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    Sensor with low power model based feature extractor
    12.
    发明授权
    Sensor with low power model based feature extractor 有权
    传感器采用低功耗型功能提取器

    公开(公告)号：US09397685B1

    公开(公告)日：2016-07-19

    申请号：US14806826

    申请日：2015-07-23

    Applicant: Texas Instruments Incorporated

    Inventor： Sriram Narayanan ,  Srinath Mathur Ramaswamy ,  Arup Polley ,  Ajit Sharma

    IPC: H03M1/00 ,  H03M1/12

    CPC classification number: H03M1/1245

    Abstract: Described examples include low power analog front end circuits for sensing repeating signal waveforms, including a first sampling circuit to sample an input signal, an analog detector circuit to provide a detector output signal representing a feature of the input signal, a second sampling circuit to sample the detector output signal, and a control circuit to control a sample rate or other analog front end operating parameter at least partially according to the sampled detector output signal, and to selectively enable and disable the analog detector circuit at least partially according to a model representing an expected repeating waveform of the input signal.

    Abstract translation: 所描述的示例包括用于感测重复信号波形的低功率模拟前端电路，包括用于对输入信号进行采样的第一采样电路，模拟检测器电路，以提供表示输入信号特征的检测器输出信号，第二采样电路 检测器输出信号，以及控制电路，用于至少部分地根据采样的检测器输出信号来控制采样率或其他模拟前端工作参数，并且至少部分地根据代表的模型来选择性地启用和禁用模拟检测器电路 预期的输入信号的重复波形。

    CODED ULTRASONIC SENSING WITH STAGGERED BURSTS
    14.
    发明申请
    CODED ULTRASONIC SENSING WITH STAGGERED BURSTS 有权

    公开(公告)号：US20240411017A1

    公开(公告)日：2024-12-12

    申请号：US18393905

    申请日：2023-12-22

    Applicant: Texas Instruments Incorporated

    Inventor： LEI DING ,  Srinath Mathur Ramaswamy ,  Anand Gopalan ,  Vaibhav Garg ,  Anand Ganesh Dabak

    IPC: G01S15/10 ,  G01S7/526 ,  G01S15/931

    Abstract: In one example, a method comprises using a first transducer, emitting a first acoustic signal representing a first code. The method further comprises using the first transducer, receiving a second acoustic signal, and converting the second acoustic signal to a sensor signal. The method further comprises computing a time-of-flight for the second acoustic signal based on a time difference between when the first transducer emits the first acoustic signal and when the first transducer receives the second acoustic signal. The method further comprises responsive to the correlation result indicating that the third acoustic signal is a reflection of a third acoustic signal emitted by a second transducer: determining a delay time between when the first transducer emits the first acoustic signal and when the second transducer emits the third acoustic signal; adjusting the time-of-flight based on the delay time; and providing a distance measurement based on the adjusted time-of-flight.

    Ultrasonic equalization and gain control for smart speakers
    15.
    发明授权
    Ultrasonic equalization and gain control for smart speakers 有权

    公开(公告)号：US11971476B2

    公开(公告)日：2024-04-30

    申请号：US17364011

    申请日：2021-06-30

    Applicant: Texas Instruments Incorporated

    Inventor： Lei Ding ,  Srinath Mathur Ramaswamy ,  Brian Burk ,  Baher Haroun

    IPC: G01S15/00 ,  G01S15/04

    CPC classification number: G01S15/04

    Abstract: Ultrasonic audio processing circuitry and a method useful in ultrasonic presence detection. An ultrasonic burst generator produces an ultrasonic burst signal at one or more ultrasonic frequencies, and an equalizer equalizes that ultrasonic burst signal according to frequency response characteristics of the speaker and microphone at those ultrasonic frequencies. Driver circuitry drives a speaker with the ultrasonic burst signal, which may be combined with an audible audio signal. An ultrasonic separation filter separates an ultrasonic portion from a signal received at a microphone, and processing circuitry is provided to determine a delay time of an echo corresponding to the ultrasonic burst signal in that separated ultrasonic portion of the received signal. In another aspect, the equalizer equalizes an ultrasonic portion of the signal received at a microphone, according to frequency response characteristics of the speaker and microphone at the ultrasonic frequencies of the burst.

