Pulse Detector Unworn State Detection Using Body Movement
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Solution Overview
Problem
Pulse detectors face challenges in accurately detecting when they are unworn, leading to incorrect pulsation count readings and increased power consumption, especially when the subject is still or sleeping, as existing methods require special configurations or struggle with distinguishing between the body's ground potential and external noise.
Innovation Solution
Incorporating a pulse wave sensor with sensitivity adjustment and a body movement sensor to detect the unworn state based on sensitivity levels and body movement signals, with additional frequency analysis for improved precision, allowing for accurate unworn state detection without a special configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pulse detector continues processing to identify pulse components using past pulse signal trends, then pulse detection capability is maintained, but erroneous pulse components are detected and incorrect pulsation count information is displayed when the device is unworn
Solution Approach 1:
The system performs preliminary unworn state detection by analyzing body movement sensor signals before continuing pulse detection processing. When no body movement is detected, the system proactively stops pulse detection processing to prevent erroneous pulse component detection, rather than waiting for errors to occur
Solution Approach 2:
The body movement sensor acts as an intermediary indicator to infer the worn/unworn state. Since direct detection of device attachment status is difficult, the system uses body movement signals as a mediator to indirectly determine whether the device is being worn, thereby controlling pulse detection processing appropriately
2Productivity
If the pulse detector continues processing and displaying pulsation count and burned calories, then biological information is provided to the subject, but power consumption increases when the device is unworn
Solution Approach 1:
The system performs periodic unworn state detection using body movement sensor signals at scheduled intervals. Based on this periodic detection, the system intermittently stops or continues pulse detection processing, creating a periodic operation pattern that reduces overall power consumption while maintaining functionality when needed
Solution Approach 2:
The system uses its own body movement sensor to automatically detect unworn states and control its processing operations. This self-service mechanism allows the device to autonomously manage its power consumption without requiring external control, stopping processing when unworn and resuming when worn
3Measurement precision
If pressure sensors or ground potential detection methods are used to detect unworn state, then unworn state detection capability is added, but device complexity increases due to special configurations
Solution Approach 1:
The body movement sensor serves multiple functions: it detects body movement for activity monitoring and simultaneously serves as an indicator for unworn state detection. By making the sensor multi-functional, the system avoids adding special detection configurations while achieving accurate unworn state detection
Solution Approach 2:
The system uses its existing body movement sensor to detect unworn states without requiring additional specialized sensors or configurations. The same sensor that monitors activity also provides information about device attachment status, making the system self-sufficient and avoiding increased complexity
4Measurement precision
If the pulse detector uses body movement sensor signals to detect unworn state, then unworn state detection is achieved, but it is difficult to distinguish between resting and completely still states
Solution Approach 1:
The system continuously monitors body movement sensor signals and uses feedback from these signals to determine unworn states. By comparing current movement levels with historical data and using threshold-based feedback mechanisms, the system can distinguish between temporary stillness during rest and the complete absence of movement when unworn
Solution Approach 2:
The system establishes baseline movement patterns and thresholds before making unworn state determinations. By preliminarily analyzing movement characteristics and setting appropriate thresholds, the system prepares the criteria needed to distinguish between resting and unworn states, reducing the difficulty of differentiation
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
Enables high-accuracy detection of the unworn state, reducing power consumption and preventing erroneous information display by stopping unnecessary operations when the pulse detector is not in use, while differentiating between resting and unworn states.
Implementation Method 1
a pulse wave sensor that outputs a pulse wave signal possibly including a pulse signal
Implementation Method 2
a body movement sensor that detects body movement of the subject and outputs a body movement sensor signal originating from the body movement
Data Source
AI summary
To detect whether the pulse detector is in an unworn state, the pulse detector is provided for detecting a pulse signal that originates in the pulse of a subject has a pulse wave sensor, a pulse wave sensor sensitivity adjustment section that adjusts the sensitivity of the pulse wave sensor, a body movement sensor, and an unworn-state detector that detects that the pulse detector has been removed from the subject and is in an unworn state, on the basis of the sensitivity of the pulse wave sensor sensitivity adjustment section and a body movement sensor signal outputted from the body movement sensor.