Fall Detection Mode Switching to Prevent False Alarms
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Solution Overview
Problem
Existing 3D Time of Flight (ToF) sensor-based fall detection systems struggle with false alarms due to difficulty in distinguishing between a person lying down intentionally and a person who has fallen, and the no-fall-detection mode can be inadvertently left active, leading to missed fall events.
Innovation Solution
Implement a particular operating mode where the system monitors activities without raising alarms for specified activities, automatically exiting this mode after a defined period of inactivity or user intervention, ensuring timely detection of falls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the system operates in no-fall-detection mode to prevent false alarms, then false alarm rate is reduced, but fall detection reliability deteriorates
Solution Approach 1:
The system dynamically switches between no-fall-detection mode and normal detection mode based on detected activities. When specified activities (like lying down) are detected, the system enters no-fall-detection mode to prevent false alarms. When inactivity is detected for a defined period, the system automatically exits this mode and returns to normal fall detection, ensuring both false alarm prevention and reliable fall detection at different times
Solution Approach 2:
The system automatically manages the transition between modes without requiring manual user intervention. The control device monitors activities continuously and autonomously decides when to enter or exit no-fall-detection mode based on predefined criteria (specified activities detected vs. inactivity period elapsed), eliminating the risk of users forgetting to switch modes
2Measurement precision
If the system continuously monitors activities to detect falls, then fall detection accuracy is improved, but false alarms increase due to inability to distinguish intentional lying down from falls
Solution Approach 1:
The system adapts its detection behavior dynamically based on the current operating mode. In normal mode, it monitors for fall events with high accuracy. When specified activities are detected, it transitions to no-fall-detection mode where alarm functions are suppressed, effectively filtering out false alarm scenarios while maintaining accurate fall detection capability when needed
Solution Approach 2:
The system changes the alarm output parameter based on detected activities. When specified activities are detected, the alarm parameter is adjusted to 'no alarm' state. When inactivity is detected for the defined period, the parameter reverts to normal alarm functionality, allowing the system to adapt its response based on contextual information
Data Source
AI summary
A method of operating a fall detection system is disclosed. The system comprises at least one fall detection sensor communicatively connected to an alarm device. The fall detection system is configured to have a particular operating mode of raising no alarm when a specified activity is detected by the at least one fall detection sensor. The method comprises the steps of: actuating the particular operating mode of the fall detection system; controlling the fall detection sensor to monitor activities of the user; exiting the particular operating mode of the fall detection system when no activity is detected for a defined period of time.