公开(公告)号：US20230209252A1

公开(公告)日：2023-06-29

申请号：US17926608

申请日：2021-02-10

Applicant: Northwestern Polytechnical University

Inventor： Xin LENG ,  Jingdong CHEN

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

CPC classification number: H04R1/406 ,  G10L21/0208 ,  H04R3/005 ,  H04R5/027 ,  G10L2021/02166 ,  H04R2201/401

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.

公开(公告)号：US20250150758A1

公开(公告)日：2025-05-08

申请号：US19015496

申请日：2025-01-09

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) system with a steerable beamformer. The system includes a plurality (M) of microphones located on a substantially planar platform, the plurality of microphones comprising a first subset (M_1) of microphones and a second subset (M_2) of microphones, and a processing device, communicatively coupled to the plurality of microphones, configured to construct a first sub-beamformer based on the first sub-set (M_1) of microphones and a target beampattern at a steering angle θ, wherein the first sub-beamformer is characterized according to a first-order cosine (cardioid) first sub-beampattern, construct a second sub-beamformer based on the second sub-set (M_2) of the microphones and the target beampattern at the steering angle θ, wherein the second sub-beamformer is characterized according to a first-order sinusoidal (dipole) second sub-beampattern, and generate the steerable beamformer based on the first sub-beamformer and the second sub-beamformer.