Ear Canal Receiver Hearing Dose Monitoring
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Solution Overview
Problem
Current devices fail to effectively monitor and mitigate the cumulative effect of noise exposure on hearing, particularly with the use of headphones, as they do not account for duration of exposure or restorative periods, leading to potential hearing damage.
Innovation Solution
A method for calculating estimated sound pressure levels and doses received by an ear canal receiver, comparing them to permissible levels, and using recovery functions to adjust exposure, incorporating both direct and ambient noise measurements to prevent hearing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If headphones provide high sound output levels for adequate listening experience, then user satisfaction is improved, but risk of cumulative hearing damage increases due to prolonged exposure
Solution Approach 1:
The system continuously monitors the user's hearing threshold through audiometric tests and provides feedback by dynamically adjusting the maximum permissible output levels of the headphones. The processor calculates real-time exposure doses based on actual usage patterns and modifies volume limits to prevent cumulative damage while maintaining adequate listening quality within safe boundaries.
Solution Approach 2:
The patent implements dynamic adjustment of volume limits based on time-varying factors including duration of exposure, cumulative dose accumulation, and individual hearing threshold changes. The system transitions from static volume limiting to dynamic control that adapts permissible levels in real-time based on monitored hearing status and exposure history.
2Object-affected harmful factors
If headphones limit maximum output levels to prevent hearing damage, then hearing protection is improved, but listening quality deteriorates due to insufficient volume
Solution Approach 1:
The system performs preliminary audiometric testing to establish the user's baseline hearing threshold before allowing normal listening. Based on this preliminary assessment, the processor pre-calculates safe maximum output levels that provide adequate listening quality while staying within individualized safety boundaries. The system proactively adjusts limits before damage can occur rather than reactively limiting after exposure begins.
3Measurement precision
If the system continuously monitors sound exposure levels to calculate cumulative dose, then hearing protection accuracy is improved, but device complexity increases due to additional sensors and processing
Solution Approach 1:
The patent makes the earpiece components serve multiple functions: the speaker acts as both audio output device and stimulus source for hearing threshold testing, the microphone serves as both ambient noise sensor and receiver for user responses during audiometric tests, and the processor performs both audio signal processing and hearing health monitoring. This multi-functionality reduces the need for separate dedicated sensors and processing units.
Solution Approach 2:
The system uses the user's own ear canal acoustics and hearing responses to perform self-diagnosis of hearing threshold changes. By presenting test tones through the earpiece speaker and capturing the user's natural ear canal resonance and response through the microphone, the system enables the earpiece itself to monitor its own output safety without requiring external medical equipment.
4Measurement precision
If the system accounts for restorative periods between exposures to calculate net dose, then hearing damage assessment accuracy is improved, but computational complexity increases due to time-dependent modeling
Solution Approach 1:
The system implements periodic audiometric testing at scheduled intervals to measure actual hearing threshold changes rather than continuously computing complex restorative models. Between tests, the processor uses simplified dose accumulation algorithms that track exposure without attempting to model biological recovery in real-time. The periodic measurements provide empirical data that validates and adjusts the simplified computational model.
Data Source
AI summary
Methods of operating an audio device are provided. A method includes calculating estimated sound pressure levels (SPLs) for drive signals directed to an ear canal receiver (ECR) during a time increment Δt; calculating an estimated SPL_Dose during the time increment Δt using the estimated sound pressure levels; and calculating a total SPL_Dose at a time t of the audio device using the estimated SPL_Dose.