Patent ID: 8848839

Claim:
A data carrier device comprising: receiving means for receiving a modulated carrier signal which contains an encoded data signal encoded in conformity with an encoding method, and said encoded data signal including decoding instruction information; a demodulation means for demodulating the received modulated carrier signal and for outputting the encoded data signal contained therein, decoding means for decoding the encoded data signal and for outputting data, and data processing means for processing the data output by the decoding means, characterized in that the decoding means including at least a first physical decoding stage and a second physical decoding stage, the first decoding stage being arranged to decode said data signal encoded in conformity with a first decoding method whereas the second decoding stage is arranged to decode a data signal encoded in conformity with a second decoding method and wherein said first decoding method is Manchester and the second decoding method is Miller; and wherein said decoding means further includes a decision stage capable of determining which of the first and second stages decodes the encoded data signal.