Method and apparatus to detect a plurality of security tags
First Claim
1. A method to detect security tags, comprising:
- establishing art interrogation zone using at least two signals operating at different frequencies;
monitoring said interrogation zone to detect a plurality of security tags, with a first type of security tag responsive to at least a first signal at a first frequency and a second type of security tag responsive to at least a second signal at a second frequency;
determining whether to generate an alarm if a security tag is detected by receiving a third signal at a third frequency, said third signal comprising a combination of said first and second signals from a first security tag of said first type and filtering said third signal to remove frequency components of only said first signal; and
generating said alarm in accordance with said determination.
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Accused Products
Abstract
A method and apparatus to detect a plurality of different security tags are described. A method to detect security tags may include establishing an interrogation zone using at least two signals operating at different frequencies; monitoring the interrogation zone to detect a plurality of security tags, with a first type of security tag responsive to at least a first signal at a first frequency and a second type of security tag responsive to at least a second signal at a second frequency; determining whether to generate an alarm if a security tag is detected by receiving a third signal including a combination of the first and second signals from a first security tag of the first type and filtering the third signal to remove frequency components of the first signal; and generating the alarm in accordance with said determination.
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Citations
32 Claims
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1. A method to detect security tags, comprising:
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establishing art interrogation zone using at least two signals operating at different frequencies; monitoring said interrogation zone to detect a plurality of security tags, with a first type of security tag responsive to at least a first signal at a first frequency and a second type of security tag responsive to at least a second signal at a second frequency; determining whether to generate an alarm if a security tag is detected by receiving a third signal at a third frequency, said third signal comprising a combination of said first and second signals from a first security tag of said first type and filtering said third signal to remove frequency components of only said first signal; and generating said alarm in accordance with said determination. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method to detect security tags, comprising:
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receiving a first and second signal having a first and second frequency, respectively, at a first security tag of a first type; receiving said second signal at a second security tag of a second type; transmitting a third signal at a third frequency, said third signal comprising a combination of said first and second signals from said first security tag to a reader system in response to said first and second signals, said reader system configured to filter said third signal to remove frequency components of only said first signal; and transmitting a fourth signal from said second security tag in response to said second signal, with said fourth signal representing an identifier for said second security tag and a first code. - View Dependent Claims (11, 12)
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13. A security system, comprising:
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at least one antenna; a transceiver to connect to said antenna and establish an interrogation zone; a first security tag of a first type to communicate with said transceiver, said first security tag responsive to at least a first signal at a first frequency; a second security tag of a second type to communicate with said transceiver, said second security tag responsive to at least a second signal at a second frequency; and a reader system to connect to said transceiver and to determine whether either security tag is within said interrogation zone by receiving a third signal at a third frequency, said third signal comprising a combination of said first and second signals from said first security tag and filtering said third signal to remove frequency components of only said first signal. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A security system, comprising:
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at least one antenna; a transceiver to connect to said antenna and establish an interrogation zone using at least a first signal at a first frequency and a second signal at a second frequency; and a reader system to connect to said transceiver and configured to detect different security tags within said interrogation zone by receiving a third signal at a third frequency, said third signal comprising a combination of said first and second signals and filtering said third signal to remove frequency components of only said first signal. - View Dependent Claims (20, 21, 22, 23, 24)
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25. An article comprising:
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a storage medium; said storage medium including stored instructions that, when executed by a processor, result in detecting security tags by establishing an interrogation zone using at least two signals operating at different frequencies, monitoring said interrogation zone to detect a plurality of security tags, with a first type of security tag responsive to at least a first signal at a first frequency and a second type of security tag responsive to at least a second signal at a second frequency, determining whether to generate an alarm if a security tag is detected by receiving a third signal at a third frequency, said third signal comprising a combination of said first and second signals from a first security tag of said first type and filtering said third signal to remove frequency components of only said first signal, and generating said alarm in accordance with said determination. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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Specification