Headset On-Head Detection Using Three Capacitive Sensors
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Solution Overview
Problem
Existing headset on-head detection solutions are prone to false positives due to capacitive sensors being activated by non-head contact, such as a user grabbing the headset, leading to inefficient power consumption.
Innovation Solution
A headset with three capacitive sensors on the earcups and headband, coupled to a processor, determines if all sensors are capacitively coupled to the user, minimizing false positives by requiring simultaneous contact for activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single capacitive sensor is used for on-head detection, then the device complexity is reduced, but the reliability of detection deteriorates due to false positives from non-head contact
Solution Approach 1:
The patent divides the detection system into three separate capacitive sensors positioned at different locations (first earcup, second earcup, and headband). Each sensor independently monitors contact at its specific location, and the system requires all three to detect on-head state. This segmentation approach reduces false positives from non-head contact while maintaining manageable device complexity through distributed sensing.
2Use of energy by moving object
If capacitive sensors are used for on-head detection, then the power consumption is reduced compared to other sensing methods, but false positives occur when users grab the headset
Solution Approach 1:
By segmenting the detection into three separate capacitive sensors at different locations, the system maintains low power consumption characteristics of capacitive sensing while reducing false positives. The segmentation ensures that casual grabbing of the headset does not simultaneously activate all three sensors, thereby maintaining detection reliability without increasing power usage significantly.
Solution Approach 2:
The patent introduces an intermediate processing layer that receives signals from all three capacitive sensors and applies logic to determine the final on-head state. This intermediary processing layer filters out false positives by requiring consistent detection across multiple sensors before triggering on-head mode, thereby maintaining the low power consumption advantage of capacitive sensors while improving reliability.
3Reliability
If multiple capacitive sensors are used to minimize false positives, then the reliability of detection is improved, but the device complexity increases
Solution Approach 1:
The system segments detection into three strategically positioned capacitive sensors, each handling a specific monitoring location. This segmentation improves reliability by requiring all three sensors to confirm on-head state, while the modular nature of capacitive sensors keeps the added complexity manageable and distributed throughout the headset structure.
Solution Approach 2:
The capacitive sensors serve multiple functions: they detect on-head state, monitor wear consistency across different locations, and provide redundant verification to minimize false positives. This multi-functionality justifies the use of multiple sensors by extracting maximum value from each sensing element, thereby improving reliability without proportionally increasing overall system complexity.
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
Minimizes false positives in on-head detection, optimizing power consumption by ensuring sensors are only activated when the headset is properly worn, allowing for customized audio settings based on wear style.
Implementation Method 1
a first capacitive sensor configured for capacitively coupling to a user wearing the headset
Data Source
AI summary
A headset comprising a first earcup comprising a first capacitive sensor a second earcup comprising a second capacitive sensor, and a headband comprising a third capacitive sensor. A processor of the headset being configured to receive capacitive information from the first capacitive sensor, the second capacitive sensor, and the third capacitive sensor, to determine whether the first capacitive sensor, the second capacitive sensor, and the third capacitive sensor are capacitively coupled to a user wearing the headset based on the received capacitive information, and to set the headset to a first active mode, if the first capacitive sensor, the second capacitive sensor, and the third capacitive sensor are determined to be capacitively coupled to the user wearing the headset.