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    MOTION DETECTION AND CANCELLATION USING AMBIENT LIGHT
    2.
    发明申请
    MOTION DETECTION AND CANCELLATION USING AMBIENT LIGHT 审中-公开

    公开(公告)号：US20190175037A1

    公开(公告)日：2019-06-13

    申请号：US15835646

    申请日：2017-12-08

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Sarma Sundareswara GUNTURI ,  Jaiganesh BALAKRISHNAN

    IPC: A61B5/024

    Abstract: An apparatus to detect a heart rate of a user includes a motion detection circuit configured to generate a motion status signal indicative of a motion status of the user. The apparatus also comprises a filter circuit coupled to the motion detection circuit that is configured to generate a filter circuit output signal based on dynamically variable. The coefficients are dependent on the motion status signal and a first signal received by the filter circuit. The apparatus also comprises a combination circuit coupled to the filter circuit and configured to receive a second signal indicative of the ambient light, the motion of the user, and non-ambient light reflected from the user. The combination circuit is configured to determine a difference between the second signal and the filter circuit output signal to generate a combination circuit output signal.

    Filtered Coarse Mixer Based Digital Down-Converter for RF Sampling ADCs
    4.
    发明申请
    Filtered Coarse Mixer Based Digital Down-Converter for RF Sampling ADCs 有权

    公开(公告)号：US20220173947A1

    公开(公告)日：2022-06-02

    申请号：US17538460

    申请日：2021-11-30

    Applicant: Texas Instruments Incorporated

    Inventor： Jaiganesh BALAKRISHNAN ,  Nagalinga Swamy Basayya AREMALLAPUR ,  Aswath VS

    IPC: H04L27/14

    Abstract: A digital down converter (DDC) that improves efficiency by taking advantage of the periodicity of the coarse mixing process and the memory inherent in the convolution operation performed by decimation filters. In embodiments, the DDC filters and decimates a received signal to generate subfilter outputs and coarse mixes the subfilter outputs for each frequency band of interest. Accordingly, the DDC eliminates the need for separate decimation filters for each of the in-phase (I-phase) and quadrature (Q-phase) signals of each frequency band. In some embodiments, for each frequency band, the DDC combines the subfilter outputs into partial sums for each of the I- and Q-phases. In some of those embodiments, the coarse mixing operation is performed by multiplying the partial sums by real multiplicands and performing a simple post-rotation operation. In those embodiments, the DDC significantly reduces the number of multiplication operations required to perform the coarse mixing process.

    REDUCED POWER TRANSMITTER DURING STANDBY MODE
    5.
    发明申请
    REDUCED POWER TRANSMITTER DURING STANDBY MODE 有权

    公开(公告)号：US20210176005A1

    公开(公告)日：2021-06-10

    申请号：US16936065

    申请日：2020-07-22

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Sanjay PENNAM ,  Vamsi Krishna KANDALLA ,  Brahmendra Reddy YATHAM ,  Shailesh WARDHEN ,  Jaiganesh BALAKRISHNAN ,  Jawaharlal TANGUDU

    IPC: H04L1/00 ,  H04B1/04

    Abstract: A transmitter includes a data stream encoder layer having an output and a pattern generator having a bit pattern output. The transmitter further includes a first multiplexer having first and second inputs and a first multiplexer output. The first input is coupled to the output of the data stream encoder layer, and the second input is coupled to the bit pattern output of the pattern generator. While at least a portion of the data stream encoder layer is powered down, the pattern generator is configured to provide bit patterns on its bit pattern output, a control signal to the first multiplexer is configured to select the second input of the first multiplexer, and the first multiplexer is configured to output the bit patterns on the output of the first multiplexer.

