CPC G01P 15/097 (2013.01) [G01C 19/5783 (2013.01); G01P 1/023 (2013.01); H03M 3/378 (2013.01); G01D 1/16 (2013.01); H03M 3/30 (2013.01)] | 11 Claims |
1. A vibration rectification error correction device comprising:
a reference signal generation circuit that outputs a reference signal;
a frequency delta-sigma modulation circuit that performs frequency delta-sigma modulation on the reference signal by using a measured signal to generate a frequency delta-sigma modulated signal;
a first filter that operates in synchronization with the measured signal; and
a second filter that operates in synchronization with the reference signal, wherein
the first filter generates a third signal based on a first signal having a first group delay amount based on the frequency delta-sigma modulated signal and a second signal having a second group delay amount different from the first group delay amount based on the frequency delta-sigma modulated signal,
the second filter receives a signal based on the third signal and outputs a fourth signal, and
a first vibration rectification error included in a fifth signal output from the second filter when the first signal is input to the second filter and a second vibration rectification error included in a sixth signal output from the second filter when the second signal is input to the second filter have different polarities.
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