Hearing device comprising a beamformer filtering unit

A hearing aid adapted for being located in an operational position at or in or behind an ear or fully or partially implanted in the head of a user, the hearing aid comprising

• first and second microphones for converting an input sound to first IN1 and second IN2 electric input signals, respectively,
• an adaptive beamformer filter for providing a resulting beamformed signal YBF, based on said first and second electric input signals, the adaptive beamformer filter comprising,
• a memory comprising
• a first set of complex frequency dependent weighting parameters Wo1(k), Wo2(k) representing a first beam pattern (O), where k is a frequency index, k=1, 2, . . . , K, and
• a second set of complex frequency dependent weighting parameters Wc1(k), Wc2(k) representing a second beam pattern (C),
• an adaptive beamformer processor for providing an adaptively determined adaptation parameter βopt(k) representing an adaptive beam pattern,
• said memory further comprising a fixed frequency dependent adaptation parameter βfix(k) representing a third, fixed beam pattern (OO),
• a mixer configured to provide a resulting complex, frequency dependent adaptation parameter βmix(k) as a combination of said fixed frequency dependent adaptation parameter βfix(k) and said adaptively determined frequency dependent adaptation parameter βopt(k),
• a resulting beamformer (Y) for providing said resulting beamformed signal YBF based on said first and second electric input signals IN1 and IN2, said first and second sets of complex frequency dependent weighting parameters Wo1(k), Wo2(k) and Wc1(k), Wc2(k), and said resulting complex, frequency dependent adaptation parameter βmix(k).