Air Pressure Sensor Earphone Insertion Detection
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Solution Overview
Problem
Existing wireless hearable devices face issues with false positives when determining if they are being worn, as proximity sensors cannot distinguish between objects and may activate when in a pocket, and methods relying on occlusion gain require a near-perfect air-tight seal.
Innovation Solution
Incorporating an air pressure sensor that detects changes in air pressure within the ear canal to confirm the device's usage state, eliminating the need for a stimulus sound and allowing accurate detection even with a non-air-tight seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If proximity sensors are used to determine device usage state, then the device can be activated when near the user's head, but false positives occur when the device is in the user's pocket or held in hand
Solution Approach 1:
An air pressure sensor is introduced as an intermediary measurement tool to detect whether the device is inserted into the ear canal. The sensor measures air pressure changes caused by the tip occluding the ear canal, providing a more reliable indication of actual usage state compared to proximity-based methods.
Solution Approach 2:
The system monitors changes in air pressure parameters within the ear canal to determine usage state. When the device is inserted, the tip occludes the ear canal causing measurable air pressure changes that distinguish actual ear insertion from mere proximity, thereby reducing false positives.
2Measurement precision
If occlusion gain method is used to confirm ear insertion, then the device can detect when inside the ear canal, but it requires a near-perfect air-tight seal which is difficult to achieve
Solution Approach 1:
The patent replaces the mechanical/acoustic occlusion gain method with an air pressure sensing approach. Instead of relying on acoustic signal changes that require perfect sealing, the system uses air pressure sensors to detect the physical presence of the tip in the ear canal through pressure changes, significantly reducing the sealing precision requirement.
Solution Approach 2:
The system transitions from measuring acoustic parameter changes (occlusion gain) to measuring air pressure parameter changes. This parameter substitution allows for more tolerant seal quality while maintaining accurate ear insertion detection, as air pressure changes occur even with imperfect seals.
3Measurement precision
If stimulus sound is produced to detect occlusion gain, then ear insertion can be detected, but additional power is consumed and complexity increases
Solution Approach 1:
The patent extracts the air pressure sensing function from the acoustic measurement system. By using a dedicated air pressure sensor to detect ear insertion, the system eliminates the need to produce stimulus sounds and analyze occlusion gain, thereby reducing power consumption and simplifying the overall detection mechanism.
Solution Approach 2:
The air pressure sensor passively detects ear insertion by monitoring natural air pressure changes in the ear canal environment. No active stimulus sound generation is required, as the sensor utilizes the existing acoustic environment and pressure dynamics to determine usage state, thereby conserving energy.
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 approach provides a higher confidence in determining the device's usage state, reducing false positives and conserving power by eliminating the need for a stimulus sound and near-perfect seal requirements.
Implementation Method 1
the air pressure sensor produces an air pressure signal that indicates the air pressure within the ear canal... the air pressure sensor detects changes in the air pressure within the ear canal, with respect to ambient atmospheric pressure. These changes are caused by the tip of the earphone when it creates a seal within the ear canal and compresses the volume of air
Data Source
AI summary
A method for determining a current usage state of an earphone that includes a speaker and an air pressure sensor. The method obtains a pressure signal from the air pressure sensor that indicates air pressure proximate to the earphone, the air pressure sensor produces the pressure signal in response to the earphone being inserted into an ear of a user. The method processes the obtained pressure signal to determine that the earphone is in a state of use, and in response, performs at least one of (1) outputting an audio signal through the speaker signifying that the earphone is in use (2) establishing a wireless connection with a media playback device to exchange data between the earphone and the media playback device, or combination thereof.