Importance

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Abstract

To improve the S/N ratio of a pen signal received in a sensor controller, without decreasing the frequency of position detection or increasing the circuit scale of the sensor controller, a method according to the present invention is executed by a sensor controller of an electromagnetic resonance system, and in each of a plurality of pen signal detection periods Tl to T3, three loop coils LCx_n−1 to LCx_n+1 are connected in connection modes having different connection polarities for each pen signal detection period, a result value indicating a level of a pen signal is detected via the three loop coils LCx_n−1 to LCx_n+1, and the level of the pen signal corresponding to each of the three loop coils LCx_n-1 to LCx_n+1 is separately acquired by performing a restoration operation according to the connection polarities on a plurality of the result values detected in the respective pen signal detection periods.

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First Claim