    DIGITAL UPCONVERTER FOR RADIO FREQUENCY SAMPLING TRANSMITTER
    6.
    发明申请
    DIGITAL UPCONVERTER FOR RADIO FREQUENCY SAMPLING TRANSMITTER 有权

    公开(公告)号：US20210119661A1

    公开(公告)日：2021-04-22

    申请号：US17072104

    申请日：2020-10-16

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Sriram MURALI ,  Jaiganesh BALAKRISHNAN ,  Pooja SUNDAR ,  Harshavardhan ADEPU ,  Wenjing LU ,  Yeswanth GUNTUPALLI

    IPC: H04B1/40 ,  H04B1/00

    Abstract: A digital up-converter (DUC) includes conjugate-mixer-combiner. The conjugate-mixer-combiner includes a pre-combiner configured to generate combinations of a first in-phase (I) value to be transmitted at a first frequency of a first frequency band, a first quadrature (Q) value to be transmitted at the first frequency of a first frequency band, a second I value for to be transmitted at a second frequency of a second frequency band, and a second Q value to be transmitted at the second frequency of a second frequency band. The conjugate-mixer-combiner further includes a plurality of multipliers collectively configured to shift the combinations based on an average difference between the first frequency and the second frequency.

    MOTION DETECTION AND CANCELLATION USING AMBIENT LIGHT
    7.
    发明申请
    MOTION DETECTION AND CANCELLATION USING AMBIENT LIGHT 有权

    公开(公告)号：US20210100463A1

    公开(公告)日：2021-04-08

    申请号：US17123165

    申请日：2020-12-16

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Sarma Sundareswara GUNTURI ,  Jaiganesh BALAKRISHNAN

    IPC: A61B5/024 ,  A61B5/00

    Abstract: An apparatus to detect a heart rate of a user includes a motion detection circuit configured to generate a motion status signal indicative of a motion status of the user. The apparatus also comprises a filter circuit coupled to the motion detection circuit that is configured to generate a filter circuit output signal based on dynamically variable. The coefficients are dependent on the motion status signal and a first signal received by the filter circuit. The apparatus also comprises a combination circuit coupled to the filter circuit and configured to receive a second signal indicative of the ambient light, the motion of the user, and non-ambient light reflected from the user. The combination circuit is configured to determine a difference between the second signal and the filter circuit output signal to generate a combination circuit output signal.

    PHASE ANTI-ALIASING USING SPREAD-SPECTRUM TECHNIQUES IN AN OPTICAL DISTANCE MEASUREMENT SYSTEM
    8.
    发明申请
    PHASE ANTI-ALIASING USING SPREAD-SPECTRUM TECHNIQUES IN AN OPTICAL DISTANCE MEASUREMENT SYSTEM 有权

    公开(公告)号：US20210041541A1

    公开(公告)日：2021-02-11

    申请号：US17077315

    申请日：2020-10-22

    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.

    ANALOG-DIGITAL COMPATIBLE RE-SAMPLING
    9.
    发明申请
    ANALOG-DIGITAL COMPATIBLE RE-SAMPLING 有权
    模拟数字兼容再采样

    公开(公告)号：US20170063575A1

    公开(公告)日：2017-03-02

    申请号：US15246248

    申请日：2016-08-24

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Jaiganesh BALAKRISHNAN ,  Jawaharlal TANGUDU ,  Sreenath Potty NARAYANAN

    IPC: H04L25/03 ,  H04L12/26 ,  H04L12/741

    CPC classification number: H04L25/03006 ,  H04L43/022 ,  H04L45/745

    Abstract: A re-sampler comprises: a plurality of multipliers configured to receive an input sample; and a plurality of accumulators coupled to the multipliers and configured to form multiplier-accumulator (MAC) units with the multipliers, wherein the MAC units are configured to: compute partial products from the input sample, accumulate the partial products over clock cycles, and sequentially generate output samples based on the computing and the accumulating. A method comprises: receiving input samples; computing partial products from the input samples; accumulating the partial products over clock cycles; and sequentially generating output samples based on the computing and the accumulating.

    Abstract translation: 重新取样器包括：多个乘法器，被配置为接收输入样本; 以及多个累加器，其耦合到所述乘法器并且被配置为与所述乘法器形成乘法器累加器（MAC）单元，其中所述MAC单元被配置为：从所述输入样本计算部分乘积，在时钟周期内累积所述部分乘积， 基于计算和累积生成输出样本。 一种方法包括：接收输入样本; 从输入样本计算部分产品; 在时钟周期内积累部分产品; 并基于计算和累加顺序产生输出样本。

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