Phase-Shifted Signal Processing for Accurate Periodic Signal Extraction
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Solution Overview
Problem
Existing signal processing methods for synchronous addition of repetitive waveforms fail to accurately extract desired signal components due to waveform components not synchronized with the synchronous addition timing, leading to unnecessary reduction of correlated components, and require complex smoothing processing to select appropriate cutoff frequencies.
Innovation Solution
A signal processing method that generates a processing target signal and calculates vibration rectification errors through product-sum operations on phase-shifted signals, allowing for the adjustment of shift amounts to minimize errors and improve signal extraction without the need for envelope processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If synchronous addition is used to reduce asynchronous components, then noise reduction is achieved, but correlated waveform components that are not synchronized with the timing are also reduced
Solution Approach 1:
The patent dynamically adjusts the phase shift amount applied to the reference signal based on the detected phase difference between the measurement signal and reference signal. This dynamic phase adjustment ensures that the synchronous addition process captures correlated waveform components at their correct phase positions, preventing loss of information while maintaining noise reduction effectiveness.
Solution Approach 2:
The patent changes the phase parameter of the reference signal by applying a variable phase shift amount that is determined from the phase difference detection. This parameter change allows the system to adapt to varying signal conditions and maintain accurate extraction of correlated components without unnecessarily reducing valid signal information.
2Measurement precision
If envelope processing with smoothing filter is used to extract desired signal components, then signal extraction accuracy is improved, but calculation complexity increases
Solution Approach 1:
The patent extracts only the essential phase difference information from the measurement signal and uses this extracted parameter to adjust the reference signal phase. This selective extraction approach avoids the need for complex envelope processing and smoothing operations, reducing calculation complexity while maintaining the ability to accurately extract desired signal components.
Solution Approach 2:
The patent performs preliminary phase difference detection and calculates the required phase shift amount before performing the synchronous addition operation. This preliminary action ensures that the reference signal is properly aligned with the measurement signal, enabling accurate signal extraction through simpler operations rather than requiring complex post-processing with smoothing filters.
Data Source
AI summary
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.