Hearing Aid Signal Processing for Acoustic Source Selection
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Solution Overview
Problem
Hearing aids struggle to effectively distinguish between wanted and unwanted acoustic signals, particularly in noisy environments, leading to ambiguity in source selection and restricted user freedom, as existing algorithms rely on assumptions about the user's intention and direction of sound.
Innovation Solution
A method allowing the hearing aid wearer to actively select and prioritize acoustic signals through a 'hold' command, using a signal processing section with a blind source separation module, enabling intuitive selection and tracking of preferred sounds independent of user movement or direction, with options for simple or intelligent tracking and automatic release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing algorithms are used to minimize interference noise, then noise reduction is achieved, but the ability to distinguish between spoken language and background noise is lost when they are within the same frequency region
Solution Approach 1:
The patent introduces spatial dimension (directionality) as an additional parameter for signal separation. By using multiple microphones arranged in specific geometries and applying beamforming techniques, the system creates directional sensitivity patterns that enable discrimination between speech and noise based on their spatial origins, not just frequency characteristics.
Solution Approach 2:
The patent divides the acoustic signal processing into multiple independent frequency bands using filter banks. Each band can be processed separately with different beamforming weights and directional characteristics, allowing selective enhancement of speech frequencies while suppressing noise in other bands, thereby maintaining both noise reduction and signal distinction.
2Device complexity
If algorithms assume fixed user intention and direction of sound, then source selection is simplified, but user freedom of movement is restricted
Solution Approach 1:
The patent implements dynamic beamforming where the directional sensitivity patterns are continuously adapted based on real-time speech activity detection and user head position tracking. The system automatically adjusts the main lobe direction and width of the beamforming pattern to follow the user's gaze and head orientation, maintaining optimal speech enhancement without requiring fixed positional assumptions.
Solution Approach 2:
The system incorporates feedback loops that continuously monitor the acoustic environment, detect speech sources, and adjust beamforming parameters in real-time. Speech activity detectors provide feedback about the presence and location of speakers, which feeds back to the beamforming algorithm to dynamically reconfigure the directional patterns, enabling the system to adapt to moving users and changing environments.
3Quantity of substance
If blind source separation is used to separate multiple sound sources, then source separation capability is improved, but ambiguity in selecting the wanted signal increases
Solution Approach 1:
The patent adds spatial dimension to the blind source separation process by combining it with directional microphone arrays and beamforming. Instead of relying solely on statistical properties of the signals, the system uses spatial information from multiple microphone channels to separate sources, providing both separation and directional localization that helps the user identify which separated signal corresponds to the desired speaker.
Data Source
AI summary
The invention relates to a method for a hearing aid wearer to actively operate a hearing aid. A signal processing section of the hearing aid has a demixing module for separating audio signals and a postprocessor module which sets up a hold mode of operation for the hearing aid. An audio signal, which is preferred by the hearing aid wearer, from an ambient sound, is tracked and selected by virtue of the hearing aid wearer transmitting to the hearing aid a command which sets up the hold mode of operation in the signal processing section of the hearing aid for a certain period. The signal processing section tracks the preferred audio signal and selectively takes account of it in an output sound from the hearing aid such that it is audibly highlighted for the hearing aid wearer in comparison with another audio signal and is thereby perceived better.