Binaural Hearing System Preserving Interaural Level Difference
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Solution Overview
Problem
Binaural hearing systems fail to preserve interaural level differences (ILD) cues, leading to difficulties in sound source localization and segregation, especially in noisy environments, due to processing-intensive and error-prone detection and reproduction of spatial cues.
Innovation Solution
A binaural hearing system with synchronized gain processing between sound processors at each ear, using beamforming operations and gain processing to enhance and preserve ILD cues, ensuring identical gain processing parameters for both ears to maintain the integrity of ILD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If independent gain processing is performed at each ear, then signal processing flexibility is improved, but spatial cue preservation deteriorates
Solution Approach 1:
The audio signal is divided into multiple frequency bands, with different processing strategies applied to each band. High-frequency signals undergo independent gain processing at each ear for flexibility, while low-frequency signals undergo joint gain processing to preserve spatial cues, resolving the contradiction between processing flexibility and spatial cue preservation.
Solution Approach 2:
Different processing qualities are applied to different parts of the signal spectrum. The system applies strict spatial cue preservation to low-frequency components where ILD cues are critical, while allowing more processing flexibility for high-frequency components, thus optimizing both spatial accuracy and processing adaptability.
2Measurement precision
If ILD detection and reproduction are implemented, then sound source localization accuracy is improved, but processing complexity increases
Solution Approach 1:
The system applies ILD preservation processing selectively only to low-frequency signal components rather than the entire spectrum. This partial action approach maintains localization accuracy where it matters most while significantly reducing the overall processing complexity and computational burden.
Solution Approach 2:
The system changes the processing parameters based on frequency content, applying different gain processing modes (joint vs. independent) to different frequency bands. This parameter adaptation allows accurate ILD reproduction without requiring complex processing across all frequencies.
3Object-affected harmful factors
If noise cancelation and wind cancelation are performed, then signal quality is improved, but ILD cue integrity deteriorates
Solution Approach 1:
Noise and wind cancelation operations are segmented and applied selectively to different frequency bands and signal components. By processing only specific portions of the signal through these operations, the system removes harmful factors while preserving the integrity of ILD cues in the remaining signal portions.
Solution Approach 2:
Different levels of noise/wind cancelation processing are applied to different parts of the signal. The system applies aggressive cancelation where it improves quality without harming ILD cues, while applying minimal or no cancelation where ILD integrity is critical, thus optimizing both signal quality and cue preservation.
Data Source
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AI summary
A binaural hearing system (system) enhances and/or preserves interaural level differences between first and second signals. The system includes first and second audio detectors associated with first and second ears of a user, respectively. The audio detectors detect an audio signal presented to the user and generate the first and second signals to represent the audio signal as detected at the first and second ears, respectively. The system also includes a first sound processor that receives the first signal from the first audio detector and the second signal from a second sound processor via a communication link. The first sound processor compares the first and second signals to generate a gain processing parameter, and performs a gain processing operation on a signal based on the gain processing parameter prior to presenting a gain-processed output signal representative of the first signal to the user at the first ear of the user.