Binaurally Coordinated Compression for Hearing Aids
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Solution Overview
Problem
Hearing-impaired individuals face difficulties understanding speech in complex acoustic scenes due to the reduction of inter-aural level differences (ILDs) by dynamic range compression in hearing assistance devices, which diminishes spatial cues in multitalker environments.
Innovation Solution
A binaurally coordinated dynamic range compression system that independently or coordinately adjusts audio gains in hearing aids based on the detected acoustic scene, preserving ILDs and optimizing audibility and comfort in various sound source scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dynamic range compression is applied to amplify softer sounds and reduce louder sounds, then audibility and comfortable loudness are improved, but inter-aural level differences (ILDs) are reduced and spatial cues are lost
Solution Approach 1:
The system dynamically switches between independent and coordinated compression modes based on real-time acoustic scene analysis. When a single sound source is detected, independent compression is applied to optimize audibility. When multiple sound sources are detected, coordinated compression is applied to preserve spatial cues and ILDs for better-ear listening.
Solution Approach 2:
The compression system changes its operating parameters (gain distribution, compression ratio) based on the detected acoustic scene. The control circuitry adjusts compression parameters independently or coordinates them between ears depending on whether one or multiple sound sources are present, thereby adapting the balance between audibility and spatial cue preservation.
2Reliability
If independent dynamic range compression is performed at each ear, then audibility of softer sounds is improved, but spatial hearing cues are degraded
Solution Approach 1:
The system dynamically adapts the compression strategy based on acoustic scene analysis. In single-source scenarios, independent compression maximizes audibility. In multi-source scenarios, coordinated compression preserves spatial hearing by maintaining consistent ILDs across both ears.
Solution Approach 2:
The control circuitry continuously monitors the acoustic scene and provides feedback to adjust compression parameters. This feedback mechanism enables the system to switch between compression modes based on real-time detection of sound source number and distribution, thereby preventing spatial hearing degradation when needed.
3Loss of information
If coordinated dynamic range compression is applied to preserve spatial cues, then spatial hearing is improved, but audibility of softer sounds may be reduced
Solution Approach 1:
The system dynamically selects the appropriate compression mode based on acoustic scene detection. When multiple sound sources are detected with specific spatial distribution, coordinated compression is applied to preserve spatial cues. When a single sound source is detected, independent compression is applied to maximize audibility.
Solution Approach 2:
The compression parameters are changed based on the detected acoustic scene. The control circuitry adjusts gain distribution and compression characteristics to balance spatial cue preservation with audibility, switching between coordinated and independent modes as needed.
Data Source
AI summary
A hearing assistance system includes a pair of hearing aids performing dynamic range compression while preserving spatial cue to provide a hearing aid wearer with satisfactory listening experience in complex listening environments. In various embodiments, the dynamic range compression is binaurally coordinated based on number and distribution of sound source(s). In various embodiments, in addition to preserving spatial cue, the dynamic range compression is controlled to optimize audibility and comfortable loudness of target signals.