Hearing device and a hearing system comprising a multitude of adaptive two channel beamformers

A method of operating a hearing aid, where the hearing aid comprising:

• at least two input transducers used to convert sound in an environment of the hearing aid to respective first and second electric input signals,
• the method comprising
• providing
• a primary adaptive 2-channel beamformer,
• a secondary adaptive 2-channel beamformer, and
• that each of the primary and secondary adaptive 2-channel beamformers providing an output signal for reducing noise in connection with a target direction based on first and second beamformer-input signals, and
• that said primary and secondary adaptive 2-channel beamformers are coupled in a cascaded structure configured to provide that:
• said first and second beamformer-input signals of the primary adaptive 2-channel beamformer are the first and second electric input signals,
• one of the first and second beamformer-input signals of the secondary adaptive 2-channel beamformer is the output signal of the primary 2-channel beamformer, and
• the other of the first and second beamformer-input signals of the secondary adaptive 2-channel beamformer is an external audio input signal received via transceiver circuitry or an input signal from a third input transducer in the hearing aid,
• wherein the output signal of the secondary adaptive 2-channel beamformer provides an estimate of a target signal.