公开(公告)号：US20230296409A1

公开(公告)日：2023-09-21

申请号：US18021245

申请日：2020-09-29

Applicant: NEC Corporation

Inventor： Sakiko MISHIMA ,  Reishi KONDO

IPC: G01D1/18

CPC classification number: G01D1/18

Abstract: A signal processing device according to an aspect of the present disclosure comprises: cutout means that cuts out a target signal in a predetermined section, and an overlap signal in a section not matching the predetermined section but overlapping with at least part of the predetermined section from an input signal; conversion means that converts the target signal and the overlap signal into a phase component signal in a frequency domain with respect to each frequency; gradient calculation means that, based on the phase component signal, calculates, at each frequency, a phase gradient that is the gradient of the phase component at the frequency; score calculation means that calculates a score relating to the sudden change characteristic of the input signal according to the phase gradients; and determination means that, based on the score, determines the presence or absence of a sudden change in the target signal.

公开(公告)号：US20240426649A1

公开(公告)日：2024-12-26

申请号：US18741955

申请日：2024-06-13

Applicant: NEC Corporation

Inventor： Noriyuki TONAMI ,  Wataru KOHNO ,  Sakiko MISHIMA ,  Takashi MATSUSHITA ,  Tomoyuki HINO

IPC: G01H9/00 ,  G01D5/353

Abstract: An information processing device includes an acquisition unit that acquires measurement signals measured at a plurality of measurement points on a laid optical fiber cable, a prediction unit that predicts a predictive environment representing the environment of each of the measurement points from each of the measurement signals by using a prediction model set in advance, and a correction unit that corrects the predictive environment on the basis of a comparison between the predictive environment of each of the measurement points and the measurement signal measured at each of the measurement points.

公开(公告)号：US20240201049A1

公开(公告)日：2024-06-20

申请号：US18288104

申请日：2021-05-07

Applicant: NEC Corporation

Inventor： Sakiko MISHIMA ,  Yuko OHTA ,  Reishi KONDO

IPC: G01M99/00

CPC classification number: G01M99/005

Abstract: A signal processing device according to an aspect of the present disclosure includes: at least one memory configured to store instructions; and at least one processor configured to execute the instructions to: convert an input signal into a predetermined signal in a time-frequency domain; estimate a peak of a time-frequency intensity of the predetermined signal as an intensity of a target signal; estimate a band including at least a bandwidth from a frequency related to a peak to a predetermined frequency and does not include a frequency related to a peak different from the peak, as a noise band that is a frequency band of a noise signal; estimate an intensity of the noise signal based on a time-frequency intensity in the noise band; and determine whether an event has occurred based on a ratio between the intensity of the target signal to the intensity of the noise signal.

公开(公告)号：US20240184014A1

公开(公告)日：2024-06-06

申请号：US18526798

申请日：2023-12-01

Applicant: NEC Corporation

Inventor： Sakiko MISHIMA ,  Takashi MATSUSHITA ,  Wataru KOHNO ,  Tomoyuki HINO

IPC: G01W1/14 ,  G01D5/353 ,  G01H9/00

CPC classification number: G01W1/14 ,  G01D5/35358 ,  G01H9/004

Abstract: An optical fiber sensing system according to the present disclosure includes an optical fiber, an interrogator connected to the optical fiber, and a vibration device disposed in a vicinity of the optical fiber. The vibration device acquires weather information regarding an installation location of the vibration device, and applies vibration according to the acquired weather information to the optical fiber. The interrogator detects vibration applied to the optical fiber by the vibration device, based on an optical signal received from the optical fiber, and determines weather conditions at the installation location of the vibration device, based on the detected vibration.

公开(公告)号：US20220028372A1

公开(公告)日：2022-01-27

申请号：US17276192

申请日：2018-09-20

Applicant: NEC Corporation

Inventor： Tatsuya KOMATSU ,  Reishi KONDO ,  Sakiko MISHIMA

IPC: G10L15/06 ,  G10L15/02 ,  G10L25/27 ,  G10L25/51 ,  G06N20/00

Abstract: The acoustic feature extraction means 82 extracts an acoustic feature, using predetermined parameters, from an acoustic pattern obtained as a result of processing on an acoustic signal. The language vector calculation means 83 calculates a language vector from a given label that represents an attribute of a source of the acoustic signal and that is associated with the acoustic pattern. The similarity calculation means 84 calculates a similarity between the acoustic feature and the language vector. The parameter update means 85 learns parameters so that the similarity becomes larger, and updates the predetermined parameters to the parameters obtained by learning.