Hearing Device Fluid Damping Mat Reduces Loudspeaker Feedback
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Solution Overview
Problem
High-performance loudspeakers in hearing devices often experience pumping effects in flexible sound conducting elements, leading to reduced gain and potential feedback issues due to structure-borne and airborne sound.
Innovation Solution
A hearing device with a housing containing a loudspeaker and a damping element, specifically a fluid-filled damping mat, interposed between the loudspeaker and the housing wall, which absorbs vibrations and reduces the transmission of vibrations to other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible sound conducting element is used to connect the loudspeaker to the sound outlet, then the sound can be transmitted effectively, but pumping effects occur that reduce achievable gain and cause feedback
Solution Approach 1:
A damping element is introduced as an intermediary component between the loudspeaker and the housing wall. This damping element absorbs vibrations and shocks generated by the loudspeaker, preventing them from being transmitted to the housing and subsequently to the microphone through the flexible sound conducting element, thereby eliminating pumping effects and feedback while maintaining sound transmission quality
Solution Approach 2:
The vibrations and shocks generated by the loudspeaker, which originally cause harmful pumping effects, are converted into a beneficial damping action. The damping element absorbs these vibrations and dissipates them as heat through viscous damping in the fluid-filled chambers, transforming the harmful mechanical energy into thermal energy and preventing feedback
2Power
If powerful loudspeakers are used to compensate for severe hearing loss, then high sound pressure level is achieved, but structure-borne sound affects other components
Solution Approach 1:
The damping element serves as a mediator between the powerful loudspeaker and the housing structure. It absorbs the mechanical vibrations and shocks generated by the high-power loudspeaker before they can be transmitted to the housing wall and other components, allowing high sound pressure level operation without affecting sensitive components
Solution Approach 2:
The harmful structure-borne sound vibrations are extracted from the system by the damping element, which isolates them from the housing and other components. The damping element absorbs and dissipates these vibrations, separating the useful acoustic output from the harmful mechanical vibrations
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 damping element effectively reduces vibrations and movements of the loudspeaker, thereby minimizing feedback and maintaining high gain levels, especially in BTE hearing aids.
Implementation Method 1
a damping element formed by a damping mat, i.e. having at least one of these, which is interposed between the loudspeaker and a wall of the housing or a loudspeaker box
Implementation Method 2
The damping mat contains at least one damping chamber filled with fluid
Data Source
AI summary
A hearing device containing a housing enclosing a housing interior, and a loudspeaker for generating acoustic signals. In addition, the hearing device contains a damping element formed by a damping mat, which is interposed between the loudspeaker and a wall of the housing or a loudspeaker box. The damping mat contains at least one damping chamber filled with fluid.