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    Use of doppler shift as a basis to determine area of focus
    2.
    发明授权
    Use of doppler shift as a basis to determine area of focus 有权

    公开(公告)号：US12114042B2

    公开(公告)日：2024-10-08

    申请号：US18148746

    申请日：2022-12-30

    Applicant: The Nielsen Company (US), LLC

    Inventor： John Thomas LiVoti ,  Stanley Wellington Woodruff

    IPC: H04N21/442 ,  G01S15/58 ,  G10L19/018 ,  H04N21/439

    CPC classification number: H04N21/44218 ,  G01S15/586 ,  G10L19/018 ,  H04N21/4394

    Abstract: A method system for use of Doppler shift as a basis to detect user focus, such as to detect that a user was attracted to audio media and/or to an associated object. A portable processing device carried by the user receives audio media emitted from an audio source at a fixed location, the audio media having periodic watermarking encoded at a baseline frequency. The portable processing device detects a change in frequency of the periodic watermarking over time, such as the frequency progressing from at least being higher than the baseline frequency to being the baseline frequency for at least a predefined threshold period of time. Based on the detected change in frequency of the periodic watermarking over time, the portable device then provides a report indicating that the user was attracted to the audio media and/or to an object (e.g., a commercial object) collocated with the audio source.

    METHOD FOR CALCULATING FORWARD ACOUSTIC SCATTERING DOPPLER FREQUENCY SHIFT OF UNDERWATER MOVING TARGET UNDER IRREGULAR TRAJECTORY
    4.
    发明公开
    METHOD FOR CALCULATING FORWARD ACOUSTIC SCATTERING DOPPLER FREQUENCY SHIFT OF UNDERWATER MOVING TARGET UNDER IRREGULAR TRAJECTORY 审中-公开

    公开(公告)号：US20240295652A1

    公开(公告)日：2024-09-05

    申请号：US18268145

    申请日：2022-02-16

    Applicant: INSTITUTE OF OCEANOGRAPHIC INSTRUMENTATION, SHANDONG ACADEMY OF SCIENCES

    Inventor： Chuanlin HE ,  Yang YU ,  Shouyang SUN ,  Jianbo MA ,  Hongmin LV

    IPC: G01S15/58 ,  G01S15/00

    CPC classification number: G01S15/58 ,  G01S15/003

    Abstract: The invention involves a method for calculating a forward acoustic scattering Doppler frequency shift of an underwater moving target under an irregular trajectory, comprising: (1) converting earth longitude and latitude coordinates of a transmitting end, a target trajectory, and a receiving end into rectangular coordinates, and sequentially marking the coordinates as (xS, yS), (xT, yT), and (xR, yR) (2) recording a target trajectory coordinate sequence as (xT(ti), yT(ti)), wherein i=1, 2, . . . , N, and calculating an average navigation speed ν within all time periods. (3) performing smoothing processing on the target trajectory to obtain a virtual straight trajectory, and respectively calculating horizontal distances from the target and the receiving end to an intersection of the virtual linear trajectory and a baseline, and an included angle between the virtual straight trajectory and the baseline; and (4) calculating the forward acoustic scattering Doppler frequency shift of the target at each time point by using the parameters calculated in steps (2) and (3).

    Device calibration for presence detection using ultrasonic signals
    7.
    发明授权
    Device calibration for presence detection using ultrasonic signals 有权

    公开(公告)号：US11513216B1

    公开(公告)日：2022-11-29

    申请号：US17171455

    申请日：2021-02-09

    Applicant: Amazon Technologies, Inc.

    Inventor： Krishna Kamath Koteshwara ,  Rui Wang ,  Tarun Pruthi

    IPC: G01S15/58 ,  G01S7/527 ,  H04R3/00 ,  H04R1/40 ,  G01S15/04

    Abstract: Techniques for calibrating presence-detection devices to account for various factors that can affect the presence-detection devices' ability to detect movement. Presence-detection devices may detect movement of a person in an environment by emitting ultrasonic signals into the environment, and characterizing the change in the frequency, or the Doppler shift, of the reflections of the ultrasonic signals off the person caused by the movement of the person. However, factors such as environmental acoustic conditions, noise sources, etc., may affect the ability of the presence-detection devices to detect movement. To calibrate for these factors, the presence-detection devices may use a loudspeaker to emit an ultrasonic sweep signal that spans different frequencies in an ultrasonic frequency range. The presence-detection devices may generate audio data using a microphone that represents the ultrasonic sweep signal, and analyze that audio data to determine an optimal frequency range and/or transmission power for subsequent ultrasonic signal transmissions.

    Iterative learning adaptive sonar system, apparatus, method, and computer program product
    8.
    发明授权
    Iterative learning adaptive sonar system, apparatus, method, and computer program product 有权

    公开(公告)号：US11500082B2

    公开(公告)日：2022-11-15

    申请号：US16681263

    申请日：2019-11-12

    Applicant: Lockheed Martin Corporation

    Inventor： Anil P. Chinnan

    IPC: G01S7/53 ,  G01S15/58 ,  G06N5/04 ,  G06N7/00 ,  G06N20/00

    Abstract: A learning SONAR system and method including receiving, at an input, mission parameters including one or more of mission accuracy, mission covertness, learning rate, and training matrix dependency; transmitting pulsed signals; receiving return pulsed signals, for instance, using a tunable acoustic receiver having controllable receiver elements; and determining a number of the controllable receiver elements to generate estimates of altitude and 3D velocity based on a combination of transmit power, signal-to-noise ratio, and altitude range using an adaptive spatial sampler of a learning controller.

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