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AssigneeKasten Chase Applied Research Limited
InventorsChristopher Hook, Keith Juson, Chris Hall, Donald Harold Ferguson, Dimitrie Octavian Paun, Alexandru Oprea
Estimating the term…
The present invention relates to an electronic identification system comprising one or more transponders which store identification and other information in memory, and readers, which capture information from the transponders and write new information thereto, and in which communications between transponders and readers are accomplished using radio frequency signals. The present invention has attributes which make it particularly useful in automatic fare collection systems, where transponders, typically in the form of thin cards and used as pre-paid tickets, are carried by fare paying passengers to replace printed tickets and eliminate exchange of cash. Specifically the system achieves simultaneous identification of numerous transponders by one reader, permits a reader to selectively program any of many transponders under its control, exhibits fast transaction speed to maximize passenger throughput, and achieves exceptional data storage integrity.
In a radio frequency transponder system including an input for receiving a radio frequency signal modulated with data, said data including an error check field, a circuit for demodulating said signal so as to recover said data in serial format, and data memory for storing said data, the improvement comprising a first circuit for receiving said data in serial format and converting said data to parallel format, a second circuit for assessing any errors in said data with reference to said error check field and in the event said data is free of errors then storing said data in parallel format in said memory as a succession of pages each comprising one or more bytes of said data.
A method of transferring data from a reader to at least one transponder in a communication system, comprising the steps of:
In a radio frequency transponder for receiving data from a reader, said data including an address for identifying said transponder from among a plurality of transponders, the improvement comprising a fixed code area in said transponder for storing a unique identification number for said transponder, and logic circuitry for comparing said address included in said data received from said reader with said identification number so as to thereby ascertain whether said data is intended for said transponder from among said of transponders.
In a passive transponder system for receiving a radio frequency signal modulated with programming instruction data from a reader, deriving operating power from said radio frequency signal, demodulating said programming instruction data from said radio frequency signal and in response effecting internal re-programming, the improvement comprising:
In a passive transponder system having an antenna for receiving a radio frequency signal modulated with data a reader, circuitry for deriving operating power from said radio frequency signal, and further circuitry for demodulating said data from said radio frequency signal, the improvement comprising:
A communication system comprising:
Dependencies are inferred from the claim text.