Hearing Aid Matched Filter for Diffuse Noise Localization
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Solution Overview
Problem
Hearing aid users face difficulties in localizing sound sources and following conversations in noisy environments due to internalized sound reproduction, which leads to listening fatigue and reduced spatial awareness, especially in complex listening situations with diffuse noise.
Innovation Solution
A method involving a microphone system with matched filters that match the sound propagation transfer function, enhancing the signal-to-noise ratio by filtering audio signals to compensate for amplitude and phase changes, and combining signals to improve sound localization while preserving spatial awareness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If directional systems are applied to suppress diffuse noise, then signal-to-noise ratio is improved, but spatial awareness is lost
Solution Approach 1:
The patent applies parameter changes by using matched filtering with transfer functions that match the sound propagation path characteristics. This changes the signal processing parameters to enhance the signal-to-noise ratio while preserving spatial information, resolving the contradiction between noise suppression and spatial awareness maintenance.
2Measurement precision
If hearing aids reproduce sound internally, then speech intelligibility is improved, but cognitive loading increases and listening fatigue occurs
Solution Approach 1:
The patent employs feedback mechanisms through the matched filtering process, where the system continuously adjusts signal processing based on the sound propagation characteristics. This feedback approach maintains speech intelligibility while reducing cognitive loading by optimizing the naturalness of sound reproduction.
3Measurement precision
If multiple microphones are added to suppress diffuse noise, then noise suppression capability is improved, but device complexity increases
Solution Approach 1:
The patent substitutes mechanical approaches (adding more microphones) with signal processing approaches (matched filtering). This replaces the need for additional physical sensors with computational methods that achieve noise suppression through mathematical operations on existing signals.
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
The solution effectively improves the signal-to-noise ratio and enhances sound localization, reducing listening fatigue and maintaining environmental awareness in noisy environments, thereby improving the hearing aid user's ability to focus on specific sound sources.
Implementation Method 1
filtering the audio signal with a matched filter having a matching transfer function that matches or substantially matches a transfer function of a sound propagation path
Data Source
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AI summary
A hearing aid is provided, comprising: a first microphone system configured for conversion of sound emitted by a sound source into a first audio signal, a first matched filter configured for filtering the first audio signal into a first filtered audio signal, the first matched filter having a first matching transfer function that matches a first transfer function of a first sound propagation path of sound propagating from the sound source to the first microphone system providing the first audio signal, when a user wears the hearing aid, and a hearing loss processor configured to provide a hearing loss compensated output signal that compensates for a hearing loss of the user based at least in part on the first filtered audio signal.