Wearable Pulse Rate Sensor Motion Error Suppression
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Solution Overview
Problem
Wearable electronic devices that measure pulse rate often display erroneous data due to user movements, leading to user uncertainty about the accuracy of the displayed information.
Innovation Solution
Incorporating a motion detection sensor to detect directional motion and an error factor detector that determines when user movement causes errors in pulse rate data, allowing the device to display a 'dummy pulse rate' or halt data acquisition temporarily, thereby minimizing display variations and user doubt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the device continuously displays pulse rate data during user movement, then data acquisition remains uninterrupted, but measurement precision deteriorates due to motion-induced errors
Solution Approach 1:
The device performs preliminary detection of motion state through acceleration sensors before determining whether to acquire or display pulse rate data. By detecting user movement in advance and preemptively stopping acquisition or suppressing display during motion periods, the system prevents erroneous data from being recorded or shown, thereby maintaining measurement precision while minimizing interruption to overall data collection
Solution Approach 2:
The system continuously monitors acceleration data and uses this feedback to dynamically control pulse rate acquisition and display. When motion exceeding a threshold is detected, the system feedback-loops to stop acquisition or suppress display, and resumes normal operation when motion subsides. This closed-loop control ensures high measurement precision during stationary periods while maintaining overall productivity through rapid resumption of data collection
2Loss of information
If the device displays pulse rate data during motion, then information availability is maintained, but reliability deteriorates due to erroneous measurements
Solution Approach 1:
The device extracts and separates the display function from the data acquisition function during motion periods. When user movement is detected, the system continues to acquire pulse rate data internally (maintaining information availability) but extracts the erroneous data from the display output by suppressing its presentation. This allows the system to maintain information continuity while ensuring reliability by preventing inaccurate data from reaching the user interface
Solution Approach 2:
The system performs preliminary assessment of motion state before data is displayed. By detecting acceleration patterns that indicate user movement in advance of pulse rate measurement completion, the system can preemptively prevent erroneous data from being displayed while maintaining the acquisition process. This ensures reliability is preserved without compromising information availability, as data collection continues uninterrupted
3Measurement precision
If the device stops data acquisition during motion detection, then measurement precision is maintained, but productivity decreases due to interrupted collection
Solution Approach 1:
The device applies partial action by selectively stopping data acquisition only during periods when motion exceeds a predefined threshold, while continuing acquisition during normal stationary periods. This partial suspension of acquisition maintains high measurement precision during critical measurement phases without excessively interrupting overall data collection. The system uses acceleration threshold comparison to determine when to apply the stop action, ensuring precision is maintained while minimizing productivity loss through targeted rather than continuous interruption
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces the likelihood of users questioning the accuracy of displayed pulse rates by stabilizing the displayed values and providing clear differentiation between accurate and erroneous data, enhancing user trust in the device's readings.
Implementation Method 1
the error factor detector includes a motion detection sensor that detects a direction of motion of the electronic device
Data Source
AI summary
An electronic device includes a biological information acquirer that acquires biological information of a target; an error factor detector that detects a factor that causes an error in the biological information; a display; and at least one processor. The error factor detector includes a motion detection sensor that detects a direction of motion of the electronic device, and the processor is that determines whether the factor is detected, based on the direction of the motion of the electronic device; and to cause, when the processor determines that the factor is detected, the display not to display the biological information acquired by the biological information acquirer, or to cause the biological information acquirer to stop acquisition of the biological information, in a period determined based on a timing when the factor is detected.