Suspended Microphone in Hearing Devices for Housing Vibration Feedback
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Solution Overview
Problem
Hearing devices experience feedback signals from housing vibrations that compromise sound quality, leading to discomfort and reduced stability due to acoustical and mechanical feedback loops.
Innovation Solution
A hearing device with a suspended microphone system featuring a suspension element and a fundamental resonance frequency of 0.5-5 kHz, which reverses the phase of vibrational feedback signals to cancel out acoustic feedback and attenuates vibrational feedback, improving sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the microphone device is rigidly mounted in the housing, then structural stability is improved, but feedback signals from housing vibrations are increased
Solution Approach 1:
The microphone device is separated from the housing by the suspension element, creating an independent suspended system that isolates the microphone from housing vibrations while maintaining overall structural integrity
Solution Approach 2:
The suspension element acts as an intermediary component between the housing and microphone device, providing mechanical coupling while filtering out harmful vibration frequencies through its specific resonance characteristics
2Reliability
If traditional sealing methods (compressed foam) are used for the microphone, then sealing is achieved, but complexity and difficulty of assembly increase
Solution Approach 1:
The suspension element itself provides sealing functionality through its flexible membrane structure, eliminating the need for separate compressed foam sealing components and simplifying the overall assembly process
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 suspension element reduces feedback signals by 6 dB/octave above the fundamental resonance frequency, enhancing sound quality and stability by minimizing whistling and feedback-related discomfort.
Implementation Method 1
the phase of a vibrational feedback signal from the housing of the hearing device can be reversed. Reversing the phase of the vibrational feedback signal introduces a cancelation to an acoustic feedback signal
Implementation Method 2
the suspension element introduces an attenuation of the vibrational feedback corresponding to for example 6 dB/octave above the fundamental resonance frequency
Data Source
AI summary
A hearing device includes a microphone device for provision of a microphone input signal, the microphone device comprising a membrane. The hearing device comprising a processor for processing the microphone input signal and providing an electrical output signal based on the microphone input signal. The hearing device comprising a receiver for converting the electrical output signal to an audio output signal. The hearing device comprising a printed circuit board. The hearing device comprising one or more housings, wherein the microphone device is arranged in a first housing of the one or more housings. The hearing device comprising a suspension element for suspending the microphone device in the first housing. The suspension element may have a first end connected to the first housing and a second end connected to the microphone device. The suspension element and the microphone device may have a fundamental resonance frequency in the range of 0.5-5 kHz.