Patent ID: 6595414
Filing Date: 2003-07-22
Classification: G06K

Abstract:
A data carrier comprising:receiving means for receiving an amplitude-modulated carrier signal which is amplitude-modulated in dependence on data to be received and which comprises a high interval of high amplitude and a pause interval of reduced amplitude; power generating means coupled to the receiving means and configured to generate d.c. power from the received carrier signal, which power generating means include storage means for storing the generated d.c. power; pause detection means coupled to the receiving means and configured to detect the pause interval and to generate from the received carrier signal an identification signal upon detection of the pause interval, the identification signal being a logic gating signal; clock signal generating means coupled to the receiving means and configured to generate a clock signal from the received carrier signal; data processing means configured to receive the d.c. power and the clock signal which data processing means is configured to process the data modulated on the received carrier signal and has an idle power consumption when no clock signal is applied to the data processing means and an operating power consumption higher than the idle power consumption when a clock signal is applied to the data processing means; and control means, which include the pause detection means and which upon detection of the pause interval cause the application of the clock signal to the data processing means to be inhibited in dependence of the identification signal.