Hearing Aid Feedback Compensation Using Perceived Information Signals
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Solution Overview
Problem
Hearing aid devices face challenges in effectively measuring and reducing feedback without emitting test signals that are perceived by the user as interfering, leading to potential deterioration in speech intelligibility and unwanted whistling.
Innovation Solution
The use of information signals generated within the hearing aid device, which can be perceived by the user, as test signals to estimate the feedback path, allowing for the adjustment of adaptive filter parameters to suppress feedback without interfering with the user's experience, and ensuring these signals cover a wide frequency range for comprehensive feedback measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional test signals are used for feedback measurement, then feedback path can be measured, but user experiences interference and speech intelligibility deteriorates
Solution Approach 1:
The patent uses information signals that the user already perceives as useful (device status notifications, adjustment confirmations) as intermediaries to carry feedback measurement functionality. These signals serve dual purposes: informing the user about device state and enabling feedback path estimation, thereby avoiding additional interfering test signals while maintaining measurement capability.
Solution Approach 2:
The patent makes the information signals serve multiple functions: they act as both user communication signals (notifying about device adjustments, battery status, program changes) and as test signals for feedback path measurement. This multi-functionality eliminates the need for separate test signals that would interfere with user experience.
2Object-generated harmful factors
If feedback compensation is carried out continuously, then feedback can be reduced, but artifacts may occur and speech intelligibility may deteriorate
Solution Approach 1:
The patent implements feedback compensation at specific intervals using periodically emitted information signals rather than continuous compensation. The feedback path is measured at discrete time points when information signals are emitted, and compensation parameters are updated periodically, avoiding continuous processing that would generate artifacts while maintaining effective feedback control.
Solution Approach 2:
The patent dynamically adjusts the timing and frequency of feedback measurements based on when information signals are emitted to the user. The feedback compensation is adapted to the actual usage pattern, measuring and adjusting only when necessary (when information signals are being emitted), rather than applying static or continuous compensation that would degrade speech quality.
3Object-generated harmful factors
If adaptive filter parameters are adjusted frequently, then feedback suppression improves, but device complexity and processing load increase
Solution Approach 1:
The patent updates adaptive filter parameters periodically based on feedback measurements taken at discrete intervals when information signals are emitted, rather than continuously adjusting parameters. This periodic update approach maintains effective feedback suppression while significantly reducing processing complexity and computational load compared to continuous parameter adjustment.
Data Source
AI summary
With a hearing aid device, filter parameters of filters are to be adjusted for feedback suppression. It is hereby proposed that test signals are emitted via an earpiece in order to estimate the transmission behavior of the feedback path, and response signals to these test signals are recorded by a microphone and analyzed in the hearing aid device. In this way, information signals which are already occasionally emitted by the hearing aid device and can be perceived by the user are used as test signals. Information signals of this type are particularly well suited as test signals and are perceived by the user as non-interfering.