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    Phase noise shaping in a distance measurement system
    1.
    发明授权
    Phase noise shaping in a distance measurement system 有权

    公开(公告)号：US12270952B2

    公开(公告)日：2025-04-08

    申请号：US17163601

    申请日：2021-02-01

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Subhash Chandra Venkata Sadhu ,  Bharath Patil

    IPC: G01S7/4915 ,  G01S17/36 ,  G01S17/89 ,  G01S17/894

    Abstract: A distance measurement system includes a light transmitter to generate a modulated light signal, a light sensor to generate measurement signals from reflected light among four quad phase angles with respect to a phase of the generated light signal, and a controller. The controller selects a first set of quad phase angles, and generates first measurement signals at the quad phase angles of the first set. Based on the first measurement signals, the controller computes a first phase angle between the generated light signal and the reflected light signal, generates a second set of quad phase angles based on the first phase angle, and generates second measurement signals at the quad phase angles of the second set. Further, based on the second measurement signals, the controller computes a second phase angle between the generated light signal and the reflected light signal and calculates a distance using the second phase angle.

    Efficient implementation of distance de-aliasing for ranging systems using phase domain computation
    3.
    发明授权
    Efficient implementation of distance de-aliasing for ranging systems using phase domain computation 有权

    公开(公告)号：US10024966B2

    公开(公告)日：2018-07-17

    申请号：US15009332

    申请日：2016-01-28

    Applicant: Texas Instruments Incorporated

    Inventor： Bharath Patil

    IPC: G01C3/08 ,  G01S17/36 ,  G01S17/89 ,  G01S7/491

    Abstract: A system and method for determining a distance to a surface of interest, such as in a Time of Flight (ToF) system, includes projecting modulated electromagnetic radiation of at least two frequencies to a point on the surface of interest, receiving the electromagnetic radiation reflected from the point on the surface of interest and demodulating the received electromagnetic radiation. Whereupon, a weighted phase difference between the frequencies may be calculated, in accordance with the present systems and methods, and one bin for each of the reflected frequencies for an actual distance to the point on the surface of interest is calculated using the weighted phase difference. A final phase of the bin for the actual distance is calculated as a weighted average of the phases of the bins based on the reflected signal strengths, and the actual distance to the point on the surface of interest is then output.

    Phase compensation in a time of flight system
    4.
    发明授权
    Phase compensation in a time of flight system 有权

    公开(公告)号：US11543504B2

    公开(公告)日：2023-01-03

    申请号：US16855287

    申请日：2020-04-22

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Bharath Patil ,  Anjana Sharma ,  Subhash Chandra Venkata Sadhu ,  Ravishankar Ayyagari

    IPC: G01S7/497 ,  G01S17/36 ,  G01S17/894

    Abstract: Systems and methods are provided for imaging a surface via time of flight measurement. An illumination system includes an illumination driver and an illumination source and is configured to project modulated electromagnetic radiation to a point on a surface of interest. A sensor system includes a sensor driver and is configured to receive and demodulate electromagnetic radiation reflected from the surface of interest. A temperature sensor is configured to provide a measured temperature representing a temperature at one of the illumination driver and the sensor driver and located at a position remote from the one of the illumination driver and the sensor driver. A compensation component is configured to calculate a phase offset between the illumination system and the sensor system from at least the measured temperature and a model representing transient heat flow within the system.

    METHOD AND APPARATUS TO MITIGATE RIPPLE IN A TIME OF FLIGHT (TOF) SYSTEM
    6.
    发明申请
    METHOD AND APPARATUS TO MITIGATE RIPPLE IN A TIME OF FLIGHT (TOF) SYSTEM 审中-公开
    在飞行时间（TOF）系统中减轻纹波的方法和装置

    公开(公告)号：US20150308949A1

    公开(公告)日：2015-10-29

    申请号：US14698978

    申请日：2015-04-29

    Applicant: Texas Instruments Incorporated

    Inventor： Subhash Chandra Venkata Sadhu ,  Bharath Patil

    IPC: G01N21/55 ,  H05B37/02 ,  G01J1/46

    CPC classification number: G01J1/46 ,  G01N2223/506 ,  G01S7/484 ,  H05B33/0815 ,  H05B37/0272 ,  Y02B20/346

    Abstract: The disclosure provides a circuit to mitigate ripple. The circuit includes a controller that generates a PWM (pulse width modulated) clock signal. A DC/DC converter receives the PWM clock signal, and generates an output signal. A light source is coupled to the DC/DC converter, and receives the output signal. The light source transmits light pulses during an integration time. A time integral of the output signal during the integration time is constant during a plurality of quad time periods.

