Process for transmitting data between a read/write device and a transponder
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United States of America Patent
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-
Nov 14, 2000
Grant Date -
N/A
app pub date -
Oct 16, 1998
filing date -
Jul 18, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention is a process to transmit data between a read/write device and a transponder. The data is transmitted by a change in field strength of an electromagnetic or magnetic field, and the times between sequential field strength changes are evaluated. At least at the beginning of data transmission, the systematic time deviation from the setpoint is determined that arises upon a switching threshold in the field strength changes. A correction value is derived, and the subsequently determined times are changed by the correction value. This correction allows for a greater amount of data to be transferred from the read/write device to the transponder.
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