公开(公告)号：US20140112491A1

公开(公告)日：2014-04-24

申请号：US13655060

申请日：2012-10-18

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Nitish Krishna Murthy ,  Supriyo Palit ,  Edwin Randolph Cole ,  Jorge Francisco Arbona Miskimen

IPC: G10K11/16

CPC classification number: G10K11/178 ,  G10K11/1785 ,  G10K11/17885 ,  G10K2210/1081 ,  G10K2210/3028 ,  G10K2210/3033 ,  G10K2210/3214

Abstract: A method and apparatus for active noise canceling. The method includes retrieving an input sample from at least one of a feedback or feedforward microphone digitized through the sigma-delta converter, retrieving the input sample and a related filter, wherein the filter is customized to the particular headset, outputting a filtered signal through a speaker without any interpolation and reducing order of CIC filters, and outputting a response sharply tapered down.

Abstract translation: 一种主动噪声消除的方法和装置。 该方法包括从通过Σ-Δ转换器数字化的反馈或前馈麦克风中的至少一个麦克风检索输入样本，检索输入样本和相关滤波器，其中滤波器被定制到特定耳机，通过一个滤波器输​​出滤波信号 扬声器没有任何内插和减少CIC滤波器的顺序，并且输出响应急剧下降。

公开(公告)号：US11503404B1

公开(公告)日：2022-11-15

申请号：US17362650

申请日：2021-06-29

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： David Hernandez ,  Supriyo Palit

IPC: H04R3/00 ,  H03F3/183

Abstract: A system includes a feedforward path coupled to a signal input. The system also includes a speaker coupled to the feedforward path. The system includes a back electromotive force (BEMF) extractor coupled to the speaker, where the BEMF extractor has a first input, a second input, and an output. The BEMF extractor includes a first summing point coupled to the first input. The BEMF extractor includes a resistor amplifier coupled to the second input and the first summing point. The BEMF extractor includes a high pass filter coupled to the second input and to an inductor amplifier. The BEMF extractor also includes a low pass filter coupled to the first summing point. The BEMF extractor includes a second summing point coupled to the low pass filter, the inductor amplifier, and the output.

公开(公告)号：US11374522B2

公开(公告)日：2022-06-28

申请号：US16906364

申请日：2020-06-19

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： David Hernandez ,  Supriyo Palit

IPC: H02P25/034 ,  G05B19/4155 ,  H02P23/00

Abstract: Disclosed embodiments include an apparatus for closed loop control of a linear resonant actuator comprising a motor drive circuit configured to provide a motor drive signal, a current and voltage sensing circuit coupled to the output terminal of the motor drive circuit and across the motor, and having current sense and a voltage sense outputs. A resonant frequency and back emf extraction circuit receives the current sense and voltage sense outputs, and outputs a resonant frequency signal output and a measured back emf signal output. An actuator model circuit has inputs coupled to the output of the motor drive circuit, the resonant frequency signal output, and a mechanical system quality factor signal generated by an adaptation circuit having an input coupled to the error summing circuit output. The error summing circuit has inputs coupled to the output of the actuator model and the measured back emf signal.

公开(公告)号：US11121662B2

公开(公告)日：2021-09-14

申请号：US16856490

申请日：2020-04-23

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Supriyo Palit ,  David Hernandez

IPC: H02P25/06

Abstract: Disclosed embodiments include a method for closed loop phase tracking comprised of determining a first estimated resonant frequency, generating a motor drive signal at the first estimated resonant frequency and applying the motor drive signal to a motor, measuring current and voltage of the motor drive signal, and filtering the measurements of current and voltage of the motor drive signal. The phase difference between the filtered current and voltage waveforms is measured and a second estimated resonant frequency is calculated. The generated motor drive frequency is adjusted to equal the second estimated resonant frequency.

公开(公告)号：US10250978B1

公开(公告)日：2019-04-02

申请号：US16042034

申请日：2018-07-23

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Supriyo Palit

IPC: H04R3/00 ,  H04R3/04 ,  H03G3/30 ,  H03F1/30 ,  H03F3/183 ,  H03G3/00

Abstract: A system includes a gain control circuit configured to dynamically select a gain value based on an estimated temperature for a speaker voice coil, a base gain value, and a threshold temperature value. The system also includes a power control circuit configured to determine a power limit value based on the gain value. The system also includes a filter circuit configured to adjust values of a digitized audio signal based on the power limit value. The system also includes a digital-to-analog converter (DAC) coupled to the filter circuit and configured to convert a digital output of the filter circuit to an analog audio signal.