公开(公告)号：US11361633B2

公开(公告)日：2022-06-14

申请号：US16895701

申请日：2020-06-08

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Kevin Selva Prasanna Valanarasu ,  Supriyo Palit

IPC: G08B6/00 ,  G06F3/16 ,  H04R3/04

Abstract: A method includes converting an audio signal of a current time period to a frequency domain to produce a set of frequency coefficients. For each of the frequency coefficients, the method includes computing a gradient of that frequency coefficient's magnitude relative to a magnitude of the same frequency coefficient from a previous time period. The method then includes summing the gradients computed for the set of frequency coefficients to produce a sum value, and then generating a haptic signal based on the sum value.

公开(公告)号：US10674263B1

公开(公告)日：2020-06-02

申请号：US16402509

申请日：2019-05-03

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Supriyo Palit ,  Abhishek Singh ,  Kevin Selva Prasanna Valanarasu

IPC: H04R3/00 ,  H03G3/30 ,  H03F3/181

Abstract: An audio circuit includes an amplifier, a voltage sensor, a current sensor, and an excursion control circuit. The voltage sensor is coupled to an output of the amplifier. The current sensor is coupled to the output of the amplifier. The excursion control circuit is coupled to the amplifier, the voltage sensor, and the current sensor. The excursion control circuit includes back electro-magnetic force (EMF) measurement, a back-EMF model, and excursion protection. The back-EMF measurement is to measure back electro-magnetic force of a speaker based on voltage measurements received from the voltage sensor and current measurements received from the current sensor. The back-EMF model is updated based on measurements of the back-EMF and is converted to an excursion model. The excursion protection is to limit amplitude of audio signal provided to the amplifier based on the excursion model of the speaker and amplitude of an audio input signal.