Method and device for transmission of data in an electronic shelf labeling system
First Claim
1. A method for creating synchronized transmission of messages in a wireless electronic shelf labeling system comprising at least two transmitters, a plurality of receiving label-units and a central processing unit capable of issuing messages to be transmitted via said transmitters, the method comprising determining, for each transmitter, the signal delay between issuing of a message at the central processing unit and transmission of the message from the transmitter;
- actively delaying, in response to said determined signal delay, transmission from the individual transmitters such that synchronized transmission from all transmitters is achieved, wherein the step of determining the signal delay comprises setting the transmitters in a mirror-mode so that they automatically mirror all received pulses back to the central processing unit and measuring the time-difference between sending and receiving the same pulse.
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Abstract
A method for creating synchronized transmission of messages in a wireless electronic shelf labeling system comprising at least two transmitters, a plurality of receiving label-units and a central processing unit capable of issuing messages to be transmitted via said transmitters. Wherein a first step involves determining, for each transmitter, the signal delay between issuing of a message at the central processing unit and transmission of the message from the transmitter. Wherein a second step involves actively delaying, in response to said determined signal delay, transmission from the individual transmitters such that synchronized transmission from all transmitters is achieved. The present invention further relates to a wireless electronic shelf labeling system and a transmitter for such a system.
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Citations
13 Claims
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1. A method for creating synchronized transmission of messages in a wireless electronic shelf labeling system comprising at least two transmitters, a plurality of receiving label-units and a central processing unit capable of issuing messages to be transmitted via said transmitters, the method comprising determining, for each transmitter, the signal delay between issuing of a message at the central processing unit and transmission of the message from the transmitter;
- actively delaying, in response to said determined signal delay, transmission from the individual transmitters such that synchronized transmission from all transmitters is achieved, wherein the step of determining the signal delay comprises setting the transmitters in a mirror-mode so that they automatically mirror all received pulses back to the central processing unit and measuring the time-difference between sending and receiving the same pulse.
- View Dependent Claims (2, 3, 4, 5)
- 6. A transmitter for a wireless electronic shelf labeling system, wherein the transmitter comprises an active signal delay unit that is arranged to delay transmission from said transmitter, and is adjustable in correspondence with an active signal delay parameter, wherein the transmitter is arranged to be set in a mirror-mode so that it automatically mirrors all received pulses back for measuring the time-difference between sending and receiving the same pulse.
- 8. A wireless electronic shelf labeling system comprising at least two transmitters, a plurality of receiving label-units and a central processing unit capable of issuing messages to be transmitted via said transmitters, wherein the system comprises one or more active signal delay units that are arranged to delay transmission from said transmitters, and adjustable in correspondence with an active signal delay parameter, wherein the at least two transmitters are arranged to be set in a mirror-mode so that they automatically mirror all received pulses back for measuring the time-difference between sending and receiving the same pulse.
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13. A method for creating synchronized transmission of messages in a wireless electronic shelf labeling system comprising at least two transmitters, a plurality of receiving label-units and a central processing unit capable of issuing messages to be transmitted via said transmitters, the method comprising determining, for each transmitter, the signal delay between issuing of a message at the central processing unit and transmission of the message from the transmitter;
- actively delaying, in response to said determined signal delay, transmission from the individual transmitters such that synchronized transmission from the at least two transmitters is achieved.
Specification