Anti-theft alarm with coded radio link
AssigneeVoxon S.p.A.
InventorLeone Glicerio Sattin
Life of this patent
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Abstract
At a protected site, intrusion sensors are connected to a radio transmitter which signals a remote receiver. In the transmitter, a code matrix is scanned in response to signals from a clock pulse generator to produce a coded pulse sequence. The receiver has a matching matrix arrangement to render it responsive only to the particular pulse sequence of its associated transmitter. When the system is not in use, the receiver is stored in a container arranged to automatically deactivate the system when the receiver is present and automatically activate the system when the receiver is removed.
Claims7
A remote signalling system for indicating unauthorized access to a protected area comprising:
- A transmitting unit adapted for stationary location at the protected area and including a clock signal generator;
- first code matrix means connected to said clock signal generator and adapted to be programmed according to a predetermined code and responsive to clock signals from said clock signal generator for supplying a pulse signal sequence indicative of the predetermined code;
- a radio transmitter connected to said first code matrix means for transmitting radio signals of the pulse signal sequence;
- and activating means responsive to unauthororized access to the protected area for activating said clock signal generator;
- and
- a receiving unit including a radio receiver for receiving radio signals transmitted by said radio transmitter;
- and second code matrix means connected to said radio receiver and adapted to be programmed according to the same predetermined code and responsive to receipt of radio signals of the pulse signal sequence for generating an alarm indication.
Dependencies are inferred from the claim text.