Patent Document ID: 20170295437
Application ID: 15482188
Patent Flag: 0

Claim One:
1. 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 (M 1 , M 2 ; M BTE1 , M BTE2 ) for converting an input sound to first IN 1 and second IN 2 electric input signals, respectively, an adaptive beamformer filtering unit (BFU) for providing a resulting beamformed signal Y BF , based on said first and second electric input signals, the adaptive beamformer filtering unit comprising, a first memory comprising a first set of complex frequency dependent weighting parameters W o1 (k), W o2 (k) representing a first beam pattern (O), where k is a frequency index, k=1, 2,. .. , K, a second memory comprising a second set of complex frequency dependent weighting parameters W c1 (k), W c2 (k) representing a second beam pattern (C), where said first and second sets of weighting parameters W o1 (k), W o2 (k) and W c1 (k), W c2 (k), respectively, are predetermined initial values or values updated during operation of the hearing aid, an adaptive beamformer processing unit for providing an adaptively determined adaptation parameter β opt (k) representing an adaptive beam pattern (OPT) configured to attenuate unwanted noise under the constraint that sound from a target direction is essentially unaltered, a third memory comprising a fixed adaptation parameter β fix (k) representing a third, fixed beam pattern (OO), a mixing unit configured to provide a resulting complex, frequency dependent adaptation parameter β mix (k) as a combination of said fixed frequency dependent adaptation parameter β fix (k) and said adaptively determined frequency dependent adaptation parameter β opt (k), a resulting beamformer (Y) for providing said resulting beamformed signal Y BF based on said first and second electric input signals IN 1 and IN 2 , said first and second sets of complex frequency dependent weighting parameters W o1 (k), W o2 (k) and W c1 (k), W c2 (k), and said resulting complex, frequency dependent adaptation parameter β mix (k).