Hearing Aid Directional Signal Tracking Moving Speaker
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Solution Overview
Problem
Hearing aids face challenges in improving speech intelligibility in noisy environments, particularly when multiple speakers are present and the speaker is moving, as existing directional microphone algorithms struggle to adapt and robustly suppress background noise, leading to difficulties in identifying and tracking the speaker's position.
Innovation Solution
A method for a hearing aid that uses two input transducers to generate directional signals, examines signal components for a predetermined useful signal source, and adjusts the directional characteristic to enhance the signal-to-noise ratio by suppressing background noise, allowing for robust identification and tracking of the speaker's position, even when they move.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a directional microphone algorithm is applied to improve speech intelligibility by amplifying the speech signal and suppressing noises from different directions, then speech intelligibility is improved, but the algorithm becomes insufficient when the interlocutor moves relative to the user as the directional characteristic would have to be adapted continuously
Solution Approach 1:
The patent implements dynamic adaptation of the directional characteristic by continuously tracking the position of the interlocutor. The system adjusts the directional cone orientation in real-time based on detected speaker position, enabling the hearing aid to maintain optimal speech enhancement performance even when the interlocutor moves relative to the user.
Solution Approach 2:
The system employs feedback mechanisms by detecting the position of the interlocutor and using this information to adjust the directional characteristic. The position detection feedback loop enables continuous optimization of the directional cone alignment with the moving speaker, resolving the contradiction between maintaining speech intelligibility and adapting to movement.
2Reliability
If the position of the moving interlocutor is ascertained continuously to adapt the directional characteristic, then speech intelligibility is maintained, but the computational complexity increases significantly and robustness becomes a problem due to restricted resources in the hearing aid
Solution Approach 1:
The patent applies partial action by performing position detection and directional adaptation only when and where needed, rather than continuously across all possible positions. The system focuses computational resources on tracking the actual interlocutor position and adjusting the directional cone accordingly, reducing overall computational complexity while maintaining speech intelligibility.
Solution Approach 2:
The system changes operational parameters dynamically by adjusting the directional characteristic parameters (orientation, cone angle) based on the detected interlocutor position. This parameter adaptation allows the hearing aid to maintain optimal performance with varying computational demands rather than requiring maximum computational resources continuously.
3Reliability
If the directional characteristic is continuously adapted to track a moving interlocutor, then speech quality is maintained, but battery consumption increases due to the continuous processing required
Solution Approach 1:
The patent implements periodic action by updating the directional characteristic at appropriate intervals rather than continuously. The system performs position detection and directional adaptation periodically or event-driven (when position changes are detected), reducing computational load and battery consumption while maintaining speech quality through timely updates.
4Reliability
If a narrow directional cone is used to suppress background noise effectively, then signal-to-noise ratio is improved, but the ability to track a moving speaker is reduced as the narrow cone requires precise positioning
Solution Approach 1:
The patent applies dynamics by making the directional cone parameters (orientation and angular width) adjustable rather than fixed. The system dynamically adapts the cone orientation to track the moving speaker and may adjust the angular width based on tracking confidence and speech quality requirements, balancing noise suppression with tracking robustness.
Data Source
AI summary
A hearing aid includes at least a first input transducer and a second input transducer. The first input transducer generates a first input signal from a surrounding sound signal and the second input transducer generates a second input signal from the sound signal. A first direction is assigned to a first signal source. A first directional signal that is aligned in the first direction is formed on the basis of the first input signal and the second input signal. Signal components of the first directional signal are examined for the presence of a useful signal from a useful signal source that is predetermined in view of its type.