Physical Quantity Detection Circuit Noise Reduction
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Solution Overview
Problem
Physical quantity detectors face challenges in maintaining detection accuracy and reliability under noisy environments, particularly when the downstream sampling rate is lower than the detector's sampling rate, leading to noise contamination in output data.
Innovation Solution
A physical quantity detection circuit that performs average processing on data to reduce noise, where the calculation processing unit generates calculation data at a lower rate than the digitalization sampling rate, optimizing the number of data points to be averaged based on the downstream sampling rate, and incorporating noise reduction through offset and sensitivity correction processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If output data is updated at a high sampling rate, then detection accuracy is improved, but noise contamination increases when downstream sampling rate is lower
Solution Approach 1:
The patent applies preliminary action by performing average processing on detection data before outputting to downstream devices. The calculation processing unit computes averages of N data values in advance, so when data is transferred to downstream devices with lower sampling rates, the noise has already been reduced. This prevents noise contamination from affecting downstream processing while maintaining high detection accuracy through the original high-rate sampling.
2Object-affected harmful factors
If average processing is performed on N data values, then noise is reduced, but calculation amount increases
Solution Approach 1:
The patent applies partial action by selectively performing average processing only on the necessary number of data values (N values) required to match downstream sampling rates. Rather than processing all possible data or using complex filtering algorithms, the system calculates exactly N averaged values where N is determined by the ratio of sampling rates. This provides sufficient noise reduction while minimizing unnecessary calculation overhead.
3Productivity
If calculation data is generated at lower rate, then downstream processing efficiency is improved, but noise reduction effectiveness decreases
Solution Approach 1:
The patent resolves this contradiction by performing noise reduction through average processing in advance, before generating calculation data at the lower rate. The calculation processing unit first computes averages of N detection data values to reduce noise, then outputs this pre-processed data at the appropriate lower sampling rate. This ensures both noise reduction effectiveness and downstream processing efficiency are achieved simultaneously.
Data Source
AI summary
A detection circuit (physical quantity detection circuit) includes a digital calculation circuit (calculation processing unit) that performs calculation processing of generating calculation data in response to magnitude of a physical quantity based on detection data formed by digitalization of a detection signal corresponding to the physical quantity. When N is an integer number equal to or larger than two, the digital calculation circuit performs the calculation processing including average processing of calculating an average value of N data values contained in at least one of the detection data and data obtained by performing part of the calculation processing.