Biological Information Processing Device Using Body Motion Estimation
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Solution Overview
Problem
Existing biological information processing devices struggle to measure pulse rate accurately when temperature is low or the contact between pulse wave sensors and the arm is poor, leading to unreliable or delayed pulse rate measurements, especially during exercise.
Innovation Solution
A biological information processing device that uses a pulse wave sensor and a body motion sensor to perform estimation processing for pulse wave information even when the pulse wave sensor is off, allowing for the estimation of pulse wave information based on body motion information and corresponding relationship information, and includes features like intermittent on/off control of the pulse wave sensor to reduce electricity consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pulse wave sensor is used to measure pulse rate, then pulse rate measurement is achieved, but measurement fails when temperature is low or contact is poor
Solution Approach 1:
The patent introduces body motion information as an intermediary to estimate pulse rate when direct measurement fails. The processor uses acceleration sensor data to calculate body motion intensity and estimates pulse rate based on the relationship between body motion and pulse rate, serving as a mediator when the pulse wave sensor cannot provide reliable measurements
Solution Approach 2:
The patent changes the measurement parameter from direct pulse wave detection to body motion-based estimation. When temperature or contact conditions are unfavorable, the system switches to using acceleration sensor data and body motion intensity as the basis for determining pulse rate, effectively changing the physical parameter used for measurement
2Reliability
If pulse wave sensor is kept on continuously to ensure measurement availability, then measurement coverage is improved, but electricity consumption increases
Solution Approach 1:
The patent implements periodic action by controlling the pulse wave sensor to operate intermittently rather than continuously. The sensor is activated at specific intervals or under specific conditions, allowing the system to balance measurement availability with energy conservation, while body motion-based estimation fills in between measurement periods
Solution Approach 2:
The system uses body motion information from the acceleration sensor to self-service the pulse rate estimation function. When the pulse wave sensor is off, the processor autonomously estimates pulse rate using body motion data, eliminating the need for continuous sensor operation while maintaining measurement functionality
3Measurement precision
If pulse rate measurement is delayed until pulse wave sensor is activated, then measurement accuracy is maintained, but waiting time for users increases
Solution Approach 1:
The patent applies preliminary action by calculating body motion intensity in advance and using it to estimate pulse rate before the pulse wave sensor is activated. The processor continuously monitors body motion and prepares estimation data, so when the sensor is turned on or when measurement is needed, the system can immediately provide pulse rate information without significant delay
Data Source
AI summary
A biological information processing device includes: a pulse wave sensor which measures a pulse wave of a user; a body motion sensor which detects a body motion of the user; and a processing unit which performs estimation processing for pulse wave information of the user. The processing unit performs the estimation processing based on body motion information acquired using a signal from the body motion sensor, even if the pulse wave sensor is off.