Hearing Instrument Mechanical Decoupling for Feedback Reduction
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Solution Overview
Problem
IntraEar hearing instruments face significant challenges with acoustic feedback due to their small size, leading to impaired sound quality and unpleasant shrill whistling noises, which can potentially harm users.
Innovation Solution
The hearing instrument features a mechanically decoupled design with the electronics unit in the concha section and the receiver in the canal section, utilizing multiple elastic cushioning elements to inhibit sound conduction and reduce acoustic feedback, with the electronics unit suspended via discrete cushioning elements without a fixed connection to the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the hearing instrument is designed as a small ITE device, then it provides better comfort and discretion for the user, but it becomes more susceptible to acoustic feedback
Solution Approach 1:
The housing is divided into two separate sections: a concha section containing the electronics unit and a canal section containing the receiver. This segmentation physically separates the microphone and receiver, reducing acoustic feedback while maintaining the compact ITE form factor.
Solution Approach 2:
Elastic cushioning elements are introduced as intermediary components between the electronics unit and the canal section. These cushioning elements provide mechanical decoupling that inhibits sound conduction from the receiver to the microphone, thereby reducing acoustic feedback.
2Stability of the object's composition
If the electronics unit is mechanically coupled to the housing, then structural stability is improved, but acoustic feedback increases due to sound conduction
Solution Approach 1:
Elastic cushioning elements serve as intermediary components between the electronics unit and the housing. These cushioning elements provide mechanical support while simultaneously inhibiting sound conduction, thus maintaining stability while reducing acoustic feedback.
Solution Approach 2:
The cushioning elements are made of elastic material that provides flexible mechanical coupling. This flexible connection maintains the electronics unit's stability while blocking the transmission of sound vibrations that would cause acoustic feedback.
3Object-affected harmful factors
If the receiver is separated from the electronics unit, then acoustic feedback is reduced, but device complexity increases
Solution Approach 1:
The device is segmented into two main sections (concha section and canal section) that are naturally separated by the housing structure. This segmentation reduces acoustic feedback while the modular design keeps the overall complexity manageable.
Solution Approach 2:
Elastic cushioning elements provide a simple yet effective solution for mechanical decoupling. These cushioning elements reduce acoustic feedback without requiring complex active noise cancellation systems or sophisticated control algorithms.
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 design significantly reduces the susceptibility to acoustic feedback, enhancing sound quality by preventing direct mechanical connections between the receiver and microphone, thereby minimizing unwanted noise and ensuring user safety.
Implementation Method 1
The electronics unit is mechanically coupled to the housing only by a plurality of discrete elastic cushioning elements
Implementation Method 2
The receiver is accommodated in a damping body
Data Source
Figure 1~3
Figure 4~5
Figure 6~8
AI summary
A hearing instrument (2, 2') is described, comprising a housing (4, 4') wearable in a user's ear, which has a concha section (6) and a thin canal section (8) projecting from the concha section (6). The hearing instrument (2, 2') further comprises a mechanically rigidly connected electronic unit (40) and a receiver (28). The electronic unit (40) is housed in the concha section (6) and includes a battery (30), a signal processor (32), and at least one microphone (26). The receiver (28) is housed separately from the electronic unit (40), at least partially, in the canal section (8). The electronic unit (40) is mechanically coupled to the housing (4, 4') only via a plurality of discrete elastic cushioning elements (66, 68).