Dual-Clock Measurement Timing Correction for Low-Power Sensors
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Solution Overview
Problem
Wearable sensors face a trade-off between low power consumption and accurate measurement time due to the use of low-power oscillation circuits, which reduces clock signal precision, leading to inaccuracies in time management.
Innovation Solution
A measurement system that uses a first clock signal for frequent measurements and a second clock signal with higher precision to provide time stamps, allowing for correction of measurement times using time stamps from multiple measurements to achieve accurate timing with low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a highly accurate clock signal is used for measurement to accurately manage the measurement time, then the accuracy of the measurement time is improved, but power consumption increases
Solution Approach 1:
The patent divides the clock signal system into two segments: a first clock signal for frequent measurements and a second clock signal with better period accuracy for time stamping. This segmentation allows each clock signal to serve its specific function optimally, resolving the contradiction between measurement frequency and time accuracy while managing power consumption effectively.
Solution Approach 2:
The patent dynamically switches between using the first clock signal for routine measurements and the second clock signal for time stamping. This dynamic approach allows the system to maintain high measurement frequency with low power consumption while periodically correcting time accuracy, thus resolving the static contradiction between continuous high accuracy and power savings.
2Use of energy by moving object
If an oscillation circuit operating with low power consumption is used, then power consumption is reduced, but the precision of the clock signal is reduced, leading to reduced accuracy of measurement time
Solution Approach 1:
The patent introduces a time stamp provision unit as an intermediary that uses the second clock signal with better period accuracy to provide time stamps based on measurement results from the first clock signal. This intermediary mechanism allows the low-power first clock signal to perform frequent measurements while the high-accuracy second clock signal periodically corrects time stamps, thus resolving the contradiction between power consumption and time accuracy.
Solution Approach 2:
The patent performs preliminary time stamping using the second clock signal at specific intervals, which pre-establishes accurate time references. These pre-established time stamps are then used to correct measurement times from the first clock signal, allowing the system to maintain low power consumption while ensuring measurement time accuracy through periodic preliminary correction.
Data Source
AI summary
A measurement system includes a measurement unit configured to perform measurement a plurality of times on the basis of a first clock signal having a first clock period to obtain a plurality of measurement results, a time stamp provision unit configured to provide a time stamp indicating a measurement time to each measurement result obtained in the second period among the plurality of measurement results obtained using the measurement unit the basis of a second clock signal having a second clock period longer than the first clock period and having better period accuracy than the first clock signal, and a measurement time correction unit configured to correct a measurement time of a measurement result in accordance with a period specified using two time stamps and the number of measurement results obtained during the period.