METHOD OF MEASURING FREQUENCY OF COORDINATE INDICATING DEVICE, AND ELECTRIC APPARATUS THEREOF

摘要

An electronic apparatus (200) for measuring a frequency of an electromagnetic signal emitted from a coordinate indicating device contacting a sensor pad, and method are provided. The electronic apparatus (220) includes a signal receiving unit (210) that receives the electromagnetic signal, a band-pass filter unit including a pair of band-pass filters that generates a first filtered signal and a second filtered signal by respectively filtering the electromagnetic signal in a first frequency range and a second frequency range corresponding to a center frequency of the coordinate indicating device, and a controller (230) that acquires a frequency value of the electromagnetic signal based on a ratio value between the first filtered signal and the second filtered signal.