Signal processing method, signal processing device, physical quantity measurement device, and sensor module
AssigneeSeiko Epson Corporation
InventorMasayoshi Todorokihara
Life of this patent
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Abstract
A signal processing method includes a processing target signal generation step of generating a processing target signal which is a time-series signal based on a source signal which is a time-series signal output from an object, and a vibration rectification error calculation step of calculating a plurality of vibration rectification errors by performing product-sum operation processing of a first signal based on the processing target signal and a second signal based on a phase-shifted signal of the processing target signal a plurality of times by changing a shift amount.
Claims11
A signal processing method comprising:
- a processing target signal generation step of generating a processing target signal which is a time-series signal based on a source signal which is a time-series signal output from an object;
- a vibration rectification error calculation step of calculating a plurality of vibration rectification errors by performing product-sum operation processing of a first signal based on the processing target signal and a second signal based on a phase-shifted signal of the processing target signal a plurality of times by changing a group delay amount of a low-pass filter;
- a resonance frequency calculation step of calculating a resonance frequency of the object based on the plurality of vibration rectification errors;
- and
- a determination step of determining whether the calculated resonance frequency is correct or not based on a difference between a maximum value and a minimum value of the plurality of vibration rectification errors.
A signal processing device comprising:
- a processing target signal generation circuit configured to generate a processing target signal which is a time-series signal based on a source signal which is a time-series signal output from an object;
- a vibration rectification error calculation circuit configured to generate a plurality of vibration rectification errors by performing product-sum operation processing of a first signal based on the processing target signal and a second signal based on a phase-shifted signal of the processing target signal a plurality of times by changing a group delay amount of a low-pass filter;
- a resonance frequency calculation circuit configured to calculate a resonance frequency of the object based on the plurality of vibration rectification errors;
- and
- a determination circuit configured to determine whether the calculated resonance frequency is correct or not based on a difference between a maximum value and a minimum value of the plurality of vibration rectification errors.
Dependencies are inferred from the claim text.