Hearing Instrument Gain Control for Binaural Monaural Switching
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Solution Overview
Problem
Hearing instruments with bilateral hearing loss users face non-ideal gain fittings when they occasionally use only one instrument, either by choice or due to unavailability, leading to suboptimal sound amplification and increased feedback risk.
Innovation Solution
A method for hearing instruments to determine the presence of a second instrument via communication link and adjust gain settings accordingly, switching between binaural and monaural gain settings to ensure optimal sound amplification, with the option to notify the user of battery failure or unavailability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed gain setting is used for binaural fitting, then optimal sound amplification is achieved when both hearing instruments are used, but suboptimal amplification and increased feedback risk occur when only one instrument is used
Solution Approach 1:
The gain setting is made dynamic by automatically adjusting it based on the operational status of the second hearing instrument. The system transitions from a static fixed gain to a dynamic adaptive gain that responds to real-time conditions, ensuring optimal performance whether one or both instruments are being used.
Solution Approach 2:
The gain parameter is changed based on the detection of the second instrument's status. When the second instrument is inactive, the system changes the gain parameter to a higher value suitable for monaural operation, thereby maintaining optimal amplification performance across different usage scenarios.
2Object-affected harmful factors
If reduced gain is applied for binaural fitting, then feedback risk is decreased, but sound amplification becomes suboptimal when only one hearing instrument is available
Solution Approach 1:
The gain setting dynamically adapts to the operational context. In binaural mode, lower gain reduces feedback risk; in monaural mode, higher gain compensates for the single instrument's limited amplification capacity. This dynamic adjustment resolves the contradiction between feedback reduction and amplification power.
Solution Approach 2:
The gain parameter is selectively changed based on usage mode detection. The system switches between different gain parameter values (lower for binaural, higher for monaural) to optimize both feedback management and sound amplification according to the actual operational conditions.
3Reliability
If the hearing instrument continuously monitors the second instrument's status, then optimal gain adjustment is achieved, but communication overhead and processing requirements increase
Solution Approach 1:
The system performs preliminary status detection of the second hearing instrument before finalizing the gain setting. This preliminary action allows the system to pre-determine the appropriate gain mode without requiring continuous complex communication, reducing overall processing burden while maintaining accurate gain adjustment.
Solution Approach 2:
The communication protocol is optimized by changing parameters such as the frequency and duration of status queries. The system adjusts the monitoring intensity based on operational needs, reducing communication overhead while maintaining sufficient information for accurate gain setting decisions.
Data Source
AI summary
According to the invention, in a hearing instrument it is once or repeatedly checked whether a second hearing instrument is present and active. If a second hearing instrument is active on the contralateral side, a first gain (corresponding to the gain for binaural fitting) is applied. If, however, no further hearing instrument is found to be active, a second—increased—gain is applied. The second gain may simply correspond to the first gain increased by a certain dB value. It may as an alternative be a specifically adapted gain characteristic of a monaural fitting for the user.