Adaptive Hearing Protection Dynamic Noise Attenuation

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Solution Overview

Problem

Conventional hearing protection systems often diminish too much sound, making it difficult for users to hear important noises or conversations in loud environments, while also failing to provide adequate protection from high-amplitude sounds like gunshots.

Innovation Solution

An adaptive hearing protection system with microphones, a peak detector, and adjustable filters that sense high-amplitude sounds and attenuate noise, allowing for enhanced protection and increased intelligibility of voice signals by modifying signal processing based on noise levels and voice detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If conventional hearing protection systems attenuate sound to protect hearing, then hearing protection is provided, but important noises and conversations become difficult to hear

Engineering Contradiction:

Improvehearing protection from loud noisesVSAvoidintelligibility of important sounds

Core Design Contradiction:

Object-affected harmful factorsVSLoss of information

Solution Approach 1:

The hearing protection system dynamically adjusts attenuation levels based on real-time analysis of sound characteristics. The system transitions from static attenuation to dynamic adaptation by continuously monitoring input signals and modifying protection levels according to whether sounds are classified as harmful impulses or important conversational audio.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system applies different attenuation characteristics to different frequency ranges and sound types. By analyzing spectral content and temporal patterns, the system provides selective attenuation that preserves important frequency bands while blocking harmful noise, rather than applying uniform attenuation across all sounds.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If hearing protection attenuates all loud sounds, then hearing is protected, but the wearer is left out of critical sound information

Engineering Contradiction:

Improveprotection from high amplitude soundsVSAvoidability to hear conversations and commands

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The system incorporates feedback mechanisms where the output is monitored and used to adjust subsequent processing. By analyzing the characteristics of sounds that pass through the protection system, the algorithm adapts its attenuation pattern to ensure important sounds remain audible while maintaining protection levels.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs preliminary classification of incoming sounds before applying attenuation. By pre-identifying sounds as either harmful impulses or important audio based on their characteristics, the system can apply appropriate processing in advance, ensuring important sounds are preserved before attenuation occurs.

Inventive Principle:

Principle #10Preliminary action

3Stability of the object's composition

If uniform attenuation is applied to all noises, then hearing protection is consistent, but voice intelligibility decreases in noisy environments

Engineering Contradiction:

Improveconsistency of protectionVSAvoidvoice signal intelligibility

Core Design Contradiction:

Stability of the object's compositionVSLoss of information

Solution Approach 1:

The system changes multiple parameters including attenuation level, frequency response, and time constants based on the detected sound environment. By dynamically adjusting these parameters according to whether the environment contains speech, music, or harmful impulses, the system maintains both protection consistency and audio intelligibility.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11504278B2Adaptive electronic hearing protection device

Publication Date: 2022.11.22 3M INNOVATIVE PROPERTIES CO

AI summary

An electronic hearing protection device is provided. The electronic hearing protection device includes an amplifier and a speaker to relay sounds, such as conversations, to the user of the hearing protection. The hearing protection device provides adaptive gunshot recognition and suppression technology.