Electronic placard

摘要

A system for displaying updated traffic information such as parking, detours, road blockage etc. in a given area. The system comprises a network of placards connected to a central station. Each placard has a unique identification within the network. The central station sends a message word to one of more placards and each placard receives and propagates the received message word to adjacent placards in the network in a point-to-multipoint configuration. The message word includes an encoded traffic message that only the designated placards may decode and display. In an embodiment, the encoded message may only be decoded using the unique identification of the designated placards.

主权项

1. An electronic placard comprising:
a display; a memory having recoded thereon an address representing a unique identification of the electronic placard in a network of placards; a transceiver adapted to receive a message word including an encoded traffic message from a central station over said network of electronic placards and wirelessly propagate the received message word to adjacent electronic placards in a point-to-multipoint configuration; and a controller adapted to attempt decoding the message word using the unique identification to extract the traffic message, and if successfully extracted send the extracted traffic message to the display for overriding the traffic message previously displayed on the display;whereby only designated electronic placards may decode the message word to display it;wherein the electronic placard is adapted to:
detect a remote controller within a predetermined short distance and detect an ID of the remote controller; receive message words from the remote controller, extract the traffic message from the received message words and display the traffic messages on the display; decode any message word sent by the remote controller regardless of the unique identifier of each electronic placard.