Transponder unit
First Claim
Patent Images
1. A transponder for transferring data to a reading device using an electromagnetic field, comprising:
- a receiver arranged to receive a clock signal emitted by the 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 a 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,wherein the device restricting the data block size of the data is configured to restrict the data block size to the following data block size ByteMaxBlock dependent on the frequency difference;
ByteMaxBlock≦
[Δ
Pulsemax·
fc]/[||·
BitByte·
PulseBit],
(1)where ByteMaxBlock is the data block size in bytes per data block, fc is the frequency generator frequency, is the frequency difference between the clock frequency and the frequency generator frequency, BitByte is the number of bits per byte, PulseBit is the number of pulses of the frequency generator signal per bit, and Δ
Pulsemax is a constant which is smaller than PulseBit/2 or PulseBit/4 or smaller than or equal to PulseBit/8.
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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.
8 Citations
5 Claims
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1. 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 the 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 a 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, wherein the device restricting the data block size of the data is configured to restrict the data block size to the following data block size ByteMaxBlock dependent on the frequency difference;
ByteMaxBlock≦
[Δ
Pulsemax·
fc]/[||·
BitByte·
PulseBit],
(1)where ByteMaxBlock is the data block size in bytes per data block, fc is the frequency generator frequency, is the frequency difference between the clock frequency and the frequency generator frequency, BitByte is the number of bits per byte, PulseBit is the number of pulses of the frequency generator signal per bit, and Δ
Pulsemax is a constant which is smaller than PulseBit/2 or PulseBit/4 or smaller than or equal to PulseBit/8.- View Dependent Claims (2)
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3. A system for data transfer, comprising:
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at least one transponder for transferring data to a reading device using an electromagnetic field, comprising; a receiver arranged to receive a clock signal emitted by the 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 a 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, wherein the device restricting the data block size of the data is configured to restrict the data block size to the following data block size ByteMaxBlock dependent on the frequency difference;
ByteMaxBlock≦
[Δ
Pulsemax·
fc]/[||·
BitByte·
PulseBit],
(1)where ByteMaxBlock is the data block size in bytes per data block, fcis the frequency generator frequency, is the frequency difference between the clock frequency and the frequency generator frequency, BitByte is the number of bits per byte, PulseBit is the number of pulses of the frequency generator signal per bit, and Δ
Pulsemax is a constant which is smaller than PulseBit/2 or PulseBit/4 or smaller than or equal to PulseBit/8; anda reading device which is configured to communicate with the transponder.
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4. 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 a 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, wherein the data block size is restricted to the following data block size ByteMaxBlock dependent on the frequency difference;
ByteMaxBlock≦
[Δ
Pulsemax·
fc]/[||·
BitByte·
PulseBit],where ByteMaxBlock is the data block size in bytes per data block, fc is the frequency generator frequency, is the frequency difference between the clock frequency and the frequency generator frequency, BitByte is the number of bits per byte, PulseBit is the number of pulses of the frequency generator signal (141, 142, 143, 144, 145) per bit, and Δ
Pulsemax is a constant which is smaller than PulseBit/2 or PulseBit/4 or smaller than or equal to PulseBit/8.- View Dependent Claims (5)
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Specification