Portable electronic apparatus, IC card and reader/writer
AssigneeSony Corporation
InventorsYuji Murayama, Shigeru Arisawa
Life of this patent
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Abstract
A portable electronic apparatus is disclosed which comprises a detecting element for detecting a high-frequency signal received by an antenna and for outputting the detected signal, a sampling element for sampling the detected signal with regard to a frequency higher than a clock frequency of the detected signal and for outputting sampled results, and a decoding element for decoding data transmitted by the high-frequency signal by use of the signal level distribution of the detected signal derived from the sampled results.
Claims25
A portable electronic apparatus comprising:
- a clock generation circuit, said clock generation using a received signal to generate a clock signal and a sampling signal,
- received data being the information transmitted to said portable electronic apparatus by way of said received signal,
- said sampling signal having a plurality of pulses during each cycle of said clock signal,
- a plurality of logic levels being generated during said each cycle of said clock signal,
- a logic level of said plurality of logic levels being the signal level of said received signal when sampled by a pulse of said plurality of pulses;
- and
- a decoder, said decoder decoding said plurality of logic levels to generate said received data.
An IC card for receiving data transmitted by a reader/writer and for outputting data from an internal memory in return, said IC card comprising:
- a clock generation circuit, said clock generation circuit using a received signal to generate a clock signal and a sampling signal,
- received data being the information transmitted to said IC card by way of said received signal,
- said sampling signal having a plurality of pulses during each cycle of said clock signal,
- a plurality of logic levels being generated during said each cycle of said clock signal,
- a logic level of said plurality of logic levels being the signal level of said received signal when sampled by a pulse of said plurality of pulses;
- and
- a decoder, said decoder decoding said plurality of logic levels to generate said received data.
A reader/writer for receiving data transmitted by an IC card, said reader/writer comprising:
- a clock generation circuit, said clock generation circuit using a received signal to generate a clock signal and a sampling signal,
- received data being the information transmitted to said reader/writer by way of said received signal,
- said sampling signal having a plurality of pulses during each cycle of said clock signal,
- a plurality of logic levels being generated during said each cycle of said clock signal,
- a logic level of said plurality of logic levels being the signal level of said received signal when sampled by a pulse of said plurality of pulses;
- and
- a decoder, said decoder decoding said plurality of logic levels to generate said received data.
A portable electronic apparatus comprising:
- a clock generation circuit, said clock generation circuit using a received signal to generate a clock signal,
- received data being the information transmitted to said portable electronic apparatus by way of said received signal;
- and
- a correlation value detection circuit, said correlation value detection circuit comparing the phase of said clock signal to the phase of said received signal to generate a correlation value signal,
- said correlation value signal trending in a first direction when sail clock signal is in phase with said received signal and trending in a direction opposite to said first direction when said clock signal is out of phase with said received signal;
- a determination circuit, said determination circuit using said correlation value signal to generate said received data.
An IC card for receiving data transmitted by a reader/writer and for outputting data from an internal memory in return, said IC card comprising:
- a clock generation circuit, said clock generation circuit using a received signal to generate a clock signal,
- received data being the information transmitted to said IC card by way of said received signal;
- and
- a correlation value detection circuit, said correlation value detection circuit comparing the phase of said clock signal to the phase of said received signal to generate a correlation value signal,
- said correlation value signal trending in a first direction when said clock signal is in phase with said received signal and trending in a direction opposite to said first direction when said clock signal is out of phase with said received signal;
- a determination circuit, said determination circuit using said correlation value signal to generate said received data.
A reader/writer for receiving data transmitted by an IC card, said reader/writer comprising:
- a clock generation circuit, said clock generation circuit using a received signal to generate a clock signal,
- received data being the information transmitted to said reader/writer by way of said received signal;
- and
- a correlation value detection circuit, said correlation value detection circuit comparing the phase of said clock signal to the phase of said received signal to generate a correlation value signal,
- said correlation value signal trending in a first direction when said clock signal is in phase with said received signal and trending in a direction opposite to said first direction when said clock signal is out of phase with said received signal;
- a determination circuit, said determination circuit using said correlation value signal to generate said received data.
Dependencies are inferred from the claim text.