Baffled Seal Ear Interface for Noise Attenuation and Pressure Equalization
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Solution Overview
Problem
Conventional ear-mountable listening devices, such as headphones and hearing aids, are not designed for all-day wear and fail to accurately reproduce environmental cues, leading to discomfort and difficulty in localizing sounds, with monolithic designs being non-customizable and costly to replace if damaged.
Innovation Solution
A binaural listening system with a soft ear interface that forms a baffled seal, providing high sound attenuation while allowing pressure equalization and moisture management, featuring a modular design with separable components for comfort and durability, and incorporating adaptive noise cancellation and transparency controls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional headphones or earbuds are worn to block external noise, then sound attenuation is improved, but the ability to hear environmental sounds deteriorates
Solution Approach 1:
The ear interface is segmented into multiple functional zones: a first portion that contacts the ear canal to provide acoustic sealing and noise attenuation, and a second portion that contacts the outer ear to provide structural support and housing for electronic components. This segmentation allows different regions to perform specialized functions - noise blocking where needed and environmental sound transmission where needed.
Solution Approach 2:
Different portions of the ear interface are designed with locally optimized properties: the ear canal-contacting portion uses acoustically transparent materials and open structures to allow environmental sound passage, while the outer ear portion uses solid materials for structural support and active noise cancellation components. This local quality differentiation resolves the contradiction between noise blocking and environmental awareness.
2Reliability
If monolithic hearing aid designs are used to amplify environmental sounds, then sound amplification is improved, but accurate sound localization deteriorates
Solution Approach 1:
The system separates amplification functions from localization functions through spatial segmentation of microphones and processors. Multiple microphones positioned at different locations capture spatial audio information, while separate processing circuits handle amplification and localization independently, preserving directional cues while providing gain.
Solution Approach 2:
The patent introduces intermediate processing stages that preserve spatial information while providing amplification. The system uses multiple microphones as intermediaries to capture environmental sounds with directional information, then processes these signals to maintain localization accuracy while amplifying the sound for hearing-impaired users.
3Object-affected harmful factors
If a tight seal is formed in the ear canal to block noise, then sound attenuation is improved, but pressure equalization and moisture management deteriorate
Solution Approach 1:
The ear interface uses locally differentiated acoustic properties: certain regions are designed as acoustically transparent zones with open structures or porous materials that allow air and moisture passage for pressure equalization and moisture management, while other regions provide acoustic sealing for noise attenuation. This local quality variation resolves the contradiction between noise blocking and physiological comfort.
Solution Approach 2:
The patent employs porous or permeable materials in specific regions of the ear interface to allow air and moisture transmission. These porous zones enable pressure equalization between the ear canal and external environment while maintaining sufficient acoustic sealing for noise attenuation, and facilitate moisture evaporation to prevent accumulation.
4Ease of operation
If all-day wear comfort is prioritized with open ear designs, then comfort is improved, but noise attenuation deteriorates
Solution Approach 1:
The system segments noise attenuation functions between passive acoustic sealing at the ear canal and active noise cancellation electronics at the outer ear. This allows the ear canal to remain open for comfort while electronic actuators provide the necessary noise blocking, combining comfort with attenuation.
Solution Approach 2:
The patent replaces mechanical acoustic sealing with electronic active noise cancellation in certain regions. Instead of requiring a tight physical seal for noise blocking, the system uses electronic actuators to generate anti-phase sound waves, enabling open-ear designs to maintain both comfort and noise attenuation.
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
Enables all-day wear with enhanced comfort and accurate sound localization, allowing users to block external noise or interact naturally with their environment, while the modular design allows for easy replacement of damaged parts.
Implementation Method 1
the soft ear interface forms a baffled seal with the ear when the ear-mountable listening device is inserted into the ear to provide high sound attenuation while allowing pressure equalization
Implementation Method 2
The baffle structure is configured to wick moisture and cerumen from a user's ear canal to outside of the ear canal
Data Source
AI summary
An ear-mountable listening device includes a soft ear interface, an acoustic package, and electronics. The soft ear interface is shaped to house one or more components of the ear-mountable listening device. The soft ear interface has an outer surface that contacts a canal of an ear when the ear-mountable listening device is worn by the ear. The outer surface of the soft ear interface includes a plurality of baffles to form one or more channels for air or moisture to propagate through. The one or more channels extend from between a distal end and a proximal end of the soft ear interface. The proximal end of the soft ear interface extends to at least a first bend of the canal and the distal end of the soft ear interface contacts a concha of the ear when the ear-mountable listening device is worn.