Hearing Aid Transient Gain Control for Feedback
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Solution Overview
Problem
Hearing aid devices face limitations in amplifying specific frequency ranges due to feedback issues and mechanical stability, leading to inadequate perception of sounds like consonants, especially in high-frequency spectra, which impairs speech understanding.
Innovation Solution
A hearing aid device with a sound detector to briefly increase amplification beyond normal limits for recognized sounds, especially consonants, within specific frequency ranges, ensuring the amplification exceeds normal levels only for the duration of the sound and not long enough to cause feedback, thereby compensating for hearing loss without destabilizing the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If amplification is increased to compensate for hearing loss in high-frequency ranges, then speech intelligibility is improved, but feedback whistling occurs
Solution Approach 1:
The hearing aid implements dynamic gain control that adjusts amplification levels in real-time based on the detected sound signal characteristics. The system dynamically switches between normal gain mode and transient gain boost mode, allowing temporary amplification exceeding the stable maximum gain only during brief consonant sounds, thereby resolving the contradiction between achieving sufficient amplification for speech intelligibility and avoiding feedback whistling
Solution Approach 2:
The system employs periodic detection of transient sounds (consonants) and applies amplified gain only during these brief periods. By detecting the presence of consonant signals and temporarily increasing gain for their duration, then returning to normal gain levels, the system achieves periodic action that improves speech intelligibility during critical moments while avoiding continuous feedback conditions
2Ease of operation
If device size is reduced for wearability, then ease of operation is improved, but maximum achievable amplification is limited
Solution Approach 1:
The system applies partial action by providing excessive amplification only when and where needed - specifically during brief transient consonant sounds in frequency ranges where the hearing aid has adequate headroom. Rather than maintaining high amplification continuously (which would cause feedback), the system delivers temporary amplification bursts that exceed the stable maximum gain, achieving the necessary speech intelligibility enhancement without requiring a larger device
Data Source
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AI summary
The invention relates to a hearing aid (11) comprising: - an input converter (12) for receiving an input signal and converting it into an electrical input signal (ES); - a signal processing unit (14, 15, 16) for processing and frequency-dependent amplification (V, V1, ..., V8) of the electrical input signal and generating an electrical output signal (AS); - an output converter (18) for converting the electrical output signal into an acoustic output signal; - a sound detector device (19) for detecting sounds in a speech signal entering the hearing aid; - means (20) for briefly increasing (V6') the amplification (V6) beyond normal amplification (VN) for a frequency range (K6) in which a detected sound has signal components; - means for adjusting the normal amplification of an electrical input signal as a function of the signal frequency (f); wherein - the amplification is at least in a specific frequency range (K1, ..., K8) is limited to a permanently possible maximum amplification (VMax); - the amplification exceeds the normal amplification or the maximum amplification at least for the duration of the detected sound and at most for a duration that is less than the settling time of a feedback whistle.