TRANSPONDER UNIT
2 Assignments
0 Petitions
Accused Products
Abstract
A transponder unit for transferring data to a reading device by modulation of an electromagnetic field includes a device for varying the data block size of the data by restricting the same or by modifying a clock signal, in dependence on a frequency difference between a clock frequency of a clock signal transferred from the reading device to the transponder unit, and a frequency generator frequency of a frequency generator of the transponder unit.
7 Citations
30 Claims
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1-15. -15. (canceled)
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16. A transponder for transferring data to a reading device using an electromagnetic field, comprising:
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a receiver arranged to receive a clock signal emitted by a reading device at a clock frequency; a frequency generator configured to generate a frequency generator frequency which is employed for clocking transfer of the data; a frequency comparator which is configured to determine the frequency difference between the clock frequency and the frequency generator frequency; and a device arranged to restrict the data block size of the data to a data block size dependent on the frequency difference. - View Dependent Claims (17, 22, 23)
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18. A transponder for transferring data to a reading device by an electromagnetic field, comprising:
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a receiver arranged to receive a clock signal emitted by a reading device at a clock frequency; a frequency generator configured to generate a frequency generator signal at a frequency generator frequency, said signal comprising pulses clocked at the frequency generator frequency and used to clock the transfer of data; a frequency comparator which is configured to determine the frequency difference between the clock frequency and the frequency generator frequency; and a device arranged to modify the frequency generator signal by generating additional pulses or removing pulses in dependence on the frequency difference. - View Dependent Claims (19, 20, 21)
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24. A method for transferring data from a transponder unit to a reading device by using an electromagnetic field, comprising the following steps:
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receiving a clock signal emitted by a reading device, at a clock frequency; generating a frequency generator frequency in the transponder unit; determining the frequency difference between the clock frequency and the frequency generator frequency; transferring data from the transponder unit to the reading device by means of an electromagnetic field employing the frequency generator frequency; and restricting the data block size of the data to be transferred to a data block size dependent on the frequency difference. - View Dependent Claims (25, 30)
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26. A method for transferring data from a transponder unit to a reading device by using of an electromagnetic field, comprising the following steps:
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receiving a clock signal emitted by a reading device at a clock frequency; generating a frequency generator signal at a frequency generator frequency, said signal comprising pulses clocked at the frequency generator frequency; determining the frequency difference between the clock frequency and the frequency generator frequency; transferring data to the reading device by using an electromagnetic field; and modifying the frequency generator signal by generating additional pulses or removing pulses in dependence on the frequency difference, so that the transfer of the data to the reading device by means of the electromagnetic field is effected using the modified frequency generator signal. - View Dependent Claims (27, 28, 29)
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Specification