Process for transmitting data between a read/write device and a

Details Process for transmitting data between a read/write device and a Process for transmitting data between a read/write device and a

1998-10-16

2000-11-14

Zimmerman, Brian

Communications: electrical

Selective

Interrogation response

340 102, 340 1034, 34082534, 702 38, 702 57, 702 64, 702106, 342100, 342174, 341120, H04Q 522

Patent

active

061475912

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.

REFERENCES:
patent: 4206421 (1980-06-01), Bernhard et al.
patent: 5105190 (1992-04-01), Kip et al.
patent: 5124699 (1992-06-01), Tervoert et al.
patent: 5491471 (1996-02-01), Stobbe

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