ONLINE ANTI-FEEDBACK SYSTEM FOR A HEARING AID

A hearing aid system comprises an input transducer, a forward path, an output transducer and an electrical feedback path, the forward path comprising a signal processing unit for modifying an electrical input signal to a specific hearing profile over a predefined frequency range, wherein the predefined frequency range comprises a number of frequency bands, for which maximum forward gain values IG max for each band are stored in a memory. The electrical feedback path comprises an adaptive filter for estimating acoustical feedback from the output to the input transducer. The hearing aid system further comprises an online feedback manager unit for - with a predefined update frequency - identifying current feedback gain in each frequency band of the feedback path, and for subsequently adapting the maximum forward gain values IG max in each of the frequency bands in dependence thereof in accordance with a predefined scheme, and wherein the update frequency is adapted to a relevant hearing situation. The invention may e.g. be used in digital hearing aids for use in a variety of acoustical environments.