Adaptively transmitting a signal for activating a tag
First Claim
Patent Images
1. An apparatus for transmitting a signal for activating a tag comprising:
- a transmitter for transmitting a transmission signal in the form of a transmission burst adapted to activate a tag to enable detection thereof;
a transmitter controller for providing a transmission waveform, said transmission waveform having a frequency, duty cycle and duration determined for optimal activation and detection of the tag;
a receiver for detecting and identifying a responsive signal transmitted by the tag activated by said transmission burst, said receiver including;
a signal analysis device for;
receiving the transmission signal;
analyzing the transmission signal to determine effects of a load as compared with a reference signal; and
adjusting the transmitter controller to compensate for the effects of the load on the transmission signal by generating instructions to send an adjusted transmission signal corresponding to the reference signal.
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Accused Products
Abstract
Adaptive transmission of a tag activation signal and detection of a tag. By monitoring the effects of a load on a tag activation signal, a signal analyzer adjusts the transmission waveform from which the signal is generated so that the next tag activation signal transmitted into the load more closely corresponds to a desired activation signal.
10 Citations
29 Claims
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1. An apparatus for transmitting a signal for activating a tag comprising:
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a transmitter for transmitting a transmission signal in the form of a transmission burst adapted to activate a tag to enable detection thereof; a transmitter controller for providing a transmission waveform, said transmission waveform having a frequency, duty cycle and duration determined for optimal activation and detection of the tag; a receiver for detecting and identifying a responsive signal transmitted by the tag activated by said transmission burst, said receiver including; a signal analysis device for; receiving the transmission signal; analyzing the transmission signal to determine effects of a load as compared with a reference signal; and adjusting the transmitter controller to compensate for the effects of the load on the transmission signal by generating instructions to send an adjusted transmission signal corresponding to the reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 28, 29)
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10. A method of controlling a transmission signal for energizing an EAS tag for detection thereof:
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sending a transmission to a receiver accordance with a waveform having a frequency, duty cycle and duration determined for optimal activation and detection of the tag, wherein said transmission signal will cause the tag to mechanically resonate at a predetermined frequency upon exposure to the transmission signal; and the receiver receiving the transmission signal and analyzing the transmission signal to determine the effects of a load as compared with a reference signal; and compensating for the effects of the load on the transmission signal by generating instructions to send an adjusted transmission signal corresponding to the reference signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 26, 27)
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18. A system for providing an alarm signal by dynamically adjusting an EAS interrogation signal for optimum tag response in varying load conditions, comprising:
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a transmitter controller for providing a transmission waveform; a transceiver for receiving the transmission waveform and providing a transmission signal corresponding to said transmission waveform; an antenna for broadcasting the transmission signal within a range and for receiving a detection signal emitted from a tag energized by the transmission signal from within the range; a plurality of tags for receiving the broadcast transmission signal and providing the corresponding detection signal to the antenna, wherein said detection signal is positive if any of the plurality of tags is within the range and negative if none of the plurality of tags are within the range; a signal analysis device for; receiving the transmission signal, receiving the detection signal, analyzing the transmission signal to determine effects of a load as compared with an ideal activation signal; and adjusting the transmitter controller to compensate for the effects of the load on the transmission signal by sending instructions to the transmitter controller to send an adjusted transmission signal corresponding to the ideal transmission signal. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification