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    METHOD PROVIDING INCREASED SIGNAL-TO-NOISE (SNR) FOR COHERENT DISTRIBUTED ACOUSTIC SENSING
    71.
    发明申请
    METHOD PROVIDING INCREASED SIGNAL-TO-NOISE (SNR) FOR COHERENT DISTRIBUTED ACOUSTIC SENSING 审中-公开

    公开(公告)号：WO2022140483A1

    公开(公告)日：2022-06-30

    申请号：PCT/US2021/064751

    申请日：2021-12-21

    Applicant: NEC LABORATORIES AMERICA, INC.

    Inventor： HU, Junqiang ,  WANG, Ting ,  MURAKAMI, Shuji

    IPC: G01H9/00 ,  G01D5/353

    Abstract: A distributed acoustic sensing ( DAS) method that utilizes a differential phase to detect phase change(s) between two locations of a DAS sensing fiber to ascertain vibrational / acoustic activities / environment at intermediary fiber location(s) between the two locations. Additionally, a fiber coil comprising a segment of fiber wrapped in acoustic sensitive material ("acoustic signal collector") wherein the material responds to an acoustic signal, which results in strain(s) applied to the fiber. Rather than using a measured phase difference between the two ends of the fiber coil, we utilize all samples collected from one end of the fiber coil to the other end of the fiber coil. Every two samples covering a partial or an entire section of the fiber coil are used as a pair to determine a phase difference and the results from all the pairs are averaged to form one output exhibiting a reduced noise level.

    VIBRATION DETECTION USING PHASE RECOVERED FROM AN OPTICAL TRANSPONDER WITH COHERENT DETECTION
    72.
    发明申请
    VIBRATION DETECTION USING PHASE RECOVERED FROM AN OPTICAL TRANSPONDER WITH COHERENT DETECTION 审中-公开

    公开(公告)号：WO2022125705A1

    公开(公告)日：2022-06-16

    申请号：PCT/US2021/062478

    申请日：2021-12-08

    Applicant: NEC LABORATORIES AMERICA, INC. [US]/[US]

    Inventor： IP, Ezra ,  HUANG, Yue-Kai

    IPC: G01H9/00 ,  G01D5/353

    Abstract: Aspects of the present disclosure describe systems, methods. and structures for vibration detection using phase recovered from an optical transponder with coherent detection. Advantageously, our systems, methods, and structures leverage contemporary digital coherent receiver architecture in which various adaptive DSP operations performed to recover transmitted data track optical phase. The phase is extracted at low overhead cost, allowing a digital coherent transponder to perform vibration detection / monitoring as an auxiliary function to data transmission. Demonstration of vibration detection and localization based on the extraction of optical phase from payload-carrying telecommunications signal using a coherent receiver in a bidirectional WDM transmission system is shown and described.

    ACTION RECOGNITION WITH HIGH-ORDER INTERACTION THROUGH SPATIAL-TEMPORAL OBJECT TRACKING
    80.
    发明申请
    ACTION RECOGNITION WITH HIGH-ORDER INTERACTION THROUGH SPATIAL-TEMPORAL OBJECT TRACKING 审中-公开

    公开(公告)号：WO2021050772A1

    公开(公告)日：2021-03-18

    申请号：PCT/US2020/050254

    申请日：2020-09-10

    Applicant: NEC LABORATORIES AMERICA, INC.

    Inventor： LAI, Farley ,  KADAV, Asim ,  CHEN, Jie

    IPC: G06K9/00 ,  G06N3/04

    Abstract: Aspects of the present disclosure describe systems, methods, and structures that provide action recognition with high-order interaction with spatio-temporal object tracking. Image and object features are organized into tracks, which advantageously facilitates many possible learnable embeddings and intra/inter-track interaction(s). Operationally, our systems, method, and structures according to the present disclosure employ an efficient high-order interaction model to learn embeddings and intra/inter object track interaction across the space and time for AR. Each frame is detected by an object detector to locate visual objects. Those objects are linked through time to form object tracks. The object tracks are then organized and combined with the embeddings as the input to our model. The model is trained to generate representative embeddings and discriminative video features through high-order interaction which is formulated as an efficient matrix operation without iterative processing delay.

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