Patent ID: 9154650
Filing Date: 2015-10-06
Classification: G06K,H04N

Abstract:
1. A method for reading data from a document with the aid of a reading device, wherein the primary side of a transformer is formed by the reading device, wherein the document has an electronic memory for storing the data, a processor for reading the data from the memory, and at least one electrical load actuatable by the processor, wherein the secondary side of the transformer is formed by the document, and wherein the processor and the at least one load are coupled to the secondary side for energy supply, said method comprising: applying a primary-side voltage to the primary side to couple energy into the secondary side; actuating the at least one load via the processor, whereby a secondary-side load that varies over time is formed, as a result of which the primary side experiences a modulation; and evaluating the modulation of the primary side by the reading device so as to execute a read access for the purpose of reading the data, according to a result of the evaluation, wherein evaluating the modulation of the primary side comprises demodulating the modulated primary-side voltage, the modulated primary-side current, or the modulated primary-side complex impedance so as to receive a first piece of information from the document, and wherein reading the data is executed dependent on the first piece of information.