Patent ID: 8594355

Claim:
A hearing device for compensating hearing impairment of a user, comprising: an input signal converter configured to convert an acoustic signal to an electric signal; an output signal converter configured to convert a processed signal to a processed acoustic signal presented to the user; an adaptive feedback suppression unit configured to compensate for acoustic feedback between said output signal converter and said input signal converter, said acoustic feedback being defined by an acoustic feedback transfer function, and to generate a feedback compensation signal defining an electric feedback transfer function representing an estimate of said acoustic feedback transfer function, the feedback compensation signal being mixed with said electric signal generating a compensated electric signal; a signal processor configured to process said compensated electric signal and to generate said processed signal therefrom; and an open loop approximation unit configured to monitor a relation between said compensated electric signal and said processed signal to provide an estimate of the difference between the acoustic feedback transfer function and the electric feedback transfer function provided by the adaptive feedback suppression unit, and configured to generate a control signal based on said relation between said compensated electric signal and said processed signal, said control signal controlling said signal processor and/or said adaptive feedback suppression unit, wherein the signal processor is further configured to determine a residual acoustic feedback and/or the open loop gain based on said control signal.