Hearing Aid Directional Signal Processing for Spatial Hearing
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Solution Overview
Problem
Existing hearing aids with directional microphones struggle to provide realistic spatial hearing perception due to inadequate consideration of individual anatomical variations and limitations, leading to unnatural sound localization and impaired environmental perception.
Innovation Solution
A method for operating a hearing aid that generates directional signals by forming a first angle and angular range based on input signals from omnidirectional transducers, using superposition and time-delayed techniques to create attenuation and amplification signals, which are then combined to form an angle-weighted directional signal that accounts for user-specific anatomical peculiarities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a directional microphone is aligned in the frontal direction to suppress background noise, then the signal-to-noise ratio is improved, but the natural perception of the environment deteriorates and sound localization ability is impaired
Solution Approach 1:
The patent implements dynamic adjustment of directional characteristics by continuously tracking the user's head orientation and adjusting the beamforming weights accordingly. This allows the directional microphone to adapt its sensitivity pattern in real-time, maintaining noise suppression while preserving natural spatial perception as the user moves their head.
Solution Approach 2:
The patent applies different processing strategies to different spatial regions: strong directional suppression is applied to rear and lateral directions where noise typically originates, while frontal and temporal regions maintain broader sensitivity to preserve natural sound perception and localization cues.
2Object-affected harmful factors
If conventional directional microphony is used to suppress noise from wide angle ranges, then background noise is reduced, but sound events away from the preferred direction are masked out and cannot be localized
Solution Approach 1:
The system dynamically adjusts the directional pattern width and orientation based on the user's head movements and the spatial distribution of sound sources. When the user turns their head, the beamforming algorithm updates the directional sensitivity to maintain accurate localization while continuing to suppress noise from inappropriate directions.
Solution Approach 2:
The patent uses feedback from head tracking sensors and sound source analysis to continuously refine the directional characteristics. The system monitors the user's head orientation and adjusts the beamforming weights to maintain the preferred direction aligned with the user's line of sight, preserving localization accuracy while suppressing noise.
3Object-affected harmful factors
If directional microphony is applied frequency band by frequency, then the signal-to-noise ratio is improved across different frequencies, but the complexity of the device increases
Solution Approach 1:
The patent divides the audio spectrum into multiple frequency bands and applies independent directional processing to each band. This segmentation allows tailored optimization for different frequency ranges (e.g., broader directional patterns for low frequencies, narrower patterns for high frequencies) while managing computational complexity through efficient band-specific algorithms.
Data Source
Figure 1
AI summary
The invention relates to a method (2) for operating a hearing aid (4), wherein a first input signal (12) is generated from a sound signal (10) by a first input transducer (6), wherein a second input signal (14) is generated from the sound signal (10) by a second input transducer (8), wherein a first angle ϑ1) and an angular range (Δϑ) are specified, wherein an attenuation directional signal (28) is formed frequency-bandwise based on the first input signal (12), the second input signal (14) and the first angle (ϑ1), which has a relative attenuation at least for a second angle (ϑ2) located in the angular range (Δϑ) around the first angle (ϑ1), and thereby a superposition parameter is determined, and an amplification directional signal is generated based on the first input signal (12) and the second input signal (14) as well as the superposition parameter and/or the second angle (ϑ2). (34) is formedwhich has a relative gain for the second angle (ϑ2), from the attenuation directional signal (28) and the gain directional signal (34) an angle-emphasized directional signal (40) is generated, and an output signal (50) is generated on the basis of the angle-emphasized directional signal (40).