EP 0972265 A1 20000119 - TRANSACTION SYSTEM
Title (en)
TRANSACTION SYSTEM
Title (de)
TRANSAKTIONSSYSTEM
Title (fr)
SYSTEME DE TRANSACTION
Publication
Application
Priority
- GB 9900239 W 19990122
- GB 9801439 A 19980124
Abstract (en)
[origin: GB2333665A] A transaction system comprises a terminal and a contact less token which communicate over an inductive coupling. Power and data are transmitted by the terminal to the token by a carrier signal. The token modulates the carrier signal by drawing more power from the signal. Data receiving means receives a first and second carrier signal, the first carrier signal being a version of the original carrier phase shifted 58 by +X‹ and the second carrier signal being a version of the original carrier shifted 60 by (X+ 180)‹. The first carrier is transmitted by the terminal and a signal containing the first carrier and the modulated signal from the token and the second carrier are summed 68 to produce a data signal. The token may be a smart card.
IPC 1-7
IPC 8 full level
G06K 7/00 (2006.01)
CPC (source: EP)
G06K 7/0008 (2013.01)
Citation (search report)
See references of WO 9938106A1
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
GB 2333665 A 19990728; GB 2333665 B 20001129; GB 9801439 D0 19980318; AU 2179199 A 19990809; EP 0972265 A1 20000119; WO 9938106 A1 19990729
DOCDB simple family (application)
GB 9801439 A 19980124; AU 2179199 A 19990122; EP 99901794 A 19990122; GB 9900239 W 19990122