Hearing Assistive Attachment Sensing for Automatic Beamforming Mode Switch
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Solution Overview
Problem
Existing hearing assistive devices struggle to adapt their sound pickup mode effectively between directional and omni-directional responses based on the intended use, whether attached to a user or placed on a surface, without manual intervention.
Innovation Solution
A hearing assistive device with a clip-like attachment element that switches between mechanical and electrical states, allowing automatic mode selection based on attachment to a user or a surface, using a microphone array that adjusts processing accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hearing assistive device uses a fixed directional processing mode, then the signal-to-noise ratio is improved when attached to a user, but the device cannot adapt when placed on a surface requiring omni-directional response
Solution Approach 1:
The patent implements dynamic mode switching by detecting whether the attachment element is attached to a user or placed on a surface. The system automatically transitions between directional processing mode (when attached to user) and omni-directional processing mode (when placed on surface), allowing the device to adapt its signal processing characteristics based on the operational context rather than being fixed in one mode
Solution Approach 2:
The system uses feedback from attachment detection (through electrical contact sensing between the attachment element and the device housing) to automatically adjust the signal processing mode. This closed-loop approach ensures the device maintains optimal performance by continuously monitoring its attachment state and adjusting processing accordingly
2Reliability
If the device manually switches between modes, then the processing can be optimized for specific use cases, but the user convenience is reduced due to manual intervention requirements
Solution Approach 1:
The device performs self-service by automatically detecting its attachment state and switching between processing modes without requiring user input. The attachment element's electrical contact status triggers automatic mode selection, eliminating the need for manual mode switching while maintaining optimal processing for each use scenario
3Ease of operation
If the attachment element is designed with mutually movable mechanical parts, then the gripping capability is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into the attachment element: mechanical gripping (through mutually movable parts that can clamp onto clothing) and electrical sensing (through conductive elements that detect attachment state). This merging allows the single component to provide both secure attachment and automatic mode triggering without requiring separate mechanisms
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
Enables automatic switching between directional and omni-directional modes, enhancing sound quality by adapting to the user's intended use, whether attached to a person or placed on a surface, thereby improving signal-to-noise ratio and user convenience.
Implementation Method 1
a scheme for adjusting signal processing in the hearing assistive device based on the use of the attachment element... monitoring a current flowing through said first and second mutually movable mechanical parts
Data Source
AI summary
Disclosed herein are embodiments of a hearing assistive device including a multi-microphone system for providing a processed input signal. The multi-microphone system includes a multitude of microphones for picking up sound from an environment; and a beamformer filter. The hearing assistive device further includes an attachment element configured to fix the hearing assistive device to the body or clothes of a person. The multi-microphone system is configurable to operate in at least two modes in dependence of a mode control signal, A) a directional mode and B) an omni-directional mode wherein said multi-microphone system is configured to provide said processed input signal as a substantially directional signal, and as a substantially omni-directional signal, respectively. The attachment element is configured to provide an electric signal indicative of a current state of the attachment element. The hearing assistive device further includes a mode controller for providing said mode control signal in dependence of said electric signal indicative of a current state of the attachment element.