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公开(公告)号：US09930448B1
公开(公告)日：2018-03-27
申请号：US15347482
申请日：2016-11-09
Applicant: Northwestern Polytechnical University
Inventor： Jingdong Chen , Gongping Huang , Jacob Benesty
CPC classification number: H04R3/005 , H04R1/406 , H04R2201/401 , H04R2430/21
Abstract: A differential microphone array includes a plurality of microphones situated on a substantially planar platform, the plurality of microphones including a total number (M) of microphones and at least two subsets of the plurality of microphones situated along at least two substantially concentric ellipses with respect to a center, and a processing device, communicatively coupled to the plurality of microphones, to receive a plurality of electronic signals generated by the plurality of microphones responsive to a sound source and execute a minimum-norm beamformer to calculate an estimate of the sound source based on the plurality of electronic signals, in which the minimum-norm beamformer has a differential order (N), and wherein M>N+1.
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公开(公告)号：US09749745B2
公开(公告)日：2017-08-29
申请号：US14980802
申请日：2015-12-28
Applicant: Northwestern Polytechnical University
Inventor： Jingdong Chen , Jacob Benesty
CPC classification number: H04R3/04 , H04R1/08 , H04R1/406 , H04R3/005 , H04R2201/403 , H04R2430/03 , H04R2430/21
Abstract: A differential microphone array includes a number (M) of microphone sensors for converting sound to a number of electrical signals, and a processor, operably coupled to the microphone sensors, to specify a target differential order (N) for the differential microphone array, and wherein M>N+1, specify a steering matrix D comprising N+1 steering vectors, calculate a respective one of a plurality of linearly specify a steering matrix D comprising N+1 steering vectors-constrained minimum variance filters based on the steering matrix, apply the respective one of the plurality of linearly-constrained minimum variance filters to a respective one of the electrical signals to calculate a respective frequency response of the electrical signals, wherein the respective frequency response comprises a plurality of components associated with a plurality of subbands, and sum the frequency responses of the electrical signals with respect to each subband to calculate an estimated frequency spectrum of the sound.
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公开(公告)号：US09560463B2
公开(公告)日：2017-01-31
申请号：US14792783
申请日：2015-07-07
Applicant: Northwestern Polytechnical University
Inventor： Jingdong Chen , Chao Pan , Jacob Benesty
CPC classification number: H04R29/005 , G10L21/0216 , G10L2021/02166 , H04R1/40 , H04R1/406 , H04R3/005 , H04R2201/40 , H04R2201/403 , H04R2410/01 , H04R2430/20 , H04R2430/23
Abstract: A system and method relate to receiving, by a processing device, a plurality of sound signals captured at a plurality of microphone sensors, wherein the plurality of sound signals are from a sound source, and wherein a number (M) of the plurality of microphone sensors is greater than three, determining a number (K) of layers for a multistage minimum variance distortionless response (MVDR) beamformer based on the number (M) of the plurality of microphone sensors, wherein the number (K) of layers is greater than one, and wherein each layer of the multistage MVDR beamformer comprises one or more mini-length MVDR beamformers, and executing the multistage MVDR beamformer to the plurality of sound signals to calculate an estimate of the sound source.
Abstract translation: 一种系统和方法涉及通过处理装置接收在多个麦克风传感器处捕获的多个声音信号，其中所述多个声音信号来自声源，并且其中所述多个麦克风的数量（M） 传感器大于3，基于多个麦克风传感器的数量（M）确定用于多级最小方差失真响应（MVDR）波束形成器的层数（K），其中层数（K）大于 一个，并且其中多级MVDR波束形成器的每层包括一个或多个微型长度MVDR波束形成器，并且对多个声音信号执行多级MVDR波束形成器以计算声源的估计。
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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.
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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.
