Wearable Audio Earbud State Detection Using Ultrasonic Signals
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Solution Overview
Problem
Existing audio devices face challenges in accurately determining whether an earbud is being worn by a user, particularly in terms of power efficiency and reliability, as current methods often require high power for state detection and may result in false indications.
Innovation Solution
The implementation of a system that uses a combination of sensors, including microphones and motion sensors, to detect potential state changes by emitting ultrasonic signals and analyzing ambient noise, allowing for reduced power consumption and improved accuracy in determining the state of the earbud, such as being in-ear or not, through the use of lower-power techniques for initial detection and higher-power measurements for confirmation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-power measurement techniques are used continuously to determine earbud state, then measurement precision and reliability are improved, but use of energy increases
Solution Approach 1:
The system performs preliminary low-power detection using motion sensors and ambient noise analysis to identify potential state changes before initiating high-power ultrasonic measurements. This preliminary action filters out false positives and reduces unnecessary high-power operations, resolving the contradiction between continuous high-precision measurement and energy consumption.
Solution Approach 2:
The system employs periodic state detection cycles where low-power sensors continuously monitor for changes, and high-power ultrasonic measurements are periodically activated only when potential state changes are detected. This periodic activation pattern maintains measurement precision when needed while significantly reducing average power consumption compared to continuous high-power operation.
2Use of energy by moving object
If low-power detection techniques are used continuously, then use of energy is reduced, but measurement precision deteriorates
Solution Approach 1:
The state detection process is segmented into two distinct stages: low-power preliminary detection using motion sensors and ambient noise analysis, followed by high-power confirmatory ultrasonic measurement only when necessary. This segmentation allows the system to use low-power techniques continuously for basic monitoring while reserving high-power measurements for confirmed state changes, thus reducing overall energy consumption without sacrificing measurement precision.
Solution Approach 2:
The system introduces intermediate detection mechanisms (motion sensors and ambient noise analysis) that act as mediators between continuous low-power operation and high-power ultrasonic measurement. These intermediaries provide sufficient precision for initial state assessment at low power, and only trigger high-power measurements when the intermediate detection indicates a potential state change, thereby reducing energy consumption while maintaining acceptable measurement precision.
3Reliability
If multiple sensors are used for state detection, then reliability is improved, but device complexity increases
Solution Approach 1:
The system merges multiple sensor types (motion sensors, ambient noise microphones, and ultrasonic transducers) into a unified state detection framework where each sensor serves a specific function at different operational stages. The motion sensor and ambient noise analysis work together for preliminary detection, while ultrasonic transducers provide confirmatory measurement. This merging approach improves reliability through multi-sensor verification while managing complexity by assigning clear roles to each sensor type.
Solution Approach 2:
Motion sensors and ambient noise microphones perform preliminary detection actions continuously at low power, filtering and preparing data for potential high-power ultrasonic measurement. This preliminary action reduces the burden on the ultrasonic system and allows for more reliable state determination through coordinated multi-sensor operation, improving reliability without proportionally increasing 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
This approach reduces average power requirements over time by initiating high-power measurements only when a low-power detection of a potential state change occurs, enhancing the accuracy and reliability of determining the earbud's state while minimizing power usage.
Implementation Method 1
an ultrasonic emitter to emit an ultrasonic signal and an ultrasonic receiver to receive the reflected ultrasonic signal
Data Source
AI summary
Aspects of the subject technology provide improved techniques for determining a state of an audio device, including reduced power techniques for determining if an earbud is currently being worn in a user's ear or not. In aspects, a potential state change in an audio device may be detected, and in response measurement of the state of the device may be initiated, such as by emitting an audio signal and then determining the state of the audio device based on a sensed version of the emitted audio signal.