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Antaloli Stobbe

Hartmut Scheffler

Anatoli Stobbe

A security system includes a base station and at least one transponder. A data dialogue takes place between the base station and the transponder in which the transponder sends back data to the base station on a carrier frequency in the RF (radio frequency) range. The transponder comprises a first transmitter and a second transmitter for data transmission to the base station and/or to a read/write device. The second transmitter sends on an electromagnetic carrier frequency in the LF (low frequency) range, and an audible carrier frequency in the ultrasonic range or an optical carrier frequency in the infrared range.

Security system, transponder and receiver device

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.

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

The invention relates to a device and process for data transmission. The data is transmitted by changes in the field strength of an electromagnetic or magnetic field, and then the times between at least two sequential field strength changes are evaluated. A frequency serving as the time base for evaluating the times between the field strength changes is calibrated at least at the beginning of data transmission so that it has a set relationship to the cycle duration of the field strength changes.

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Bad Nenndorf, Germany

Hartmut Scheffler