Patent ID: 6791466
Filing Date: 2004-09-14
Classification: H04J,H04L

Abstract:
A method of achieving synchronization in an electronic display system having a communication base station and at least one electronic display module for displaying price or other product information, said method comprising the steps of:(a) designating one preselected bit position in multiple bit messages to be transmitted from said communication base station to said at least one electronic display module with a value of zero; (b) transmitting a plurality of said multiple bit messages in successive frames to said at least one electronic display module, said plurality of messages including guard band partition, address partition, command partition, synchronization partition, message information partition and parity check partition; (c) said at least one electronic display module receiving said multiple bit messages from said communication base station; (d) comparing each bit position in said multiple bit messages received; (e) assigning a value of one if any one of said multiple bit messages has a one in a particular bit position; (f) assigning a value of zero if all of said multiple bit messages has a zero in a particular bit position; (g) adjusting synchronization to position said value of zero in its proper orientation within said multiple bit messages based on the first remaining value of zero; and (h) receiving an up-link message indicating synchronization has been achieved using a continuous wave tone.