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公开(公告)号：US20230071304A1
公开(公告)日：2023-03-09
申请号：US17800145
申请日：2020-03-10
Applicant: NEC Corporation
Inventor： Yumi ARAI , Reishi KONDO
Abstract: In order to estimate the trajectory of a moving wave source, this trajectory estimation device (10) comprises: an acquisition unit (11) that acquires wave motion data based on wave motion detected by a plurality of sensors (100); a generation unit (12) that generates a spectrogram using the wave motion data; an extraction unit (13) that extracts a Doppler shift from the spectrogram; a selection unit (14) that selects, as a sensor pair, two sensors that satisfy a preset selection condition pertaining to the Doppler shift; and an estimation unit (15) that estimates the trajectory of a wave source, which is the source generating the wave motion, on the basis of the positional relationship between the sensors constituting the sensor pair and the relationship of the Doppler shift between the two sensors constituting the sensor pair.
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2.发明公开公开(公告)号：US20240003660A1
公开(公告)日：2024-01-04
申请号：US18034608
申请日：2020-11-16
Applicant: NEC Corporation
Inventor： Yumi ARAI
IPC: F41G7/34
CPC classification number: F41G7/343
Abstract: A trajectory estimation device that includes a waveform generation unit that generates, by using signals based on waves detected by at least three sensors, peak waveforms consisting of time series data of peak frequencies of the signals, a parameter estimation unit that estimates, from the peak waveforms relating to the waves detected by the at least three sensors, a trajectory parameter relating to a trajectory of a moving body having a wave source of the waves, and a trajectory estimation unit that estimates, for all combinations of two of the peak waveforms selected from among combinations of at least three of the peak waveforms, a wave source direction candidate for each of the waves by using the trajectory parameter, and estimate, as a trajectory of the moving body, overlapping trajectory candidates from among trajectory candidates estimated based on the wave source direction candidates.
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公开(公告)号：US20210263126A1
公开(公告)日：2021-08-26
申请号：US17252405
申请日：2018-06-25
Applicant: NEC Corporation
Inventor： Yumi ARAI , Reishi KONDO , Yuzo SENDA
Abstract: A wave-source-direction estimation device includes: a plurality of input units that acquires, as input signals, electrical signals based on waves detected by a plurality of sensors; a signal selection unit that selects a plurality of pairs that are each a combination of two input signals from among a plurality of the input signals; a relative delay time calculation unit that calculates, as relative delay times, arrival time differences of the waves at the sensors that are supply sources of the two input signals composing each of the pairs, for each wave source direction; and an integrated-estimated-direction-information calculation unit that generates per-frequency estimated direction information for each of the pairs using the input signals composing each of the pairs and the relative delay times of each of the pairs and generates integrated estimated direction information by assigning a weight to and integrating the estimated direction information on all the pairs.
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Patent Agency Ranking
4.发明申请公开(公告)号：US20250067593A1
公开(公告)日：2025-02-27
申请号：US18801970
申请日：2024-08-13
Applicant: NEC Corporation
Inventor： Noriyuki TONAMI , Sakiko MISHIMA , Yumi ARAI , Reishi KONDO , Tomoyuki HINO
Abstract: A noise suppression apparatus according to the present disclosure includes at least one memory configured to store instructions, and at least one processor configured, by executing the instructions, to input a plurality of noise superimposed signals that are acquired by distributed acoustic sensing (DAS) using an optical fiber cable and on which noise is superimposed, extract a common feature of the plurality of input noise superimposed signals as a noise suppression signal in which noise is suppressed, and output the extracted noise suppression signal.
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公开(公告)号：US20220342026A1
公开(公告)日：2022-10-27
申请号：US17637146
申请日：2019-09-02
Applicant: NEC Corporation
Inventor： Yumi ARAI , Reishi KONDO
Abstract: A wave source direction estimation device includes a signal extraction unit that sequentially extracts, one at a time, signals of signal segments according to a set time length from at least two input signals based on a wave detected at different detection positions, a function generation unit that generates a function associating at least two signals extracted by the signal extraction unit, a sharpness calculation unit that calculates sharpness of a peak of the function generated by the function generation unit, and a time length calculation unit that calculates the time length based on the sharpness and set the calculated time length.
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6.发明公开公开(公告)号：US20240361417A1
公开(公告)日：2024-10-31
申请号：US18571804
申请日：2021-06-23
Applicant: NEC cORPORATION
Inventor： Yumi ARAI
IPC: G01S3/801
CPC classification number: G01S3/801
Abstract: A wave motion signal processing device that includes a spectrum generation unit that generates a first spectrum with high resolution and a second spectrum with low resolution based on an input signal derived from a wave motion detected by at least one sensor, an extraction unit that extracts, from the second spectrum, a first peak satisfying an extraction condition in a target time window, a tracking unit that tracks, in the first spectrum, a second peak satisfying the extraction condition with regard to a time frame following the target time frame from which the first peak is extracted, and a waveform generation unit that generates a peak waveform, which is time-series data of a frequency including a plurality of second peaks, having the first peak as a starting end.
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公开(公告)号：US20210263125A1
公开(公告)日：2021-08-26
申请号：US17252391
申请日：2018-06-25
Applicant: NEC Corporation
Inventor： Yumi ARAI , Yuzo SENDA , Reishi KONDO
Abstract: A wave-source-direction estimation device includes: input units that acquire, as input signals, electrical signals that have been converted from waves acquired by sensors; a signal selection unit that selects at least two pairs that are each a combination of at least two input signals from among the input signals; a relative delay time calculation unit that calculates, as relative delay times, arrival time differences of the waves for each wave source searching direction between the at least two input signals composing one of the pairs of the input signals; at least one per-frequency estimated-direction-information generation unit that uses the pairs of the input signals and the relative delay times to generate estimated direction information on a wave source of the waves for each frequency; and an integration unit that integrates the estimated direction information generated for each frequency by the per-frequency estimated-direction-information generation unit.
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8.发明申请公开(公告)号：US20160171965A1
公开(公告)日：2016-06-16
申请号：US14967724
申请日：2015-12-14
Applicant: NEC Corporation
Inventor： Yumi ARAI , Yuzo SENDA , Osamu HOSHUYAMA
IPC: G10K11/178 , H04R29/00
CPC classification number: H04R29/00 , G01S5/22 , H04R2430/23
Abstract: A vibration source estimation device, method and computer-readable medium are provided. The vibration source estimation device comprises a processor configured to execute instructions to receive data samples of a plurality of vibration signals generated at a vibration position, the data samples being associated with a plurality of frames. The processor is also configured to execute instructions to calculate a cross correlation function for each frame based on the data samples, calculate a weight for each frame based on a signal-to-noise ratio calculated from the cross correlation function, multiply the cross correlation function for each frame by the weight, calculate a sum of weighted cross correlation functions for respective frames as a weighted-cross-correlation function, and estimate the vibration position based on the weighted-cross-correlation function.
Abstract translation: 提供振动源估计装置，方法和计算机可读介质。 振动源估计装置包括处理器，其被配置为执行指令以接收在振动位置产生的多个振动信号的数据样本，所述数据样本与多个帧相关联。 处理器还被配置为执行指令以基于数据样本计算每个帧的互相关函数，基于从互相关函数计算的信噪比来计算每个帧的权重，将互相关函数 对于每个帧，通过权重，计算各个帧的加权互相关函数的和作为加权互相关函数，并且基于加权互相关函数估计振动位置。
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