Appeal No. 2002-1194
Application No. 08/534,808
link burst and up-link communication are chosen such that the
display system has an opportunity to “sleep” for most of the
duration of a frame and “wakes up” in time to receive the next
frame with its local clock still synchronized (specification
pages 16 and 17).
Representative independent claim 1 is reproduced below:
1. 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;
2
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