Patent ID: 8659976

Claim:
A method of reducing unwanted noise components detected by a sensor array, comprising: deriving signals from two groups of sensors within the sensor array, beam forming the first group of sensors to produce a first set of directional response beams, each directional response beam in the first set having a respective steer direction, beam forming the second group of sensors to produce a second set of directional response beams, each directional response beam in the second set having a same steer direction as a respective directional response beam in the first set, each one of the directional response beams having respective front and back lobes that extend on opposite sides of the array, and the front and back lobes of the directional response beams in the first set having a same phase as one another and the front and back lobes of the directional response beams in the second set having an opposite phase to one another, and combining pairs of directional response beams having the same steer directions, one beam from each group per steer direction, to form cardioid beams with nulls pointing in at least one beam-steering direction.