Bilateral Hearing Aid AGC Synchronization for Binaural Cue Preservation
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Solution Overview
Problem
Bilateral hearing prosthesis systems face challenges in preserving binaural cues, such as Interaural Level Differences (ILDs), due to distortion caused by independent operation of Automatic Gain Control (AGC) systems in each ear, leading to impaired sound localization and speech understanding.
Innovation Solution
Implementing a power-efficient communication method between bilateral prostheses to dynamically adjust the AGC update rate based on operational timing parameters, minimizing power consumption while maintaining effective AGC communication, and using linked AGC systems to preserve ILD cues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If independent AGC systems operate in each ear, then power consumption is reduced and device simplicity is maintained, but binaural cues such as ILDs are distorted
Solution Approach 1:
The patent merges the AGC operations of two independent hearing prostheses by establishing a master-slave relationship where the slave prosthesis synchronizes its AGC updates with the master prosthesis. This combining approach preserves binaural cues like ILDs while maintaining power efficiency, as the slave prosthesis can operate with reduced processing independent of continuous bilateral communication.
Solution Approach 2:
The system dynamically adjusts the AGC update rate based on operational conditions and synchronizes timing between bilateral prostheses. By making the AGC operation dynamic and adaptive rather than static and independent, the system preserves binaural information while optimizing power consumption according to real-time needs.
2Measurement precision
If AGC update rate is increased to preserve binaural cues, then ILD accuracy improves, but power drain increases
Solution Approach 1:
The patent implements periodic AGC updates synchronized between bilateral prostheses rather than continuous updates. The master prosthesis generates periodic AGC updates at optimized intervals, and the slave prosthesis synchronizes to these periodic updates. This periodic action maintains ILD accuracy while significantly reducing power consumption compared to continuous high-rate updates.
Solution Approach 2:
The system changes the AGC update rate parameter dynamically based on operational conditions. By adjusting this parameter rather than maintaining a fixed high update rate, the system achieves sufficient ILD accuracy while optimizing power consumption. The parameter change allows adaptation between quality and power efficiency based on real-time needs.
3Device complexity
If bilateral AGC systems operate independently, then device complexity is minimized, but sound localization and speech understanding are impaired
Solution Approach 1:
The patent introduces a master-slave coordination mechanism as an intermediary between two independent AGC systems. The master prosthesis acts as the coordinator that generates synchronized AGC updates, which the slave prosthesis follows. This intermediary approach preserves binaural cues for accurate sound localization while maintaining relatively simple device architecture, avoiding the need for complex continuous bilateral communication protocols.
Data Source
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AI summary
Presented herein are techniques for preservation/retention of binaural cues in a bilateral system, such as a bilateral hearing/auditory prosthesis system. The bilateral system comprises first and second bilateral prostheses, each of which includes an automatic gain control (AGC) system. The first and second bilateral prostheses communicate with one another over a AGC update channel/link to exchange AGC updates in a power-efficient manner.