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

A sensor controller connected to:

• a plurality of linear electrodes that are formed to extend in a first direction and are arranged side by side in a second direction different from the first direction;
• and
• a plurality of coils that are formed to extend in the second direction and are arranged side by side in the first direction;
• wherein the sensor controller is configured to:
• in a first half of each of a plurality of pen signal detection periods, send an alternating magnetic field by supplying a first alternating current to one or more of the plurality of linear electrodes and by supplying a second alternating current different from the first alternating current to one or more others of the plurality of linear electrodes;
• and
• in a second half of each of the plurality of pen signal detection periods, connect a defined number of two or more coils selected from the plurality of coils in connection modes having different connection polarities in the plurality of pen signal detection periods and detect a result value indicating a level of a pen signal via the defined number of two or more coils;
• and separately acquire the level of the pen signal corresponding to each of the defined number of two or more coils by performing a restoration operation according to the connection polarities on a plurality of the result values detected in the plurality of pen signal detection periods.

A method of receiving a pen signal from a pen using:

• a plurality of linear electrodes that are formed to extend in a first direction and are arranged side by side in a second direction different from the first direction;
• and
• a plurality of coils that are formed to extend in the second direction and are arranged side by side in the first direction;
• wherein the method comprises:
• in a first half of each of a plurality of pen signal detection periods, sending an alternating magnetic field by supplying a first alternating current to one or more of the plurality of linear electrodes and by supplying a second alternating current different from the first alternating current to one or more others of the plurality of linear electrodes;
• and
• in a second half of each of the plurality of pen signal detection periods, connecting a defined number of two or more coils selected from the plurality of coils in connection modes having different connection polarities in the plurality of pen signal detection periods and detecting a result value indicating a level of a pen signal via the defined number of two or more coils;
• and separately acquiring the level of the pen signal corresponding to each of the defined number of two or more coils by performing a restoration operation according to the connection polarities on a plurality of the result values detected in the plurality of pen signal detection periods.