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    On-demand heart rate estimation based on optical measurements
    2.
    发明授权
    On-demand heart rate estimation based on optical measurements 有权

    公开(公告)号：US10285651B2

    公开(公告)日：2019-05-14

    申请号：US15198438

    申请日：2016-06-30

    Applicant: ANALOG DEVICES, INC.

    Inventor： Sefa Demirtas ,  Jason D. King ,  Robert Adams ,  Tony Joseph Akl ,  Jeffrey G. Bernstein

    IPC: A61B5/00 ,  A61B5/024 ,  A61B5/11

    Abstract: Activity monitors and smart watches utilizing optical measurements are becoming widely popular, and users expect to get an increasingly accurate estimate of their heart rate (HR) from these devices. These devices are equipped with a light source and an optical sensor which enable estimation of HR using a technique called photoplethysmography (PPG). One of the main challenges of HR estimation using PPG is the coupling of motion into the optical PPG signal when the user is moving randomly or exercising. The present disclosure describes a computationally feasible and fast HR estimation algorithm to be executed at instances of little or no motion. Resulting HR readings may be useful on their own, or be provided to systems that monitor HR continuously to prevent the problem of such systems being locked on an incorrect HR for long periods of time. Implementing techniques described herein leads to more accurate HR measurements.

    TRACKING MECHANISM FOR HEART RATE MEASUREMENTS
    3.
    发明申请
    TRACKING MECHANISM FOR HEART RATE MEASUREMENTS 有权
    跟踪机制用于心率测量

    公开(公告)号：US20160317097A1

    公开(公告)日：2016-11-03

    申请号：US14972447

    申请日：2015-12-17

    Applicant: ANALOG DEVICES, INC.

    Inventor： Robert Adams ,  Sefa Demirtas ,  Jeffrey G. Bernstein

    IPC: A61B5/00 ,  A61B5/024

    CPC classification number: A61B5/721 ,  A61B5/02416 ,  A61B5/02438 ,  A61B5/11 ,  A61B5/725 ,  A61B5/7275 ,  A61B2562/0219 ,  A61B2562/0233 ,  G06F19/00

    Abstract: Heart rate monitors are plagued by noisy photoplethysmography (PPG) data, which makes it difficult for the monitors to output a consistently accurate heart rate reading. Noise is often caused by motion. Using known methods for processing accelerometer readings that measure movement to filter out some of this noise may help, but not always. The present disclosure describes an improved front-end technique (time-domain interference removal) based on using adaptive linear prediction on accelerometer data to generate filters for filtering the PPG signal prior to tracking the frequency of the heartbeat (heart rate). The present disclosure also describes an improved back-end technique based on steering the frequency of a resonant filter in order to track the heartbeat. Implementing one or both of these techniques leads to more accurate heart rate measurements.

    Abstract translation: 心率监测器受到嘈杂的光谱体积描记术（PPG）数据的困扰，这使得监测仪难以输出一致的心率读数。 噪音通常由运动引起。 使用已知的处理加速度计读数的方法来测量移动以滤除某些噪声可能有助于，但不总是。 本公开描述了基于在加速度计数据上使用自适应线性预测来生成用于在跟踪心跳频率（心率）之前对PPG信号进行滤波的滤波器的改进的前端技术（时域干扰消除）。 本公开还描述了基于转向谐振滤波器的频率以便跟踪心跳的改进的后端技术。 实施这些技术中的一种或两种导致更准确的心率测量。

    Built-in calibration of time-of-flight depth imaging systems
    4.
    发明授权
    Built-in calibration of time-of-flight depth imaging systems 有权

    公开(公告)号：US11961257B2

    公开(公告)日：2024-04-16

    申请号：US17892405

    申请日：2022-08-22

    Applicant: Analog Devices, Inc.

