Headset Don/Doff Detection Using Angle Sensors
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Solution Overview
Problem
Don/Doff sensors in audio headsets often generate false positive signals when the headset is placed near electronic devices, leading to wasted power consumption and incorrect state indications, as they fail to accurately differentiate between wearable and non-wearable positions.
Innovation Solution
Incorporating a combination of angle of rotation sensors and Don/Doff sensors, with logic that controls power management modes and enables/disables the Don/Doff sensor based on the relative timing of signals from both sensors, to accurately determine the headset's state and reduce false positives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Don/Doff sensors are used to detect headset state, then power management control is enabled, but false positive signals are generated when headset is near electronic devices
Solution Approach 1:
The patent combines Don/Doff sensors with angle of rotation sensors to create a multi-sensor detection system. The logic circuit processes signals from both sensor types together, merging their outputs to make comprehensive state determination. This combination allows the system to cross-validate sensor readings and eliminate false positives that would occur with either sensor type alone, thereby improving reliability without sacrificing power management efficiency.
2Measurement precision
If Don/Doff sensors continuously monitor headset state, then accurate state indication is achieved, but battery power is wasted when headset is not being worn
Solution Approach 1:
The patent implements dynamic sensor control where the monitoring behavior adapts based on detected conditions. The logic circuit continuously evaluates angle of rotation sensor data and only activates Don/Doff sensors when the headset is in a wearable configuration. This dynamic adjustment of sensor operation modes ensures high measurement precision when needed while minimizing power consumption during storage or non-wearable states.
Solution Approach 2:
The system employs periodic sampling of sensor data rather than continuous monitoring. The logic circuit checks angle of rotation at regular intervals and only triggers Don/Doff detection when appropriate conditions are met. This periodic action maintains adequate state indication accuracy while significantly reducing overall power consumption compared to continuous sensor operation.
3Device complexity
If only Don/Doff sensors are used, then device complexity is low, but false state indications occur leading to incorrect power management
Solution Approach 1:
The logic circuit serves as an intermediary that processes and reconciles data from multiple sensors. It receives raw signals from both Don/Doff sensors and angle of rotation sensors, applies detection algorithms, and produces a unified state determination. This intermediary processing layer manages the complexity of multi-sensor integration while significantly improving reliability by cross-validating readings and eliminating false positives that would occur with single-sensor systems.
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
This solution improves power management and reduces false state indications by accurately detecting when the headset is being worn or stored, thereby optimizing power usage and user experience.
Implementation Method 1
a first sensor on the headset for sensing an angle of rotation of the speaker capsule relative to the headband
Implementation Method 2
a second sensor on the headset for sensing a Don/Doff event
Data Source
AI summary
A headset is described which includes a speaker capsule and a headband connected to the speaker capsule with a first sensor on the headset for sensing an angle of rotation of the speaker capsule relative to the headband, and a second sensor on the headset for sensing a Don/Doff event. The angle of rotation sensor can indicate whether the speaker capsule on the headband is in a wearable position or in a non-wearable position. Logic controls an operation of the headset in response, such as changing power management modes, signaling host devices, and enabling/disabling the second sensor.