Adaptive Pulse Rate Judgment via Dynamic Range Adjustment
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Solution Overview
Problem
Existing pulse rate monitoring technologies face challenges in accurately determining the appropriateness of calculated pulse rates due to rapid changes, erroneous judgments, and impaired responsiveness, particularly when setting variation acceptable ranges, leading to incorrect classifications of normal and abnormal values.
Innovation Solution
A biological information processing device that includes a pulse rate calculation part, a deviation degree judgment part, a reliability judgment part, and an appropriateness judgment part to determine the appropriateness of the calculated pulse rate based on the deviation degree and reliability, with adaptive adjustment of the variation acceptable range based on continuous improperness judgments and body motion analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of threshold times is increased to avoid erroneous judgment, then the reliability of pulse rate judgment is improved, but the responsiveness of the system deteriorates
Solution Approach 1:
The patent dynamically adjusts the variation acceptable range based on the exercise state of the test subject. When the exercise state changes (start/stop of exercise), the system adapts the acceptable range to accommodate rapid pulse rate changes, reducing the number of threshold times needed for judgment and thereby improving responsiveness while maintaining reliability.
Solution Approach 2:
The system changes the parameter of variation acceptable range width based on different exercise states. By widening the range during exercise transitions and narrowing it during stable states, the system reduces erroneous judgments without requiring excessive threshold times, thus balancing reliability and responsiveness.
2Device complexity
If a fixed variation acceptable range is used for pulse rate judgment, then the device complexity is reduced, but the adaptability to changing pulse rate trends deteriorates
Solution Approach 1:
The patent implements a dynamic variation acceptable range that automatically adjusts based on the detected exercise state. The range widens during exercise transitions (start/stop) when pulse rate changes rapidly, and narrows during steady-state exercise, providing adaptability without requiring complex manual configuration or multiple fixed ranges.
Solution Approach 2:
The system automatically detects exercise state changes and self-adjusts the variation acceptable range without user intervention. This self-service mechanism maintains high adaptability to pulse rate trends while keeping the device complexity low, as the adjustment logic is embedded in the automatic judgment process.
3Adaptability or versatility
If the variation acceptable range is widened to accommodate rapid pulse rate changes, then the adaptability is improved, but the measurement precision deteriorates
Solution Approach 1:
The system dynamically adjusts the variation acceptable range width based on exercise state transitions. During rapid changes (exercise start/stop), the range widens to accommodate the changes, preventing erroneous improper judgments. During stable exercise states, the range narrows to maintain measurement precision, thus resolving the contradiction between adaptability and precision.
Solution Approach 2:
The patent changes the parameter of variation acceptable range width according to different exercise states. By adjusting this parameter to be larger during transitions and smaller during steady states, the system achieves both adaptability to rapid changes and precision during stable measurement, eliminating the need for a fixed compromise value.
Data Source
AI summary
A method for determining an appropriateness of a calculated pulse rate is provided. In a pulse rate monitor, a pulse rate calculation part calculates the pulse rate of the test subject based on the result detected by a pulse wave sensor. Then, a pulse rate difference calculation part calculates a difference (pulse rate difference) between a reference pulse rate and a calculated pulse rate, and a deviation degree is determined based on the pulse rate difference. Also, a SN ratio calculation part calculates a SN ratio of a pulse wave signal detected by the pulse wave sensor, and a reliability of the calculation result in the pulse rate calculation part is determined based on the SN ratio. Then, a pulse rate appropriateness judgment part determines an appropriateness of the calculated pulse rate based on the pulse rate difference (deviation degree) and the SN ratio (reliability).