公开(公告)号：US12212923B2

公开(公告)日：2025-01-28

申请号：US17926608

申请日：2021-02-10

Applicant: Northwestern Polytechnical University

Inventor： Xin Leng ,  Jingdong Chen

IPC: H04R1/40 ,  G10L21/0208 ,  G10L21/0216 ,  H04R3/00 ,  H04R5/027

Abstract: A first-order differential microphone array (FODMA) with a steerable beamformer is constructed by specifying a target beampattern for the FODMA at a steering angle θ and then decomposing the target beampattern into a first sub-beampattern and a second sub-beampattern based on the steering angle θ. A first sub-beamformer and a second sub-beamformer are generated to each filter signals from microphones of the FODMA, wherein the first sub-beamformer is associated with the first sub-beampattern, and the second sub-beamformer is associated with the second sub-beampattern. The steerable beamformer is then generated based on the first sub-beamformer and the second sub-beamformer. The decomposing of the target beampattern into a first sub-beampattern and a second sub-beampattern includes dividing the target beampattern into a sum of a first-order cosine (cardioid) first sub-beampattern and a first-order sinusoidal (dipole) second sub-beampattern.