Patent ID: 7688990

Claim:
Hearing aid with an anti feedback system that operates in one of at least two adaptation modes, a fast adaptation mode and a slow adaptation mode, the hearing aid comprising: a directional processing block that: receives input signals from two or more microphones, generates a DIR-signal with directional sensitivity and an OMNI-directional signal, and provides, as an output signal, an addition of the DIR and OMNI signals, where the addition is performed by a fader that subjects both signals to gain factors before addition, and wherein the gain, α omni applied to the OMINI-signal has a value between 0 and 1, inclusive, and wherein the gain applied to the DIR-signal is (1-α− omni ), an acoustic environment detector that determines whether input signals from said microphones are directional or omni-directional, a trigger that generates an alert signal to the anti feed back system, said alert indicating the adaptation mode for the anti feedback system based on the value of α omni , and a controller that controls the trigger and the fader by generating a value for α omni based on input from the acoustic environment detector.