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    Ultrasound lens cleaner driver with frequency selectable oscillator
    1.
    发明授权
    Ultrasound lens cleaner driver with frequency selectable oscillator 有权

    公开(公告)号：US09667191B2

    公开(公告)日：2017-05-30

    申请号：US14799309

    申请日：2015-07-14

    Applicant: Texas Instruments Incorporated

    Inventor： Yunhong Li ,  Wei Ma

    IPC: H03B5/12 ,  H04N5/225 ,  G02B27/00

    CPC classification number: H03B5/1203 ,  G02B27/0006 ,  H03B5/1231 ,  H03B5/1265 ,  H04N5/2171 ,  H04N5/2252 ,  H04N5/2254

    Abstract: A frequency selectable driver circuit (driver circuit) includes a current drive transistor between a first and second node for driving a frequency selectable oscillator (FSO) coupled therebetween that includes a first LC network including an inductor L2 and a capacitor C2 in series and a second LC network in series with the first LC network. The second LC network includes a capacitor bank including capacitors in parallel including switches for switching (selectable capacitors) and an inductor L3 in parallel to the capacitor bank. Values of L2 and C2 provide a low frequency point fL which the LC network is overall capacitive, and in a frequency range between fa and fb above fL with only a portion of selectable capacitors selected a capacitance of the capacitor bank and value of L3 results in an overall impedance for the second LC network that is capacitive between fa and fb and inductive elsewhere.

    Method and circuitry for direction of arrival estimation using microphone array with a sharp null
    2.
    发明授权
    Method and circuitry for direction of arrival estimation using microphone array with a sharp null 有权
    使用具有尖锐零点的麦克风阵列的到达方向估计方法和电路

    公开(公告)号：US09479867B2

    公开(公告)日：2016-10-25

    申请号：US14323560

    申请日：2014-07-03

    Applicant: Texas Instruments Incorporated

    Inventor： Yunhong Li

    IPC: H04R3/00 ,  H04R1/40

    CPC classification number: H04R3/005 ,  H04R1/406

    Abstract: A device is configured for identifying a direction of a sound. The device includes a controller comprising circuitry. The circuitry is configured to receive a first output from a first input device and a second output from a second input device. The circuitry is also configured to add a delay to the second output. The circuitry is also configured to compare the first output to the delayed second output in a plurality of directions to form a comparison. The circuitry is also configured to identify a number of null directions of the plurality of directions where a set of nulls exists based on the comparison.

    Abstract translation: 设备被配置为识别声音的方向。 该装置包括一个包括电路的控制器。 电路被配置为从第一输入设备接收第一输出和从第二输入设备接收第二输出。 电路还被配置为向第二输出添加延迟。 电路还被配置为在多个方向上比较第一输出与延迟的第二输出以形成比较。 电路还被配置为基于比较来识别存在一组空值的多个方向的空值方向的数量。

    Method and system for active noise cancellation
    3.
    发明授权
    Method and system for active noise cancellation 有权
    主动噪声消除的方法和系统

    公开(公告)号：US09257113B2

    公开(公告)日：2016-02-09

    申请号：US14010667

    申请日：2013-08-27

    Applicant: Texas Instruments Incorporated

    Inventor： Chuan Ni ,  Yunhong Li ,  Long Yin Chen

    IPC: G01K11/00 ,  G10K11/178

    CPC classification number: G10K11/1786 ,  G10K11/17857 ,  G10K11/17885 ,  G10K2210/108 ,  G10K2210/111 ,  G10K2210/3046

    Abstract: From at least a first microphone, first microphone signals are received that represent first sound waves. From at least a second microphone, second microphone signals are received that represent second sound waves. In response to the first microphone signals, first noise in the first sound waves is estimated, and first cancellation signals are output for causing a speaker array to generate first additional sound waves via at least a first acoustic beam for cancelling at least some of the first noise. In response to the second microphone signals, second noise in the second sound waves is estimated, and second cancellation signals are output for causing the speaker array to generate second additional sound waves via at least a second acoustic beam for cancelling at least some of the second noise.

    Abstract translation: 从至少第一麦克风接收表示第一声波的第一麦克风信号。 从至少第二麦克风接收代表第二声波的第二麦克风信号。 响应于第一麦克风信号，估计第一声波中的第一噪声，并且输出第一抵消信号，以使扬声器阵列经由至少第一声束产生第一附加声波，以抵消第一声波中的至少一些 噪声。 响应于第二麦克风信号，估计第二声波中的第二噪声，并且输出第二抵消信号，以使扬声器阵列经由至少第二声束产生第二附加声波，以抵消第二声波中的至少一些第二声波 噪声。

    Ultrasonic lens cleaning system with current sensing
    5.
    发明授权
    Ultrasonic lens cleaning system with current sensing 有权

    公开(公告)号：US10401618B2

    公开(公告)日：2019-09-03

    申请号：US15059529

    申请日：2016-03-03

    Applicant: Texas Instruments Incorporated

    Inventor： Yunhong Li ,  Nabeel Fuad Khan

    IPC: G02B27/00 ,  B08B7/02 ,  B60S1/56 ,  H04N5/217

    Abstract: Disclosed examples include ultrasonic cleaning systems, driver integrated circuits and methods for cleaning a lens, in which an oscillating drive signal is provided to an ultrasonic transducer and the driver controls the frequency of the drive signal according to a current sense signal representing a drive current flowing in the transducer. The driver sweeps the drive signal frequency and compares the sensed current values with predetermined profiles corresponding to a clean lens and a lens with one or more known contaminants, and generates the drive signal at one or more frequencies corresponding to peaks or valleys of the sensed current values or predetermined frequencies to promote cleaning of the lens.

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