillator/detector, and to the timing circuit. The timing circuit specifies a first part and a second part of each clock period. During the first part of each clock period, the switch at least partially couples the antenna to the oscillator/detector on the nominal reception frequency. During the second part of each clock period, the switch at least partially uncouples these two elements on the nominal reception frequency.

Abstract: A process for allowing two or more receivers to share the same nominal frequency or close nominal frequencies, preferably without these receivers blinding one another or disturbing one another is described. The process preferably includes subjecting a radiator to temporally spaced phases of operation or maximum radiation and temporally segregating the phase sensitivity of the oscillator/detector of the receivers with respect to the phase operation or the radiation of the receiver. The receiver during the phase of sensitivity of its oscillator/detector may not detect the electromagnetic radiation from the radiator.

Abstract: Device for receiving signals, in particular radio signals, on at least two channels characterized by different carrier frequencies for each of the channels, comprising at least two receivers responsive to respective carrier frequencies and connected to a direct current electrical power supplied between at least two respective terminals. The two receivers (2, 3) are disposed in series between the two poles of a common direct current electrical power supply (13) so that one terminal of one of said receivers is connected to one pole of the power supply, one terminal of the other receiver is connected to the other pole of the power supply and their other terminals are connected together. In one embodiment, a first voltage regulator (16) regulates the voltage at the terminals of the receivers in series and a second voltage regulator (17) regulates the voltage of one of the receivers (3).