Loss prevention system
First Claim
Patent Images
1. A loss prevention system comprising:
- a protected article comprising a transmitter that emits an infrared signal, the infrared signal having a carrier frequency that is modulated to encode a digital signature, the protected article being located in a room; and
a receiver that detects infrared signals, the receiver mounted at a fixed position within the room, the receiver performing an alarm action if the receiver does not detect within a rolling time window an infrared signal having the carrier frequency that is modulated to encode the digital signature; and
a second protected article, the second protected article comprising a second transmitter that emits a second infrared signal, the second infrared signal having a second carrier frequency that is modulated to encode a second digital signature, the second protected article located in the room;
wherein the receiver performs the alarm action if the receiver does not detect within a second rolling time window an infrared signal having the second digital signature.
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Accused Products
Abstract
A loss prevention system comprises a protected article and a receiver. The protected article and the receiver are located in the same room. The loss prevention system can help to prevent loss or theft of the protected article. The protected article comprises a transmitter that emits an infrared signal. The infrared signal has a carrier frequency that is modulated to encode a digital signature. The receiver detects infrared signals. The receiver performs an alarm action if the receiver does not detect within a rolling time window an infrared signal having the carrier frequency that is modulated to encode the digital signature.
20 Citations
18 Claims
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1. A loss prevention system comprising:
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a protected article comprising a transmitter that emits an infrared signal, the infrared signal having a carrier frequency that is modulated to encode a digital signature, the protected article being located in a room; and a receiver that detects infrared signals, the receiver mounted at a fixed position within the room, the receiver performing an alarm action if the receiver does not detect within a rolling time window an infrared signal having the carrier frequency that is modulated to encode the digital signature; and a second protected article, the second protected article comprising a second transmitter that emits a second infrared signal, the second infrared signal having a second carrier frequency that is modulated to encode a second digital signature, the second protected article located in the room; wherein the receiver performs the alarm action if the receiver does not detect within a second rolling time window an infrared signal having the second digital signature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of installing a loss prevention system, the method comprising:
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placing a protected article in a room, the protected article comprising a transmitter that emits an infrared signal, the infrared signal having a carrier frequency that is modulated to encode a digital signature; mounting a receiver in the room, the receiver detecting infrared signals, the receiver mounted at a fixed position within the room, the receiver performing an alarm action if the receiver does not detect within a rolling time window an infrared signal having the carrier frequency that is modulated to encode the digital signature; placing a second protected article in the room, the second protected article comprising a second transmitter that emits a second infrared signal, the second infrared signal having the carrier frequency, the carrier frequency modulated to encode a second digital signature; and performing by the receiver, the alarm action if the receiver does not detect within a second rolling time window an infrared signal that carries the second digital signature. - View Dependent Claims (16, 17)
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18. A method of installing a loss prevention system, the method comprising:
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placing a protected article in a room, the protected article comprising a transmitter that emits an infrared signal, the infrared signal having a carrier frequency that is modulated to encode a digital signature; mounting a receiver in the room, the receiver detecting infrared signals, the receiver mounted at a fixed position within the room, the receiver performing an alarm action if the receiver does not detect within a rolling time window an infrared signal having the carrier frequency that is modulated to encode the digital signature; after mounting the receiver in the room, programming the receiver to perform the alarm action when the receiver does not detect within the rolling time window the infrared signal having the carrier frequency that is modulated to encode the digital signature; placing a second protected article in the room, the second protected article comprising a second transmitter that emits a second infrared signal, the second infrared signal having the carrier frequency, the carrier frequency modulated to encode a second digital signature, wherein the receiver performs the alarm action if the receiver does not detect within a second rolling time window an infrared signal that carries the second digital signature; connecting the receiver to a communications network; and sending an alarm message to an alarm control center via the communications network.
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Specification