Shared Voice Coil for Hearing Aid Compatibility in Mobile Devices
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Solution Overview
Problem
Cellular device manufacturers face challenges in incorporating hearing aid compatibility (HAC) components within a small form factor while meeting magnetic field and volume requirements, which can lead to increased device size and complexity.
Innovation Solution
A mobile wireless communications device with a shared voice coil that functions as both an autofocus mechanism for the camera and a magnetic output for HAC compliance, eliminating the need for a dedicated HAC coil, thereby conserving space and potentially reducing component costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dedicated HAC coil is added to provide hearing aid compatibility, then HAC compliance is improved, but device complexity and form factor increase
Solution Approach 1:
The patent combines the HAC coil functionality with the existing receiver coil by making the receiver coil serve dual purposes: receiving wireless signals and providing magnetic field output for hearing aid compatibility. This merging eliminates the need for a separate dedicated HAC coil, thereby reducing device complexity while maintaining HAC compliance.
Solution Approach 2:
The receiver coil is designed to perform multiple functions: it acts as both the wireless signal receiver and the magnetic field generator for hearing aid compatibility. This multi-functionality allows a single component to satisfy both communication and HAC requirements, reducing the overall component count and device complexity.
2Adaptability or versatility
If a dedicated HAC coil is added to provide hearing aid compatibility, then HAC compliance is improved, but device form factor increases
Solution Approach 1:
The patent merges the HAC coil functionality into the existing receiver coil structure, eliminating the need for additional space. By making the receiver coil serve dual purposes, the device form factor is preserved while still achieving HAC compliance.
Solution Approach 2:
The receiver coil is designed with multi-functionality to handle both wireless signal reception and magnetic field generation for hearing aids. This universal component approach avoids adding extra volume to the device while maintaining all required functionalities including HAC compliance.
3Device complexity
If the voice coil is shared for autofocus and HAC functions, then device complexity is reduced, but functional reliability may be affected
Solution Approach 1:
The patent implements dynamic control of the shared voice coil through a controller that adjusts the coil's function based on operational mode. The controller switches between autofocus mode and HAC mode as needed, allowing the same physical component to reliably perform different functions at different times without interference.
Solution Approach 2:
The system changes operational parameters of the voice coil (such as drive signal characteristics) depending on whether it is being used for autofocus or HAC functions. By adjusting parameters like signal frequency and amplitude based on the active function, the system maintains reliable performance for both purposes despite sharing the same hardware.
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 solution achieves HAC compliance without increasing the device's form factor, allowing for efficient image capture and audio functionality while ensuring compatibility with hearing aids, thus addressing the space and cost constraints faced by manufacturers.
Implementation Method 1
a voice coil... for generating a magnetic field... to permit coupling with hearing aids that contain telecoils
Implementation Method 2
a coil converts the amplified electric signal into a corresponding magnetic signal
Data Source
AI summary
A mobile wireless communications device is for use with a hearing aid including a hearing aid compatible (HAC) coil. The device may include a portable housing and a wireless receiver carried by the portable housing. The device may also include at least one image capture component and a positioning coil associated therewith and carried by the portable housing. A controller may also be carried by the portable housing for selectively operating the positioning coil for image capture, and for inductively coupling received signals from the wireless receiver to the HAC coil.