Bedding Sensor Sleep State Management for Disturbance Correction

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing sleep state management devices using vibration sensors in bedding struggle to accurately determine body movements due to external disturbances such as vibrations from automobiles, wind, and mobile phone vibrators, leading to inaccurate sleep state assessments.

Innovation Solution

A sleep state management device employing a three-axis accelerometer sensor to detect movement in bedding, which calculates differences between adjacent peak values in detection signals and corrects determinations based on cyclic periods of body movement and external disturbances, ensuring accurate differentiation between body movement and external noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a vibration sensor is used to detect movements in bedding, then sleep state can be monitored non-invasively, but the signal level becomes extremely low and susceptible to external disturbances

Engineering Contradiction:

Improvenon-invasive sleep monitoringVSAvoidbody movement detection accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The system performs preliminary classification of signal periods into cyclic patterns and continuous periods before final body movement determination. By pre-identifying cyclic patterns (which typically represent external disturbances) and continuous periods (which typically represent actual body movements), the system can apply different determination criteria to each type, thereby improving measurement precision while maintaining non-invasive monitoring

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The detection signal is segmented into different period types (cyclic periods and continuous periods) based on their temporal characteristics. This segmentation allows the system to analyze and determine body movements differently for each segment type, improving overall detection accuracy by addressing the low signal level and external disturbance issues through targeted processing of each segment

Inventive Principle:

Principle #1Segmentation

2Productivity

If body movement detection is performed using detection signals from bedding sensors, then sleep state management is achieved, but external disturbances cause erroneous determination of body movements

Engineering Contradiction:

Improvesleep state management capabilityVSAvoidbody movement determination accuracy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system performs preliminary classification of signal periods into cyclic patterns and continuous periods before final body movement determination. By pre-identifying cyclic patterns (which typically represent external disturbances) and continuous periods (which typically represent actual body movements), the system can apply different determination criteria to each type, thereby improving reliability while maintaining sleep state management capability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses the characteristics of detected periods (cyclic vs. continuous) to provide feedback on the likely source of the signal, adjusting the determination process accordingly. This feedback mechanism helps distinguish between external disturbances and actual body movements, improving the reliability of sleep state management decisions

Inventive Principle:

Principle #23Feedback

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 device effectively differentiates between body movement and external disturbances, providing accurate sleep state management by correcting erroneous determinations and improving the reliability of sleep state assessment.

Implementation Method 1

a three-axis accelerometer sensor to detect movement in bedding

Methodology Applied

Scientific EffectAccelerometer: Accelerometer

Data Source

PatentUS9962120B2Sleep state management device, sleep state management method, and sleep state management program

Publication Date: 2018.05.08 OMRON HEALTHCARE CO LTD

AI summary

A control unit makes a provisional determination as to whether or not a measurement subject is moving using a detection signal from a sensor that detects movement in bedding on which the measurement subject is sleeping. In the case where at least one of a first period, in which periods determined to have body movement repeat cyclically, and a second period, in which a period determined to have body movement continues for at least a predetermined amount of time, has occurred, at least one of a period in the first period determined to have body movement and the second period are corrected to a period of no body movement.