公开(公告)号：US20220295175A1

公开(公告)日：2022-09-15

申请号：US17191253

申请日：2021-03-03

Applicant: Northwestern Polytechnical University

Inventor： Jingdong CHEN ,  Jilu Jin ,  Gongping Huang ,  Xuehan Wang

IPC: H04R1/40 ,  H04R3/00 ,  G10L21/0216

Abstract: An Nth order linear differential microphone array (LDMA) with a steerable beamformer may be constructed by specifying a target beampattern for the LDMA at a steering angle θ. An Nth order polynomial associated with the target beampattern may then be generated. A relationship between the nulls of the polynomial and the steering angle θ is determined and then a value of one of the nulls is determined based on N−1 assigned values for the other nulls and the determined relationship between the nulls of the polynomial and the steering angle θ. The steerable beamformer may be generated based on the determined null value and the N−1 assigned null values. The N−1 assigned null values may be associated with the N−1 nulls of the polynomial that are of less than Nth order and the determined null value may be associated with the null of the polynomial that is of Nth order.

公开(公告)号：US11509998B2

公开(公告)日：2022-11-22

申请号：US17191253

申请日：2021-03-03

Applicant: Northwestern Polytechnical University

Inventor： Jingdong Chen ,  Jilu Jin ,  Gongping Huang ,  Xuehan Wang

IPC: H04R1/40 ,  H04R3/00 ,  G10L21/0216

Abstract: An Nth order linear differential microphone array (LDMA) with a steerable beamformer may be constructed by specifying a target beampattern for the LDMA at a steering angle θ. An Nth order polynomial associated with the target beampattern may then be generated. A relationship between the nulls of the polynomial and the steering angle θ is determined and then a value of one of the nulls is determined based on N−1 assigned values for the other nulls and the determined relationship between the nulls of the polynomial and the steering angle θ. The steerable beamformer may be generated based on the determined null value and the N−1 assigned null values. The N−1 assigned null values may be associated with the N−1 nulls of the polynomial that are of less than Nth order and the determined null value may be associated with the null of the polynomial that is of Nth order.