公开(公告)号：US20220268838A1

公开(公告)日：2022-08-25

申请号：US17589779

申请日：2022-01-31

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Charles Kasimer SESTOK, IV ,  David Patrick MAGEE

IPC: G01R31/319 ,  G01R31/3167 ,  H03M1/10 ,  H03M1/06

Abstract: A circuit configured to: generate a reference clock signal; generate an excitation signal at a target frequency having a period that is a first integer number of cycles of the reference clock signal; update a driver circuit at an update frequency having a period that is a second integer number of cycles of the reference clock signal; digitize sense signals resulting from the excitation signal at a frequency having a period that is a third integer number of cycles of the reference clock signal; identify a fourth integer number of sense signal samples; optionally utilize an excitation control signal having a period that is a fifth integer number of cycles of the reference clock signal; and minimize harmonics at the target frequency of the excitation signal based on the first integer number, the second integer number, the third integer number, the fourth integer number, and possibly the fifth integer number.

公开(公告)号：US20220163590A1

公开(公告)日：2022-05-26

申请号：US17532970

申请日：2021-11-22

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Charles Kasimer SESTOK, IV ,  David Patrick MAGEE ,  Yevgen Pavlovich BARSUKOV

IPC: G01R31/367 ,  G01R31/3842 ,  G01R31/389

Abstract: A circuit for determining device under test (DUT) model parameters is described. The circuit includes a parameter estimator circuit configured to: obtain initial values for DUT model parameters based on sense signal samples; execute a parameter convergence model having a regularization parameter and a cost function that accounts for error residuals; and obtain final values for the DUT model parameters by adjusting the regularization parameter in iterations of the parameter convergence model as a function of cost function improvement until the parameter convergence model converges to within a target tolerance.

公开(公告)号：US20190325900A1

公开(公告)日：2019-10-24

申请号：US16460651

申请日：2019-07-02

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Ganesan THIAGARAJAN ,  Tarkesh PANDE ,  David Patrick MAGEE

IPC: G10L25/84 ,  G10L25/09 ,  G10L25/21

Abstract: In described examples, a method for detecting voice activity includes: receiving a first input signal containing noise; sampling the first input signal to form noise samples; determining a first value corresponding to the noise samples; subsequently receiving a second input signal; sampling the second input signal to form second signal samples; determining a second value corresponding to the second signal samples; forming a ratio of the second value to the first value; comparing the ratio to a predetermined threshold value; and responsive to the comparing, indicating whether voice activity is detected in the second input signal.