Bone Conduction Hearing Aid Microphone Layout for Vibration Cancellation
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Solution Overview
Problem
Bone conduction hearing aid devices experience interference from housing vibration affecting microphone sound pickup, leading to noise and increased howling.
Innovation Solution
The microphone is redesigned to be positioned on the connecting side surface between the outer and inner side surfaces of the mounting part, where vibrations cancel each other out, reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the microphone is positioned on the outer side surface of the mounting part, then the sound pickup is easier to implement, but the housing vibration causes interference and noise in the sound pickup
Solution Approach 1:
The patent utilizes the vibration cancellation effect created by the dipole pair (outer side surface and inner side surface vibrating in opposite phase) to eliminate harmful vibration interference at the connecting side surface, where the microphones are positioned. This converts the harmful vibration into a beneficial cancellation zone.
Solution Approach 2:
The connecting side surface acts as an intermediary zone between the outer side surface and inner side surface. By positioning microphones on this connecting side surface, the patent creates a intermediate position where vibration interference is minimized due to the opposing vibrations from both surfaces.
2Object-affected harmful factors
If the microphone is positioned on the inner side surface of the mounting part, then the vibration interference is reduced, but the sound pickup directionality is compromised
Solution Approach 1:
Instead of positioning microphones on traditional flat surfaces (outer or inner side surfaces), the patent positions them on the connecting side surface, which is a different dimensional orientation. This connecting side surface is formed by the intersection of the outer and inner side surfaces, creating a new spatial dimension for microphone placement with unique vibration characteristics.
3Measurement precision
If multiple microphones are positioned at different locations, then the noise reduction effect is improved, but the device complexity increases
Solution Approach 1:
The patent divides the sound pickup function across multiple microphones positioned at different locations on the connecting side surface. By segmenting the microphone array into multiple elements, the system can process and compare signals from different positions to achieve better noise reduction while maintaining a relatively simple overall structure.
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 significantly reduces vibration interference and improves the noise reduction effect of sound pickup, enhancing the auditory experience for hearing-impaired users.
Implementation Method 1
During the vibration of the first mounting part, the outer side surface and the inner side surface of the first mounting part vibrate and generate sound waves with identical amplitude and frequency but opposite phase, thereby forming a dipole pair
Implementation Method 2
An effect of sound wave 'cancellation' is formed on the connecting side surface between the outer side surface and the inner side surface
Data Source
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AI summary
The present disclosure provides a bone conduction hearing aid device, including: a support structure including a rear hanging part 11, ear hanging parts, first mounting parts, and second mounting parts 14, wherein two ends of the rear hanging part 11 are respectively connected to one first mounting part, and each of the first mounting parts 13 is connected to one second mounting part via one ear hanging part; a speaker mounted in the second mounting part, wherein the speaker is configured to play a hearing aid sound signal; a plurality of microphones disposed on the connecting side surface, wherein the plurality of microphones are configured to receive a sound signal and convert the sound signal into an electric signal. During vibration of the first mounting part, the outer side surface and the inner side surface of the first mounting part vibrate and generate sound waves with identical amplitude and frequency but opposite phase, thereby forming a dipole pair. An effect of sound wave "cancellation" is formed on the connecting side surface between the outer side surface and the inner side surface. Disposing the plurality of microphones on the connecting side surface of the first mounting part can reduce the interference of vibration of the first mounting part on sound pickup by the microphone and improve the noise reduction effect of sound pickup by the microphone.