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Patent Agency Ranking
6.发明授权公开(公告)号：US11159879B2
公开(公告)日：2021-10-26
申请号：US16771549
申请日：2018-07-16
Applicant: Northwestern Polytechnical University
Inventor： Jingdong Chen , Gongping Huang , Jacob Benesty
Abstract: A differential microphone array includes a plurality of microphones situated on a substantially planar platform and a processing device, communicatively coupled to the plurality of microphones, to receive a plurality of electronic signals generated by the plurality of microphones responsive to a sound source and execute a minimum-norm beamformer to calculate an estimate of the sound source based on the plurality of electronic signals, wherein the minimum-norm beamformer is determined subject to a constraint that an approximation of a beampattern associated with the differential microphone array substantially matches a target beampattern.
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公开(公告)号：US10951981B1
公开(公告)日：2021-03-16
申请号：US16717644
申请日：2019-12-17
Applicant: Northwestern Polytechnical University
Inventor： Jingdong Chen , Jilu Jin , Gongping Huang
Abstract: An Nth order linear differential microphone array (LDMA) including at most M microphones, where M is greater than N, is constructed by identifying a number K of combinations of at least (N+1) of the M microphones. A target cost function is specified based on at least one of a directivity factor, a beampattern, or a white noise gain associated with the LDMA. For each frequency band of a plurality of frequency bands: an optimal combination of microphones, from the K combinations, is determined based on an evaluation of the target cost function for the band and beamforming is performed using the determined optimal combination for the band. A union of the optimal combinations of microphones for the plurality of bands may be determined and the LDMA may be constructed, using microphones in the union, based on an evaluation of the target cost function across the plurality of bands.
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公开(公告)号：US11956590B2
公开(公告)日：2024-04-09
申请号：US17413111
申请日：2019-03-19
Applicant: Northwestern Polytechnical University
Inventor： Jingdong Chen , Gongping Huang
Abstract: A beamformer, for a differential microphone array (DMA) including a number M of microphones, is constructed based on a specified target directivity factor (DF) value for the DMA. An N order beampattern is generated for the DMA, wherein N is an integer and a first DF value corresponding to the N order beampattern is greater than the target DF value. An N−1 order beampattern is generated for the DMA, wherein a second DF value corresponding to the N−1 order beampattern is greater than the target DF value. A fractional order beampattern is generated for the DMA, wherein a third DF value corresponding to the fractional order beampattern matches the target DF value and the fractional order beampattern comprises a first fractional contribution from the N order beampattern and a second fractional contribution from the N−1 order beampattern.
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公开(公告)号：US11546691B2
公开(公告)日：2023-01-03
申请号：US17273237
申请日：2020-06-04
Applicant: Northwestern Polytechnical University
Inventor： Jingdong Chen , Yuzhu Wang , Jilu Jin , Gongping Huang , Jacob Benesty
IPC: H04R3/00 , G10K11/178 , G10L21/0208 , H04R5/027 , G10L21/0216
Abstract: A binaural beamformer comprising two beamforming filters may be communicatively coupled to a microphone array to generates two beamforming outputs, one for the left ear and the other for the right ear. The beamforming filters may be configured in such a way that they are orthogonal to each other to make white noise components in the binaural outputs substantially uncorrelated and desired signal components in the binaural outputs highly correlated. As a result, the human auditory system may better separate the desired signal from white noise and intelligibility of the desired signal may be improved.
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10.发明申请公开(公告)号：US20190069086A1
公开(公告)日：2019-02-28
申请号：US16117186
申请日：2018-08-30
Applicant: Northwestern Polytechnical University
Inventor： Jingdong Chen , Gongping Huang
Abstract: A multi-ringed differential microphone array includes a first number of microphones situated along a first substantial circle having a first radius, a second number of microphones situated along a second substantial circle having a second radius, and a processing device, communicatively coupled to the first number microphones and the second number of microphones, to receive a plurality of electronic signals generated by the first number of microphones and the second number of microphones, determine a differential order (N) based on the second number, and execute an N-th order minimum-norm beamformer to calculate an estimate of the sound source based on the plurality of electronic signals.
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