Ear Defender Dose Meter with Internal Microphone
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Solution Overview
Problem
Existing hearing protection devices struggle to accurately monitor and prevent exposure to high amplitude noises, leading to potential hearing damage due to incorrect fitting or underestimation of noise exposure, which can result in premature alerts and unnecessary interruptions in work shifts.
Innovation Solution
A system comprising an acoustic barrier with a microphone for measuring sound pressure and a processor that determines the risk of exceeding a sound dose limit, providing an indication to the user to take appropriate action before reaching the limit, thereby allowing continued work while ensuring hearing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional dose meters are attached to clothes rather than embedded within an acoustic barrier, then the device can be worn comfortably, but measurement accuracy deteriorates due to increased susceptibility to mechanical noise from handling or movement
Solution Approach 1:
The patent merges the dose meter with the acoustic barrier (hearing protection device) by embedding the microphone and processing unit within the ear defender structure. This integration ensures that the measurement device remains stable and protected from mechanical noise while maintaining comfortable wear, as the user wears a single unified device rather than separate components.
Solution Approach 2:
The acoustic barrier itself serves as an intermediary structure that protects the microphone from mechanical noise while still allowing sound pressure measurement. The barrier acts as a mediator between the external noise environment and the internal measurement components, filtering out unwanted mechanical vibrations while preserving acoustic measurement capability.
2Reliability
If hearing protection devices provide strong attenuation to protect against high amplitude noises, then hearing safety is improved, but the ability to monitor actual noise exposure deteriorates due to unknown attenuation effectiveness from incorrect fitting or removal
Solution Approach 1:
The patent implements feedback by continuously measuring sound pressure inside the acoustic barrier and processing this information to determine actual noise exposure levels. The system provides real-time feedback to the user about their noise exposure status, allowing them to adjust their protection or take breaks based on actual measured conditions rather than assumed attenuation levels.
Solution Approach 2:
The patent replaces reliance on mechanical fitting checks and user self-assessment with electronic measurement and processing. Instead of depending on the user to correctly fit and wear hearing protection, the system uses a microphone and processor to objectively measure and calculate noise exposure, providing accurate determination regardless of fitting quality.
3Reliability
If hearing protection devices alert users immediately when noise limits are reached, then hearing safety is improved, but productivity deteriorates due to premature termination of work shifts
Solution Approach 1:
The patent applies preliminary action by calculating and displaying the projected noise exposure level before the actual limit is reached. The system shows users how much longer they can safely work at current noise levels, allowing them to plan their remaining work time appropriately without being forced to stop immediately when a threshold is crossed.
Solution Approach 2:
The patent introduces dynamic adjustment by continuously updating the projected exposure calculation based on real-time noise measurements and varying work conditions. The system adapts its alerts and projections to current actual conditions rather than using fixed thresholds, allowing flexible work management that maintains safety while maximizing productivity.
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 provides accurate noise exposure monitoring, reducing the risk of hearing damage by allowing users to adjust their protection and take preventative measures without interrupting their work, ensuring long-term hearing health without significantly impacting productivity.
Implementation Method 1
comprising a microphone for measuring sound pressure inside the acoustic barrier
Data Source
AI summary
A system including an acoustic barrier suitable for wearing in or on an ear of an individual mammalian subject, and a processor. The acoustic barrier defines at least one sound path therethrough and includes a microphone for measuring sound pressure inside the acoustic barrier. The processor is arranged to receive measurements from the microphone and determine a risk that a sound dose limit will be reached before a predetermined time associated with the dose limit. The system is arranged to provide an indication of the determined risk.