    Magnetic current sensing
    16.
    发明授权
    Magnetic current sensing 有权

    公开(公告)号：US11885834B2

    公开(公告)日：2024-01-30

    申请号：US17463112

    申请日：2021-08-31

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Lei Ding ,  Srinath Mathur Ramaswamy ,  Dok Won Lee ,  Baher Haroun ,  Wai Lee ,  Steven John Loveless

    IPC: G01R15/20 ,  G01R19/10

    CPC classification number: G01R15/202 ,  G01R19/10

    Abstract: In a described example, a circuit includes a sensor circuit including multiple magnetic field sensors having respective sensor outputs. The magnetic field sensors are configured to provide magnetic field sensor signals at the respective sensor outputs representative of a measure of current flow through a conductive structure. A combiner interface has combiner inputs and a combiner output. The combiner inputs are coupled to the respective sensor outputs. The combiner interface is configured to provide an aggregate sensor measurement at the combiner output responsive to the magnetic field sensor signals, in which the aggregate sensor measurement is decoupled from magnetic fields generated responsive to the current flow through the conductive structure.

    Ultrasonic Equalization and Gain Control for Smart Speakers
    17.
    发明申请
    Ultrasonic Equalization and Gain Control for Smart Speakers 有权

    公开(公告)号：US20230003880A1

    公开(公告)日：2023-01-05

    申请号：US17364011

    申请日：2021-06-30

    Applicant: Texas Instruments Incorporated

    Inventor： Lei Ding ,  Srinath Mathur Ramaswamy ,  Brian Burk ,  Baher Haroun

    IPC: G01S15/04

    Abstract: Ultrasonic audio processing circuitry and a method useful in ultrasonic presence detection. An ultrasonic burst generator produces an ultrasonic burst signal at one or more ultrasonic frequencies, and an equalizer equalizes that ultrasonic burst signal according to frequency response characteristics of the speaker and microphone at those ultrasonic frequencies. Driver circuitry drives a speaker with the ultrasonic burst signal, which may be combined with an audible audio signal. An ultrasonic separation filter separates an ultrasonic portion from a signal received at a microphone, and processing circuitry is provided to determine a delay time of an echo corresponding to the ultrasonic burst signal in that separated ultrasonic portion of the received signal. In another aspect, the equalizer equalizes an ultrasonic portion of the signal received at a microphone, according to frequency response characteristics of the speaker and microphone at the ultrasonic frequencies of the burst.

    MAGNETIC SENSOR ARRAY PROCESSING FOR INTERFERENCE REDUCTION
    20.
    发明申请
    MAGNETIC SENSOR ARRAY PROCESSING FOR INTERFERENCE REDUCTION 有权

    公开(公告)号：US20230052689A1

    公开(公告)日：2023-02-16

    申请号：US17875840

    申请日：2022-07-28

    Applicant: Texas Instruments Incorporated

    Inventor： Lei Ding ,  Srinath Mathur Ramaswamy ,  Dok Won Lee ,  Steven Howard

    IPC: G01R33/07 ,  G01R19/02 ,  H02M1/00

    Abstract: Current sensing techniques. In an example, a current sensing method includes: generating a first magnetic field measurement; generating a second magnetic field measurement; generating a frequency estimate of a current; calculating a root-mean-square (RMS) value of an estimated amplitude of the current; and generating a temperature estimate of an integrated circuit (IC) configured to perform the method. The method also includes generating a first weighting factor and a second weighting factor based on the frequency estimate, the RMS value, and the temperature estimate, the first weighting factor to control amplification of the first magnetic field measurement and the second weighting factor to control amplification of the second magnetic field measurement.

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