公开(公告)号：US20200209984A1

公开(公告)日：2020-07-02

申请号：US16235335

申请日：2018-12-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： TING LI ,  RAHMI HEZAR ,  SRINATH MATHUR RAMASWAMY ,  ANAND DABAK ,  BAHER HAROUN

IPC: G06F3/03 ,  G01S17/48 ,  G01S7/486 ,  G06F3/042 ,  G06F3/038 ,  G06F3/041 ,  G06F3/0346

Abstract: An optical position sensing system is disclosed. The system includes a substrate having a surface. A plurality of photodetectors are at multiple locations across the surface, each of the plurality of photodetectors providing detector pulse signals in response to receiving the light. The system further includes a processor that determines a phase shift between the transmitted light pulse signals and the respective detector pulse signals and applies a multi-path resolution operation to distinguish between the detector pulse signals representing the transmitted light pulse signals and those representing reflected light pulse signals. The processor also calculates a distance of a transmitting device from each of the photodetectors based on the determined phase shift and the multi-path resolution operation and calculates a multi-dimensional position of the transmitting device relative to the substrate based on the calculated distances.

公开(公告)号：US20200275206A1

公开(公告)日：2020-08-27

申请号：US15930957

申请日：2020-05-13

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： RAHMI HEZAR ,  RAJAN NARASIMHA ,  SRINATH RAMASWAMY

IPC: H04R3/04 ,  H03F3/217 ,  H03F1/32 ,  H03F3/187

Abstract: A system for driving an audio speaker that has an impedance, the system comprising: a scaler having an analog input and a scaler output that is an attenuated analog input; an amplifier having an amplifier input coupled to the scaler output and an amplifier output; a current sensor having a sensor input coupled to the speaker and a sensor output, the current sensor configured to generate a sensor signal at the sensor output responsive to a current from the audio speaker; and a compensator circuit having a circuit input coupled to the sensor output and a circuit output coupled to the amplifier input, the compensator circuit configured to supply a compensation signal to the amplifier input by applying a transfer function to the sensor signal.

公开(公告)号：US20180324524A1

公开(公告)日：2018-11-08

申请号：US15584532

申请日：2017-05-02

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： RAHMI HEZAR ,  RAJAN NARASIMHA ,  SRINATH RAMASWAMY

IPC: H04R3/04 ,  H03F3/217 ,  G01R19/00

Abstract: One example includes a system that is comprised of a speaker, an amplifier, a current sensor, and a compensator circuit. The speaker produces audio in response to an amplified analog input signal received at a speaker input. The amplifier receives an analog audio input signal and provides the amplified analog audio input signal to the speaker input. The current sensor senses current passing through the speaker and provides a current sensor signal indicative thereof. The compensator circuit applies a transfer function to the current sensor signal to provide a compensation signal as feedback into the analog audio input signal, the transfer function matching at least one of resistance and inductance of the speaker.