Synchronous Detection Using Dither Correction and Weighted Averaging
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Solution Overview
Problem
In actual feedback systems, noise superimposed on the output from the controlled object and circuit noise affect the accuracy of synchronization detection, leading to a trade-off between accuracy and processing time, making it difficult to reduce processing time while maintaining certain accuracy in synchronization detection.
Innovation Solution
A synchronization detection device that corrects sampled data based on a dither signal period, multiplies it by weight coefficients associated with the reference signal timing, and averages the results to enhance the dither component relative to noise, thereby improving the signal-to-noise ratio and reducing processing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional synchronization detection is used to maintain accuracy in noisy environments, then measurement precision is improved, but processing time increases
Solution Approach 1:
The patent segments the detection process into multiple stages: first performing correction processing on sampled data using reference signal levels, then performing multiplication processing with weight coefficients, and finally performing integration processing. This segmentation allows each processing stage to be optimized independently, achieving high accuracy with reduced processing time by eliminating unnecessary computation steps.
Solution Approach 2:
The patent performs correction processing as a preliminary step before multiplication and integration. The correction unit corrects sampled data based on reference signal levels in advance, which prepares the data for more efficient subsequent processing. This preliminary action ensures that the main detection algorithm receives pre-processed data, reducing the computational burden and processing time while maintaining accuracy.
2Productivity
If processing time is reduced to improve productivity, then throughput increases, but measurement precision deteriorates
Solution Approach 1:
The patent changes the processing parameters by introducing specific weight coefficients for different levels of the reference signal and using correction values based on reference signal levels. These parameter changes enable the system to achieve accurate synchronization detection with fewer processing steps, thereby improving detection speed without sacrificing precision. The weight coefficients are specifically designed to maximize the detection accuracy while minimizing computation time.
3Measurement precision
If correction processing is performed for each period of reference signal, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The correction unit performs correction processing that serves multiple functions: it corrects sampled data based on reference signal levels, prepares data for multiplication processing, and enhances the dither component while suppressing noise. This multi-functionality allows a single processing stage to achieve multiple objectives, improving dither component detection accuracy without proportionally increasing device complexity.
Data Source
AI summary
A synchronization detection device includes: a correction unit configured to correct sampled data of a waveform on which a dither signal is superimposed, for each period of a reference signal in accordance with a period of the dither signal; a multiplication unit configured to multiply the corrected sampled data by a weight coefficient that is different for each level of the reference signal and associated with a timing of the reference signal; and an averaging unit configured to derive, as a detection result, an average of a result of the multiplication of the corrected sampled data by the weight coefficient.