Hold State Change Detection Using Sensor Pattern Analysis
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Solution Overview
Problem
Existing hold state detection methods for mobile devices fail to accurately distinguish between changes and non-changes in the hold state, leading to incorrect recognition of the device's state.
Innovation Solution
A hold state change detection apparatus that utilizes a combination of sensors, including acceleration, angular velocity, and geomagnetic sensors, to acquire and process output signals, employing pattern storage and analysis to differentiate between hold states and detect changes by calculating characteristic amounts and comparing them to reference patterns, thereby improving the accuracy of hold state recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor output is used to calculate fluctuation amount of average movement or movement trajectory, then hold state can be identified, but it is impossible to accurately recognize the hold state because the method cannot distinguish between output when hold state is changing and output when hold state is not changing
Solution Approach 1:
The patent segments the detection process into two distinct stages: a learning stage where the system learns sensor output patterns during hold state changes, and a detection stage where the system uses the learned patterns to accurately detect hold state changes. This segmentation allows the system to distinguish between sensor outputs during state transitions and stable states, resolving the accuracy-reliability contradiction.
Solution Approach 2:
The patent performs preliminary learning of sensor output characteristics during hold state changes before actual detection begins. By pre-acquiring and storing reference data that represents state transition patterns, the system can reliably distinguish between transient and stable states during operation, improving both measurement precision and detection reliability.
2Measurement precision
If multiple sensors are combined to detect hold state, then detection capability is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple sensor types (acceleration sensor, angular velocity sensor, and/or geomagnetic sensor) into a unified detection system that processes their outputs collectively. By combining sensor data and analyzing their combined output patterns during the learning stage, the system achieves improved hold state detection accuracy while managing complexity through integrated processing.
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 apparatus effectively detects changes in the hold state of a mobile device, enhancing the accuracy of hold state recognition and reducing incorrect judgments by isolating signals related to user movement from those related to hold state fluctuations.
Implementation Method 1
an acceleration sensor that detects acceleration in a predetermined direction
Implementation Method 2
an angular velocity sensor that detects angular velocity about a predetermined axis
Implementation Method 3
a geomagnetic sensor that detects a geomagnetic vector
Data Source
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AI summary
In order to accurately identify a hold state of a mobile device held by a user while the user is moving, provided is a hold state change detection apparatus including an acquiring section that acquires an output signal of a sensor mounted in the mobile device held by the user; a change detecting section that detects a change in a hold state of the mobile device based on the output signal of the sensor; and a hold state judging section that judges the hold state based on the output signal of the sensor. During a prescribed time from the time when the change detecting section detects the change in the hold state, information indicating the hold state prior to the detection of the change in the hold state is output. Also provided is a hold state change detection method and program.