Synchronous detection method and device, and sensor signal detector

Abstract

The present invention is intended to efficiently minimize high-frequency noise stemming from synchronous detection without the necessity of a low-pass filter that requires a large time constant. A vibratory gyroscope includes a synchronous detection unit that detects a sense signal sent from a sensing element using a reference signal synchronous with a monitor signal. In the vibratory gyroscope, an analog moving-average filter that produces a moving average of the detection signal by sampling the detection signal during one cycle of the reference signal is used to remove high-frequency noise components from the detection signal, which is detected to be synchronous with the reference signal, without the necessity of a CR filter that requires a large time constant. Consequently, unnecessary noise components whose frequencies are equal to the frequency of the reference signal and those of its harmonics, and which stem from synchronous detection, can be efficiently attenuated owing to an infinite attenuation frequency band offered by the analog moving-average filter.

Dependencies are inferred from the claim text.