Earpiece Active Noise Cancellation for Explosive Sound Protection
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Solution Overview
Problem
Workers exposed to high decibel sound pressure levels face risks of temporary and permanent hearing loss due to prolonged exposure, necessitating a solution to minimize or eliminate hearing risks during occupational duties.
Innovation Solution
A wearable earpiece system with an ambient microphone and processor that detects suprathreshold sound levels, activates noise cancellation, and shuts off the microphone to prevent sound transmission, using a combination of passive and active noise cancellation methods to protect hearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the ambient microphone continuously transmits ambient signals to the speaker, then the user can hear environmental sounds, but the user is exposed to damaging high decibel sounds causing hearing loss
Solution Approach 1:
The system dynamically changes the transmission parameter of ambient sounds based on their intensity. When ambient sound levels exceed a safe threshold, the system blocks transmission to protect against hearing damage. When levels are safe, the system restores ambient sound transmission. This parameter-based control resolves the contradiction by adaptively managing sound transmission based on real-time acoustic conditions.
Solution Approach 2:
The system continuously monitors ambient sound levels through the microphone and uses this feedback to control the speaker output. The feedback loop detects high dB SPL conditions and automatically adjusts the system to block harmful frequencies, then resumes normal ambient sound transmission when conditions improve. This feedback mechanism enables dynamic resolution of the contradiction between protection and information transmission.
2Object-affected harmful factors
If the earpiece blocks all ambient sounds above a threshold, then hearing protection is provided, but the user loses awareness of environmental audio cues
Solution Approach 1:
The system applies different processing qualities to different frequency components of ambient sounds. Rather than uniformly blocking all ambient sounds above a threshold, the system specifically targets and blocks only the harmful high-frequency explosive sound components while allowing other ambient sound information to pass through. This local quality approach preserves useful ambient audio cues while eliminating damaging frequencies.
Solution Approach 2:
The system segments the ambient sound spectrum into harmful and non-harmful frequency components. The microphone captures the full ambient spectrum, the processor identifies and separates dangerous high dB SPL frequencies from safe frequencies, and the speaker system selectively blocks only the harmful segments while transmitting safe ambient sounds. This segmentation enables selective protection without complete information loss.
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
The system effectively reduces exposure to damaging sound levels by isolating the ambient environment, attenuating or blocking high decibel sounds, and resuming sound transmission when levels drop below a safe threshold, providing transient and reproducible protection against hearing damage.
Implementation Method 1
a speaker proximate the tympanic membrane and operatively connected to the processor wherein the speaker is configured to reproduce the at least one ambient signal
Implementation Method 2
an earpiece configured to isolate an ambient environment within a tympanic membrane in an ear canal
Data Source
AI summary
A system includes a first earpiece having an earpiece housing configured to isolate an ambient environment from a tympanic membrane by physically blocking ambient sound, a microphone disposed within the housing and configured to receive a first ambient audio signal from the ambient environment, a processor operatively connected to the microphone wherein the processor is configured to receive the first ambient audio signal from the microphone and determine if the first ambient signal exceeds a threshold sound level, and a speaker operatively connected to the processor. In a first mode of operation the processor determines the first ambient audio signal exceeds the threshold sound level and processes the first ambient audio signal to modify the first ambient audio signal. In a second mode of operation the processor determines the first ambient audio signal does not exceed the threshold sound level and reproduces the first ambient audio signal at the speaker.