An arrangement relating to electronic alarm systems that...

G - Physics – 08 – B

Patent

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Details

G08B 13/22 (2006.01) G01S 13/74 (2006.01) G08B 13/24 (2006.01)

Patent

CA 2256375

An arrangement pertaining to electronic alarm systems of the kind used in goods monitoring systems includes an alarm element (1) that is adapted to receive a magnetic alternating field which is transmitted from a transmitter (2) by means of a transmitter coil (3) and whose frequency is swept, wherein the alarm element is adapted to retransmit a magnetic alternating field, and wherein a receiver (4) that includes a receiver coil (5) is adapted to receive and detect the retransmitted alternating field. The invention is characterized in that the system transmitter (2) is adapted for variation of the transmitted frequency; in that the system receiver (4) is adapted to receive and detect the occurrence of a signal from a disturbing other system; in that there is provided a control circuit (8) which is adapted to analyze the frequency and phase position of a signal transmitted from a disturbing system in relation to the frequency and phase position of the alternating field transmitted from the first system; and in that the control circuit (8) is adapted to deliver to the transmitter (2) of the first-mentioned system a control signal that displaces the transmitted frequency so that the first system is not disturbed by the disturbing signal.

L'invention concerne un dispositif faisant partie de systèmes d'alarme électronique du type de ceux utilisés dans les systèmes de contrôle de marchandises. Ce dispositif comprend un élément d'alarme (1) conçu pour recevoir un champ alternatif magnétique émis depuis un émetteur (2) par une bobine (3) et dont la fréquence est balayée. Cet élément d'alarme permet de retransmettre un champ alternatif magnétique. Le dispositif comporte également un récepteur (4) comprenant une bobine (5) adaptée pour recevoir et détecter le champ alternatif retransmis. Cette invention se caractérise en ce que l'émetteur (2) du système est conçu pour faire varier la fréquence transmise; et le récepteur (4) du système pour recevoir et détecter l'apparition d'un signal provenant d'un autre système perturbateur. L'invention comporte également un circuit de commande (8) destiné à analyser la fréquence et la position de phase d'un signal émis depuis un système perturbateur en relation avec la fréquence et la position de phase du champ alternatif émis depuis le premier système. Ce système de commande (8) envoie à l'émetteur (2) du premier système susmentionné un signal de commande qui déplace la fréquence émise de sorte que le premier système ne soit pas perturbé par le signal perturbateur.

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