Concha-Inserted Hearing Aid Resonance Feedback Reduction
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Solution Overview
Problem
Conventional hearing aids often cause discomfort and distortion for individuals with high frequency hearing loss due to over-amplification and occlusion effects, as they typically block the ear canal and amplify sound unnaturally, making it difficult to localize sound sources and recognize one's own voice.
Innovation Solution
A passive device is inserted into the outer ear concha, utilizing natural frequency resonance to provide selective or broad-frequency gain at higher frequencies, allowing for electronic amplification without sealing the ear canal, using strategically positioned transducers and Fourier analysis to enhance speech comprehension without feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional hearing aids amplify high frequency sounds to compensate for hearing loss, then speech comprehension is improved, but feedback and whistling occur due to sound returning to the microphone
Solution Approach 1:
The invention extracts the amplifying transducer from the ear canal and relocates it to the concha (outer ear), removing the source of feedback while maintaining amplification function. This spatial separation prevents the amplified sound from returning to the microphone, eliminating the feedback loop that causes whistling.
Solution Approach 2:
The invention transitions from one-dimensional sound amplification within the ear canal to utilizing the three-dimensional resonance cavity of the concha. By positioning the transducer in the concha, the system exploits the natural acoustic properties of the outer ear structure to achieve frequency enhancement without the feedback problems of canal-based devices.
2Power
If the ear canal is sealed to prevent feedback, then amplification gain is improved, but natural hearing and sound localization are degraded
Solution Approach 1:
The invention removes the occluding ear canal seal entirely by relocating the transducer to the concha. This extraction eliminates the occlusion effect while maintaining the ability to provide amplification, allowing natural sound waves to pass through the ear canal unimpeded and preserving the user's ability to localize sound sources.
Solution Approach 2:
The concha acts as an intermediary structure between the external environment and the ear canal. By positioning the transducer in the concha, the system uses this natural acoustic cavity to mediate sound delivery, providing amplification without blocking the ear canal and thus maintaining natural hearing properties.
3Loss of information
If high gain amplification is applied to compensate for high frequency hearing loss, then speech comprehension is improved, but distortion and over-amplification of background noise occur
Solution Approach 1:
The invention applies local quality enhancement by utilizing the natural resonance properties of the concha cavity to selectively amplify specific frequency ranges. The concha's acoustic characteristics provide frequency-dependent gain, enhancing speech frequencies while naturally limiting the amplification of background noise, thus avoiding distortion and over-amplification.
Solution Approach 2:
The invention changes the acoustic parameters of the system by utilizing the concha's natural resonance frequencies. This passive acoustic filtering provides frequency-selective amplification without requiring electronic processing, thereby avoiding the distortion and noise amplification problems associated with electronic frequency processing.
4Power
If the ear canal is blocked by the hearing aid, then amplification is improved, but the occlusion effect increases loudness of some frequencies making sounds unnatural
Solution Approach 1:
The invention extracts the transducer from the ear canal to eliminate the occlusion effect. By placing the amplifying element in the concha rather than blocking the ear canal, the system maintains natural sound transmission through the canal while still providing amplification, thus avoiding the unnatural loudness and discomfort caused by occlusion.
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 improves speech comprehension and reduces amplification levels, allowing for natural hearing of high-frequency sounds without discomfort, feedback, or distortion, making it suitable for individuals with high frequency hearing impairment.
Implementation Method 1
a passive device that may be inserted into the outer ear concha or pinna, and used with or without additional electronic amplification, to provide selective or broad-frequency gain at higher frequencies due to natural frequency resonance by the outer ear passages
Data Source
AI summary
A hearing enhancement device using wave amplification in the outer ear cavities of a user and transducer placement to provide frequency based enhancement of speech and music sounds without blocking the user's auditory canal.