Dual-Microphone Earpiece for Noise Exposure Event Recording
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Solution Overview
Problem
There is a need to accurately assess and record sound exposure levels in various environmental settings, particularly in industrial environments where workers are exposed to high noise levels, and existing technologies do not provide reliable indications of noise exposure, which can lead to hearing damage and compromised attention due to media devices.
Innovation Solution
A device comprising multiple earpieces with Ambient Sound Microphones and Ear Canal Microphones that record sound pressure levels and internal sounds, using a processor to save histories of ambient and internal sounds, and trigger events such as changes in sound pressure or movement, allowing for binaural recording and data compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If earplugs are used to suppress noise, then hearing protection is improved, but accurate indication of noise exposure is lost
Solution Approach 1:
A sound level indicator device is introduced as an intermediary between the noisy environment and the user's perception. The device includes a microphone that captures ambient sound, a sound level indicator that displays noise exposure levels, and can work in conjunction with earplugs to provide both protection and accurate feedback about noise exposure without being blocked by the earplugs themselves
2Adaptability or versatility
If media devices deliver audio to the ear, then entertainment is improved, but attention to environmental sounds is compromised
Solution Approach 1:
The patent combines multiple functions into a single earpiece device: audio playback capability, ambient sound capture via microphone, and sound level indication. This allows the device to simultaneously deliver entertainment audio while monitoring and indicating environmental noise levels, merging the beneficial aspects of media delivery with environmental awareness
Solution Approach 2:
The device incorporates feedback mechanisms where the captured ambient sound and measured sound levels are processed and presented to the user through visual or auditory feedback, allowing users to remain aware of their environmental acoustic context even while using media playback functions
3Reliability
If continuous recording is implemented, then complete sound history is captured, but memory capacity is consumed rapidly
Solution Approach 1:
Instead of continuously recording all audio data, the system selectively records only when sound levels exceed predetermined thresholds or when specific acoustic events occur. This partial recording approach maintains reliable sound exposure assessment for hazardous conditions while dramatically reducing memory consumption by avoiding storage of normal, non-critical audio periods
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 device effectively records and monitors sound exposure levels, providing accurate data on sound pressure and internal sounds, reducing hearing damage risk and enhancing user awareness of environmental noise, while also enabling audio content delivery and forensic analysis.
Implementation Method 1
an Ambient Sound Microphone (ASM) to capture ambient sound in the environment
Implementation Method 2
an Ear Canal Microphone (ECM) to capture internal sound in the ear canal
Implementation Method 3
The processor can monitor the ambient sound for a Sound Pressure Level (SPL) change
Data Source
AI summary
An earpiece (100) is provided. The earpiece can include an Ambient Sound Microphone (111) configured to capture ambient sound, an Ear Canal Microphone (123) configured to capture internal sound in the ear canal, a memory (208) configured to record at least a portion of the history of the ambient sound and the internal sound, and a processor (121) configured to save a recent portion of the history responsive to an event.