Process for transmitting data between a read/write device and a transponder
AssigneeAnatoli Stobbe
InventorsAnatoli Stobbe, Hartmut Scheffler
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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.
Claims8
A process for transmitting data between a read/write device and a transponder, comprising the steps of:
- a) transmitting a data signal from a read/write device to a transponder via an electromagnetic field;
- b) changing the field strength of the electromagnetic field;
- c) evaluating the times between sequential field strength changes;
- d) determining a systematic time deviation from a setpoint that arises when a switching threshold of the field strength change is passed through, thereby obtaining a correction value;
- and
- e) detecting times that are changed by said correction value.
Dependencies are inferred from the claim text.