Position detector, integrated circuit, and position detection method

Abstract

A position detector includes a plurality of electrodes that, in operation, functions as a sensor and that includes a transfer coil that, in operation, transfers an alternating magnetic field to a position indicator based on a transfer signal; and a signal processing circuit connected to the electrodes. The signal processing circuit, in operation, detects a pen signal generated by the position indicator; obtains, based on the pen signal, first frequency information that includes frequency information of the pen signal; compares the first frequency information and second frequency information that is stored in a memory; generates the transfer signal with a frequency that is based on the frequency information of the pen signal if the first frequency information is determined to have changed based on the second frequency information that is stored in the memory; and transfers the transfer signal to the transfer coil.

Dependencies are inferred from the claim text.