Contactless Communications Method Based On Asynchronous Modulations And Demodulations
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United States of America Patent
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Issued Date -
Sep 4, 2008
app pub date -
Apr 10, 2006
filing date -
Apr 12, 2005
priority date (Note) -
Abandoned
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Abstract
The invention relates to a method for exchanging information by inductive coupling or without contact between a reader (2) and a transponder (4), comprising a number of demodulation steps, by the transponder, of a transmission signal coming from the reader, each demodulation step being associated with: a detection of a jump of a parameter of the transmission signal, of a first state to a second state among a set of stable states that the parameter of the transmission signal is capable of adopting; a comparison of the magnitude of the jump and/or of the direction of the jump, at one or more predetermined threshold values; an association with the magnitude of the jump and/or with the direction of the jump, at a value independent of the first state, and; a detection of a stabilization at the second state before another demodulation. The invention also relates to a device for carrying out said method.
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