    Inventor： Charles Mathy ,  Brian C. Donnelly ,  Nicolas Le Dortz ,  Sefa Demirtas

    IPC: G06T7/80 ,  G01S7/497 ,  G01S17/89

    CPC classification number: G06T7/80 ,  G01S7/497 ,  G01S17/89 ,  G06T2207/10028

    Abstract: An image processing system having on-the-fly calibration uses the placement of the imaging sensor and the light source for calibration. The placement of the imaging sensor and light source with respect to each other affect the amount of signal received by a pixel as a function of distance to a selected object. For example, an obstruction can block the light emitter, and as the obstruction is positioned an increasing distance away from the light emitter, the signal level increases as light rays leave the light emitters, bounce off the obstruction and are received by the imaging sensor. The system includes a light source configured to emit light, and an image sensor to collect incoming signals including reflected light, and a processor to determine a distance measurement at each of the pixels and calibrate the system.

    Designing FIR filters with globally minimax-optimal magnitude response
    6.
    发明授权
    Designing FIR filters with globally minimax-optimal magnitude response 有权

    公开(公告)号：US10044386B2

    公开(公告)日：2018-08-07

    申请号：US15271487

    申请日：2016-09-21

    Applicant: ANALOG DEVICES, INC.

    Inventor： Sefa Demirtas

    IPC: H03D1/00 ,  H04B1/10 ,  H04L25/03

    Abstract: Embodiments of the present disclosure provide mechanisms that enable designing an FIR filter that would have a guaranteed globally optimal magnitude response in terms of the minimax optimality criterion given a desired weight on the error in the stopband versus the passband. Design of such a filter is based on a theorem (“characterization theorem”) that provides an approach for characterizing the global minimax optimality of a given FIR filter h[n], n=0, 1, . . . , N, where optimality is evaluated with respect to a magnitude response of this filter, |H(ejω)|, as compared to the desired filter response, D(ω), which is unity in the passband and zero in the stopband. The characterization theorem enables characterizing optimality for both real-valued and complex-valued filter coefficients, and does not require any symmetry in the coefficients, thus being applicable to all non-linear phase FIR filters.

    Built-in calibration of time-of-flight depth imaging systems
    8.
    发明授权
    Built-in calibration of time-of-flight depth imaging systems 有权

    公开(公告)号：US11423572B2

    公开(公告)日：2022-08-23

    申请号：US16664453

    申请日：2019-10-25

    Applicant: Analog Devices, Inc.

    Inventor： Charles Mathy ,  Brian C. Donnelly ,  Nicolas Le Dortz ,  Sefa Demirtas

    IPC: G06K9/00 ,  G06T7/80 ,  G01S7/497 ,  G01S17/89

    Abstract: An image processing system having on-the-fly calibration uses the placement of the imaging sensor and the light source for calibration. The placement of the imaging sensor and light source with respect to each other affect the amount of signal received by a pixel as a function of distance to a selected object. For example, an obstruction can block the light emitter, and as the obstruction is positioned an increasing distance away from the light emitter, the signal level increases as light rays leave the light emitters, bounce off the obstruction and are received by the imaging sensor. The system includes a light source configured to emit light, and an image sensor to collect incoming signals including reflected light, and a processor to determine a distance measurement at each of the pixels and calibrate the system.

    Measuring and removing the corruption of time-of-flight depth images due to internal scattering
    9.
    发明授权
    Measuring and removing the corruption of time-of-flight depth images due to internal scattering 有权

    公开(公告)号：US11092678B2

    公开(公告)日：2021-08-17

    申请号：US16387385

    申请日：2019-04-17

    Applicant: Analog Devices, Inc.

    Inventor： Erik D. Barnes ,  Charles Mathy ,  Sefa Demirtas

    IPC: G01S7/487 ,  G01S7/48 ,  G01S17/10 ,  H04N5/225 ,  H04N5/243 ,  G01S17/894

    Abstract: Depth imagers can implement time-of-flight operations to measure depth or distance of objects. A depth imager can emit light onto a scene and sense light reflected back from the objects in the scene using an array of sensors. Timing of the reflected light hitting the array of sensors gives information about the depth or distance of objects in the scene. In some cases, corrupting light that is outside of a field of view of a pixel in the array of sensors can hit the pixel due to internal scattering or internal reflections occurring in the depth imager. The corrupting light can corrupt the depth or distance measurement. To address this problem, an improved depth imager can isolate and measure the corrupting light due to internal scattering or internal reflections occurring in the depth imager, and systematically remove the measured corrupting light from the depth or distance measurement.

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