    Abstract translation: 本公开提供了一种减轻纹波的电路。 该电路包括产生PWM（脉宽调制）时钟信号的控制器。 DC / DC转换器接收PWM时钟信号，并产生输出信号。 光源耦合到DC / DC转换器，并接收输出信号。 光源在积分时间内传输光脉冲。 积分时间期间的输出信号的时间积分在多个四倍时间段期间是恒定的。

    System and Methods for Depth Imaging using Conventional CCD Image Sensors
    7.
    发明申请
    System and Methods for Depth Imaging using Conventional CCD Image Sensors 审中-公开
    使用传统CCD图像传感器的深度成像系统和方法

    公开(公告)号：US20150062306A1

    公开(公告)日：2015-03-05

    申请号：US14472060

    申请日：2014-08-28

    Applicant: Texas Instruments Incorporated

    Inventor： Ravishankar S. Ayyagari ,  Bharath Patil ,  Shantanu Prasad Prabhudesai

    IPC: H04N13/02 ,  H04N5/33 ,  H04N5/372

    CPC classification number: H04N5/33 ,  G01S7/4816 ,  G01S7/4914 ,  G01S7/4915 ,  G01S17/36 ,  G01S17/89 ,  H04N5/372 ,  H04N13/271

    Abstract: Systems and methods for providing depth imaging using a CCD image sensor. In a method for visual imaging and depth imaging, steps include providing a CCD image sensor device arranged to receive light from an optical lens and having an array of pixels and corresponding pixel charge storage elements; providing a light source for transmitting light pulses responsive to a pulse control signal; providing timing signals to configure the CCD image sensor to collect and store charge from the pixel storage elements; and performing a depth calculation using a background charge, a reflected charge, and a depth charge collected in three frame periods for each pixel in the CCD image sensor. A system including a CCD image sensor for use with the embodiments is disclosed. Additional embodiments are disclosed.

    Abstract translation: 使用CCD图像传感器提供深度成像的系统和方法。 在用于可视成像和深度成像的方法中，步骤包括提供CCD图像传感器装置，其被配置为从光学透镜接收光并具有像素阵列和对应的像素电荷存储元件; 提供响应于脉冲控制信号发送光脉冲的光源; 提供定时信号以配置CCD图像传感器以从像素存储元件收集和存储电荷; 并且使用CCD图像传感器中的每个像素的三帧周期中收集的背景电荷，反射电荷和深度电荷来进行深度计算。 公开了一种包括用于实施例的CCD图像传感器的系统。 公开了另外的实施例。

    Phase anti-aliasing using spread-spectrum techniques in an optical distance measurement system
    8.
    发明授权
    Phase anti-aliasing using spread-spectrum techniques in an optical distance measurement system 有权

    公开(公告)号：US10852402B2

    公开(公告)日：2020-12-01

    申请号：US15834178

    申请日：2017-12-07

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Subhash Chandra Venkata Sadhu ,  Bharath Patil ,  Jaiganesh Balakrishnan

    IPC: G01S7/4865 ,  G01S17/89 ,  G01S7/484 ,  G01S7/486 ,  G01S17/10 ,  G01S7/4911 ,  G01S17/34

    Abstract: A three dimensional time of flight (TOF) camera includes a transmitter and a receiver. The transmitter is configured to generate an electrical transmit signal at a plurality of frequencies over an integration time period and generate a transmit optical waveform corresponding with the electrical transmit signal. The receiver is configured to receive a reflected optical waveform that is the transmit optical waveform reflected off of an object, integrate the reflected optical waveform over the integration time period, and determine a distance to the target object based on a TOF of the optical waveform. The integration time period includes exposure time periods. A length of each of the exposure time periods corresponds to one of the frequencies. The TOF is determined based on a correlation of the electrical transmit signal and the return optical waveform utilizing a correlation function with respect to the integration time period.

    Single wire communications interface and protocol
    10.
    发明授权
    Single wire communications interface and protocol 有权

    公开(公告)号：US10108578B2

    公开(公告)日：2018-10-23

    申请号：US14482474

    申请日：2014-09-10

    Applicant: Texas Instruments Incorporated

    Inventor： Ravishankar S. Ayyagari ,  Supreet Joshi ,  Bharath Patil ,  Madhav Tejaswi Boddhapu

    IPC: G06F13/00 ,  G06F13/42 ,  G06F13/40

    Abstract: In a single wire communications interface embodiment, a single wire is coupled between a master device and at least one slave device, the master device configured for transmitting data words as serial data to and for receiving data words as serial data from the at least one slave device, and the at least one slave device configured for transmitting data words as serial data to and receiving data words as serial data from the master device; wherein prior to transmission of any data word on the single wire by one of the master device and the slave device, a sync pulse is first transmitted on the single wire. Integrated circuit embodiments for implementing the single wire communications interface, and method embodiments incorporating the single wire communications interface are disclosed. Additional embodiments are disclosed.

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