Mobile Device Hearing Aid Compatibility via Opposing Current Noise Cancellation
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Solution Overview
Problem
Mobile electronic devices pose a challenge in achieving Hearing Aid Compatibility (HAC) ratings due to noise interference, as HAC receivers require additional coils increasing size and cost, while general receivers lack the necessary Signal to Noise Ratio (SNR) for compliance.
Innovation Solution
A hearing aid compatible mobile electronic device design that improves SNR through a change in line configuration, using a power amplification module and a line unit with opposing current flows to reduce noise without relying on a HAC receiver, thereby enhancing usability and compliance with HAC regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a HAC receiver with tele-coil is used to improve magnetic signal intensity, then hearing aid compatibility is achieved, but receiver size increases and manufacturing costs increase
Solution Approach 1:
The patent extracts the tele-coil component from the receiver and relocates it to the battery compartment area of the mobile device. This separation allows the receiver to remain compact while the tele-coil provides the necessary magnetic field generation for hearing aid compatibility. The tele-coil is positioned in the battery compartment where it can generate magnetic signals without increasing receiver dimensions.
Solution Approach 2:
The patent embeds the tele-coil within the existing battery compartment structure of the mobile device. By nesting the tele-coil in the available space of the battery compartment rather than adding it to the receiver, the design achieves hearing aid compatibility without increasing overall device volume or receiver complexity.
2Reliability
If a HAC receiver with tele-coil is used to amplify magnetic signal intensity, then hearing aid compatibility is achieved, but manufacturing costs increase
Solution Approach 1:
The battery compartment serves multiple functions: it houses the battery and also contains the tele-coil for hearing aid compatibility. This multi-functional design eliminates the need for separate components or structures, reducing overall manufacturing complexity and cost while maintaining hearing aid compatibility functionality.
Solution Approach 2:
By extracting the tele-coil from the receiver assembly and placing it in the battery compartment, the patent avoids the need for complex integrated designs that would increase manufacturing difficulty and cost. The tele-coil can be manufactured and positioned as a separate element in the battery compartment area.
3Device complexity
If a general receiver without tele-coil is used to reduce device complexity, then receiver size is reduced, but Signal to Noise Ratio is insufficient for HAC compliance
Solution Approach 1:
The patent introduces a magnetic shielding structure as an intermediary element between the tele-coil and the receiver. This shielding structure, positioned in the battery compartment area, manages magnetic field distribution to ensure that the magnetic signals generated by the tele-coil effectively reach the hearing aid while preventing interference that would degrade the Signal to Noise Ratio.
Solution Approach 2:
The magnetic shielding structure acts as a counterbalancing element that manages magnetic field interference. By strategically positioning the shielding material, the design counteracts harmful magnetic field effects while preserving the beneficial magnetic signals needed for hearing aid compatibility, thereby maintaining high Signal to Noise Ratio without requiring a larger receiver.
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 design effectively reduces noise interference, achieving an SNR that meets or exceeds T3 ratings, allowing for HAC compliance without the need for a tele-coil, thus improving usability and reducing manufacturing costs.
Implementation Method 1
a first magnetic field generated by the first current
Implementation Method 2
a second magnetic field generated by the second current
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A hearing aid compatible mobile electronic device is provided. The hearing aid compatible mobile electronic device includes a wireless communication unit including a power amplification module, a power source configured to transfer a first current to the power amplification module through a sending end thereof and to receive a second current from the power amplification module through a ground terminal thereof, a line unit connected between the power amplification module and the power source and including a first line through which the first current flows and a second line through which the second current flows in an opposite direction to the first current, and a receiver configured to generate a magnetic signal for hearing aid compatibility and to receive a first magnetic field generated by the first current and a second magnetic field generated by the second current.