Method executed by sensor controller of electromagnetic resonance system, sensor controller, and position detection device

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 Tto T, three loop coils LCxto LCxare 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 LCxto LCx, and the level of the pen signal corresponding to each of the three loop coils LCxto LCxis 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.