Wacom Co., Ltd.

Paiching Hsiao

Yoshio Nomura

Yuhi Hatano

Provided is a sensor controller that controls an operation of a touch sensor that detects a position of a passive pointer. The sensor controller includes a transmission circuit transmitting a transmission signal in a third period at a predetermined cycle, the third period including a first period and a second period, a processor that measures a level of electromagnetic noise at a frequency associated with each period in the first period and the second period, and that selects, as a scan frequency of the transmission signal in the second period, one of a first predetermined number of frequencies and selects, as backup frequencies of the transmission signal in the first period, a second predetermined number of frequencies fewer than the first predetermined number of frequencies different from the scan frequency, in each third period and according to a measurement result.

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Saitama, Japan

Paiching Hsiao