Hearing Aid Receiver Suspension for Shock and Feedback
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Solution Overview
Problem
Hearing assisting devices with hard-mounted receivers are vulnerable to mechanical shock and prone to feedback issues due to mechanical vibrations.
Innovation Solution
A hearing assisting device with a receiver suspended in a system that sets its first mechanical resonance frequency between 6 kHz and 10 kHz, utilizing a reduced vibration type receiver and a suspension with supporting ridges to minimize vibrations and enhance shock resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the receiver is hard-mounted directly to the hearing aid housing, then feedback problems are avoided, but the device becomes vulnerable to mechanical shock damage
Solution Approach 1:
The patent introduces a suspension system as an intermediary between the receiver and the hearing aid housing. This suspension comprises elastic elements that mechanically couple the receiver to the housing while providing vibration isolation. The suspension acts as a mediator that allows the receiver to be securely mounted while protecting it from mechanical shock, thus resolving the contradiction between avoiding feedback and resisting mechanical shock.
2Reliability
If the receiver is suspended to protect against mechanical shock, then resistance to shock improves, but mechanical vibrations may cause feedback
Solution Approach 1:
The patent carefully controls the mechanical parameters of the suspension system, specifically designing it to have a first resonance frequency in the range of 6 kHz to 10 kHz. By adjusting the stiffness and mass characteristics of the suspension, the resonance frequency is positioned above the critical speech frequency range (typically up to 8 kHz), thereby minimizing vibration-induced feedback while maintaining shock protection capabilities.
3Object-generated harmful factors
If a reduced vibration receiver is used to minimize feedback, then feedback risk decreases, but the device may be more vulnerable to mechanical shock
Solution Approach 1:
The patent employs a composite approach by combining a reduced vibration receiver design with a specifically engineered suspension system. The suspension uses elastic materials with tailored mechanical properties that provide both vibration isolation for feedback reduction and shock absorption for mechanical protection, creating a composite solution that addresses both requirements simultaneously.
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 configuration effectively reduces the risk of feedback while providing high resistance to mechanical shock, ensuring the receiver's stability and reliability.
Implementation Method 1
arrange a receiver for a hearing assistive device, such as a hearing aid, in a suspension in order to dampen mechanical vibrations from the receiver housing and thereby reducing any feedback to the microphone
Implementation Method 2
the first mechanical resonance frequency of the receiver in the suspension is in the range 6 kHz to 10 kHz
Data Source
AI summary
A hearing assisting (10) device including a receiver (1) for generation of acoustic signals and a fixture (3, 8, 9) for positioning the receiver. A suspension (2, 21, 22) supports the receiver to the fixture. The combination of the receiver and the suspension has a mechanical resonance frequency in the range from 6 kHz to 10 kHz.