Patent ID: 7424977
Filing Date: 2008-09-16
Classification: G01R,G06K,G06Q,G07F

Abstract:
1. A system of contactless payment devices such as card and reader devices, wherein in operation of the devices, the reader devices transmit signals which are received by counterpart card devices, and the card devices transmit signals which are received by counterpart reader devices, the system comprising: a specification range Rtx of a parameter related to a signal transmitted by the device, wherein each device is specified to transmit a signal whose parameter value C is in the range Rtx: a specification range Rrx of parameter values of the signal received by the counterpart devices, wherein each counterpart device is specified to operate properly when the received signal parameter has any value in the range Rrx, and wherein the specification range Rtx is a subset of the specification range Rrx so that parameter value C is in the range Rrx and therefore the counterpart device can operate properly in response to the signal transmitted by any device; a reference device and a reference counterpart device; a specification verification that each counterpart device operates properly when the received signal parameter has any value in the range Rrx by using the reference device to generate and transmit different signals having parameter values across the range Rrx.