Integrated Inductive Element Speaker Assembly for Hearing Aid Compatibility
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Solution Overview
Problem
Hearing aid users experience audible interference due to Electromagnetic Interference (EMI) from digital wireless phones, which can render phone usage unusable, especially when using telecoil mode for inductive coupling, as existing wireless handsets do not adequately provide sufficient magnetic flux for effective inductive coupling.
Innovation Solution
A speaker assembly with an integrated inductive element is designed to enhance magnetic coupling by including a diaphragm, transducer, and an integrated inductive element within the wireless device, which increases the inductive field strength and orientation to maximize coupling with hearing aids, thereby reducing EMI interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional speaker is used in a wireless phone, then the device complexity is low, but the magnetic flux strength is insufficient for effective telecoil coupling
Solution Approach 1:
The patent combines the speaker coil and telecoil into a single integrated assembly. The speaker coil serves dual purposes: generating acoustic output and creating magnetic flux for telecoil coupling. This merging eliminates the need for a separate telecoil component while providing sufficient magnetic flux strength for hearing aid compatibility.
Solution Approach 2:
The speaker coil is designed to perform multiple functions simultaneously: it acts as both the acoustic transducer coil and the magnetic flux source for telecoil operation. This multi-functionality allows the single component to satisfy both speaker performance requirements and hearing aid coupling requirements without adding additional components.
2Adaptability or versatility
If digital wireless phone components are used, then the functionality is enhanced, but Electromagnetic Interference (EMI) is generated that affects hearing aid users
Solution Approach 1:
The patent extracts and separates the telecoil coupling function from the general EMI-generating components. By integrating the telecoil with the speaker assembly and positioning it to utilize the speaker coil's magnetic flux, the design isolates the hearing aid coupling function from the EMI generated by other digital phone components such as the RF transmitter, display, and keypad.
Solution Approach 2:
The integrated telecoil assembly acts as an intermediary between the speaker coil and the hearing aid telecoil. It captures the magnetic flux from the speaker coil and transmits it inductively to the hearing aid, while being positioned and shielded to minimize pickup of EMI from other phone components.
3Strength
If the telecoil is placed close to the speaker coil, then the magnetic coupling is enhanced, but the EMI pickup increases
Solution Approach 1:
The patent applies local quality by creating a localized magnetic flux environment. The integrated telecoil is positioned to capture magnetic flux specifically from the speaker coil region, while the overall assembly geometry and shielding are designed to exclude EMI from other components. This localized coupling approach allows close proximity for strong coupling while maintaining EMI rejection through selective flux capture.
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 enhanced magnetic coupling significantly reduces audible interference, improving communication quality for hearing aid users by increasing the strength of the inductive signal and minimizing EMI effects, thus meeting FCC requirements for Hearing Aid Compatibility (HAC) ratings.
Implementation Method 1
an integrated inductive element that is electrically connected to the transducer... the inductive element is oriented to magnetically couple with an external telecoil
Implementation Method 2
a permanent magnet wound by a coil, where the permanent magnet causes the diaphragm to generate sound
Data Source
AI summary
A speaker assembly, a method for manufacturing a speaker assembly and a wireless device are provided. Such a speaker assembly may include a diaphragm for generating sound, a transducer for causing the diaphragm to generate sound and an integrated inductive element that is electrically connected to the transducer. The diaphragm, transducer and integrated inductive element are contained within the speaker assembly.