Real-time feedback cancellation in hearing aids
Keywords:Closed loop control systems, Computational methods, Costs, Detectors, Feedback, Nyquist diagrams, Patient monitoring, Signal processing, Digital systems, Feedback canceler, Feedback detection technologies, Frequency bands, Signal quality
AbstractThe real-time adaptive feedback canceller in a digital hearing aid during telephone use is studied. Detection of feedback onset involves five criteria such as continous and limited input signal level variation, continous modulation of input signal level, duration of specific input signal, and difference between the current gain to the maximum deliverable gain. It is observed that when feedback is detected, the adaptive feedback canceller modifies the system gain around the knee-point. It is suggested to detect the onset of the feedback build-up pattern to prevent any audible feedback reaching the hearing aid user's ear.
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