Noise Determination Device With Non-Integral Sampling Intervals
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Solution Overview
Problem
Existing noise determination methods for electronic devices are inefficient in detecting periodic noise with a lower number of samplings, leading to increased CPU load and data processing time, which can result in erroneous inputs.
Innovation Solution
A noise determination device that performs three samplings with non-integral multiple intervals set to minimize noise interference, ensuring all sampled values match to determine noise absence, thereby reducing the risk of erroneous inputs without requiring special circuits or significant system changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of times of samplings is increased to effectively remove periodic noise, then noise detection accuracy is improved, but CPU load increases and data processing speed becomes slower
Solution Approach 1:
The patent changes the sampling interval parameter to be non-integral multiples of the noise period, which allows accurate noise detection with fewer samplings. This parameter optimization resolves the contradiction by achieving high detection accuracy (improving measurement precision) while maintaining fast processing speed (preserving productivity) without requiring excessive sampling operations.
2Measurement precision
If the number of times of samplings is increased to read a larger volume of data, then noise detection accuracy is improved, but determination speed for determining the presence of noise becomes slower
Solution Approach 1:
By optimizing the sampling interval to non-integral multiples of the noise period, the patent achieves accurate noise detection with only three samplings instead of requiring numerous samplings. This dramatically reduces the time loss for determination while maintaining high detection accuracy, resolving the contradiction between measurement precision and loss of time.
3Ease of operation
If constant interval sampling is used, then sampling simplicity is maintained, but erroneous input occurs when noise period and sampling timing match
Solution Approach 1:
The patent modifies the sampling interval parameter from a constant value to non-integral multiples of the noise period. This simple parameter change maintains ease of operation (the sampling mechanism remains straightforward) while eliminating the reliability issue of erroneous inputs that occur when constant interval sampling coincides with noise periods.
Data Source
AI summary
A noise determination device is provided that determines the presence of noise on an input signal with a constant value that is output from an external device. The noise determination device includes a sampling unit that performs three samplings on the input signal, a sampling-interval setting unit that sets an interval between a first one and a second one of the samplings to have a value that is different from an integral multiple of the period of the periodic noise, and sets an interval between the second one and a third one of the samplings to be equal to or larger than an interval that is large enough to fully attenuate the periodic noise, and a noise determination unit that determines that the noise is not superimposed on the input signal only when all values acquired by the first, second, and third samplings match one another.