Patent ID: 9529473
Filing Date: 2016-12-27
CPC Classification: G06F,H03K

Claim Text:
1. An electronic apparatus comprising: a sensor system; an excitation generating unit which generates an intermittent sine wave signal and applies the intermittent sine wave signal to the sensor system; and a demodulating unit which demodulates an amplitude modulated signal which is an output of the sensor system, wherein the demodulating unit generates a demodulated signal using both a response of the sensor system in a period when the excitation generating unit outputs a sine wave and a response of the sensor system in a period, at least either immediately before or immediately after the aforementioned period, when the excitation generating unit does not output a sine wave, and wherein with a vector as X, which is obtained from an amplitude and a phase, the amplitude and the phase being calculated from the response of the sensor system in a period in which the excitation generating unit has output the sine wave, by extracting a frequency component of the sine wave from the response of the sensor system, and with vectors as Y and Z, which are obtained from an amplitude and a phase, the amplitude and the phase being respectively calculated from the response of the sensor system in periods, immediately before and immediately after the aforementioned period, when the excitation generating unit does not output the sine wave, by extracting a frequency component of the sine wave from the response of the sensor system, the demodulated signal corresponds to a constant multiplication of |X−k·M| in which M represents a mean vector of Y and Z, and k represents a coefficient whose value is determined using a response of the sensor system in a period when the excitation generating unit does not output the sine wave.