Rolling code security scheme for tag detection robustness
First Claim
1. A method for detecting the presence of a security tag, comprising:
- performing operations by a master pedestal of an Electronic Article Surveillance (“
EAS”
) system to determine a first Tx/Rx scheme to be used during a first iteration of an EAS tag detection process based on(A) a first total number of time windows randomly selected from a plurality of total number of time windows in which an EAS exciter signal should be transmitted from at least one pedestal, and(B) first time windows randomly selected from a plurality of time windows in which the EAS exciter signal can be sent during the EAS tag detection process;
communicating information specifying the first Tx/Rx scheme from the master pedestal to at least one slave pedestal of the EAS system;
performing transmit and receive operations by the master and slave pedestals in accordance with the first Tx/Rx scheme; and
transmitting the EAS exciter signal from the at least one pedestal a first number of times during a second iteration of the EAS tag detection process, where the first number of times is different than a second number of times the EAS exciter signal was transmitted from the at least one pedestal during the first iteration of the EAS tag detection process;
wherein the first Tx/Rx scheme specifies during which time windows of the plurality of time windows a pedestal is to only transmit, only receive, or both transmit and receive.
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Accused Products
Abstract
Systems (100) and methods (900) for detecting the presence of a security tag. The methods involve performing operations by a master pedestal of an EAS system to determine a first Tx/Rx scheme to be used during a first iteration of an EAS tag detection process based on (A) a first total number of time windows randomly selected from a plurality of total number of time windows in which an EAS exciter signal should be transmitted from at least one pedestal, and (B) first time windows randomly selected from a plurality of time windows in which the EAS exciter signal can be sent during the EAS tag detection process. Information specifying the first Tx/Rx scheme is communicated from the master pedestal to at least one slave pedestal. Transmit and receive operations are performed by the master and slave pedestals in accordance with the first Tx/Rx scheme.
16 Citations
20 Claims
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1. A method for detecting the presence of a security tag, comprising:
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performing operations by a master pedestal of an Electronic Article Surveillance (“
EAS”
) system to determine a first Tx/Rx scheme to be used during a first iteration of an EAS tag detection process based on(A) a first total number of time windows randomly selected from a plurality of total number of time windows in which an EAS exciter signal should be transmitted from at least one pedestal, and (B) first time windows randomly selected from a plurality of time windows in which the EAS exciter signal can be sent during the EAS tag detection process; communicating information specifying the first Tx/Rx scheme from the master pedestal to at least one slave pedestal of the EAS system; performing transmit and receive operations by the master and slave pedestals in accordance with the first Tx/Rx scheme; and transmitting the EAS exciter signal from the at least one pedestal a first number of times during a second iteration of the EAS tag detection process, where the first number of times is different than a second number of times the EAS exciter signal was transmitted from the at least one pedestal during the first iteration of the EAS tag detection process; wherein the first Tx/Rx scheme specifies during which time windows of the plurality of time windows a pedestal is to only transmit, only receive, or both transmit and receive. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An Electronic Article Surveillance (“
- EAS”
) system, comprising;a master pedestal having an electronic circuit configured to; determine a first Tx/Rx scheme to be used during a first iteration of an EAS tag detection process based on (A) a first total number of time windows randomly selected from a plurality of total number of time windows in which an EAS exciter signal should be transmitted from at least one pedestal, and (B) first time windows randomly selected from a plurality of time windows in which the EAS exciter signal can be sent during the EAS tag detection process; communicate information specifying the first Tx/Rx scheme to at least one slave pedestal of the EAS system; perform transmit and receive operations in accordance with the first Tx/Rx scheme; and perform transmit operations to cause the EAS exciter signal to be transmitted from the master pedestal a first number of times during a second iteration of the EAS tag detection process, where the first number of times is different than a second number of times the EAS exciter signal was transmitted from the at least one pedestal during the first iteration of the EAS tag detection process wherein the first Tx/Rx scheme specifies during which time windows of the plurality of time windows the master pedestal and the slave pedestal are to only transmit, only receive, or both transmit and receive. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
- EAS”
Specification