Hearing Aid Distance-Based Source Selection
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Solution Overview
Problem
Hearing aids struggle to effectively distinguish between wanted and unwanted acoustic signals, particularly in environments with multiple overlapping sound sources, leading to reduced speech intelligibility for hearing-impaired individuals, as existing algorithms fail to accurately determine the preferred acoustic source based on the user's intention.
Innovation Solution
A method for a hearing aid that determines the preferred acoustic source by analyzing the distance of detected speakers from the microphone system, prioritizing the source with the shortest distance and selectively amplifying it, allowing for flexible acoustic signal selection independent of geometric source distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If blind source separation algorithms are used to separate sound sources, then the ability to separate multiple acoustic sources is improved, but the ability to accurately identify the preferred acoustic source based on user intention deteriorates
Solution Approach 1:
The patent introduces an intermediary mechanism (distance measurement and selection logic) between the blind source separation algorithm and the output signal. Instead of directly using the separation results, the system measures the distance of each separated source from the microphone system and uses this intermediate information to select the preferred source, thereby recovering the user intention information that was lost in the separation process
Solution Approach 2:
The patent changes the selection criterion from relying on user intention (which is not directly measurable) to using distance as a measurable parameter. By transforming the selection basis from subjective user preference to objective distance measurement, the system can accurately identify the preferred acoustic source without directly accessing user intention information
2Measurement precision
If directional microphones are used to focus on a specific direction, then speech intelligibility in that direction is improved, but flexibility to adapt to different conversation scenarios deteriorates
Solution Approach 1:
The patent makes the acoustic focus dynamic by continuously measuring distances to multiple sound sources and selecting the closest one. Instead of fixing the directional focus in advance, the system dynamically adjusts which source receives enhanced attention based on real-time distance measurements, allowing adaptation to different conversation scenarios while maintaining speech intelligibility
Solution Approach 2:
The system achieves multi-functionality by being able to focus on any acoustic source regardless of its spatial position. The distance-based selection mechanism allows the hearing aid to universally handle different conversation scenarios (front, side, rear, moving speakers) with a single approach, eliminating the need for separate directional patterns for each scenario
3Quantity of substance
If multiple microphones are used to enable source separation, then the number of separable sources is improved, but device complexity deteriorates
Solution Approach 1:
The patent extracts the essential function needed for source selection (distance measurement) from the complex blind source separation process. By separating the distance measurement function from the source separation function and using it as an independent selection criterion, the system reduces the overall complexity while maintaining the ability to handle multiple sources
Data Source
AI summary
The invention relates to a method for operating a hearing aid. A local source operating mode is established by a signal processing section of the hearing aid for tracking and selecting a local acoustic source of an ambient sound. Electrical acoustic signals from which the local acoustic source is determined by the signal processing section are generated by the hearing aid from the detected ambient sound. The local acoustic source is selectively taken into account by the signal processing section in an output sound of the hearing aid such that the local acoustic source is at least acoustically prominent and is therefore better perceived compared to another acoustic source for a hearing aid wearer.