| 摘要 |
A data sampling circuit and a data sampling method for performing sampling at a frequency lower than a carrier frequency. An infrared communication signal converted to an electric signal is input to a data sampling circuit, and a signal in a band lower than or equal to the carrier signal frequency is extracted by an LPF. After the communication signal is input from the LPF, a detection information retention block specifies detection information indicating that the communication signal has been detected and retains the detection information. The detection information in a previous sampling cycle and the detection information in the current sampling cycle are compared to determine whether the communication signal has been input. A measurement block measures a period in which the input of the communication signal continues or a period in which the communication signal is not input, in accordance with the detection result.
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