| 摘要 |
When an excitation frequency of a touch panel is coincident with or in the vicinity of a frequency of external noise, noise cannot be removed by a bandpass filter. Also when a touch detecting operation period is limited to a short period of time such as a non-address period, frequency resolution is reduced and a noise removal effect of averaging is reduced, so that an S/N ratio is decreased. The electronic apparatus of the present invention includes a sensor system 101, an excitation generating unit 102 which generates an intermittent sine wave signal and applies the same to the sensor system, and a demodulation unit 105 which demodulates an amplitude modulated signal which is an output of the sensor system, in which the demodulation unit generates a demodulated signal D(t) using both a response x1(t) of the sensor system in a period when the excitation generating unit outputs a sine wave and a response z1(t) of the sensor system in a period, at least either immediately before or immediately after the above-mentioned period, when the excitation generating unit does not output a sine wave. |
