公开(公告)号：US10123114B2

公开(公告)日：2018-11-06

申请号：US15643614

申请日：2017-07-07

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Uttam Kumar Agarwal ,  Prateek Jain ,  Nageswara Rao ,  Mukund Navada ,  Pradeep Chandar Chandramouli

IPC: H03G11/00 ,  H04R3/00 ,  H03F3/217 ,  H03F3/183 ,  H03G7/00 ,  H04R29/00 ,  H03G3/00 ,  H03G3/30

Abstract: Brownout management for an audio amplification system. An audio amplification system includes audio volume control circuitry, audio sample interpolation circuitry, and brownout management circuitry. The brownout management circuitry includes brownout detection circuitry and brownout response circuitry. The brownout detection circuitry is configured to determine whether a voltage of a battery that powers the audio amplification system is below a brownout threshold, and to generate a brownout detection signal that indicates the voltage is below the brownout threshold. The brownout response circuitry is coupled to an audio output of the audio sample interpolation circuitry. The brownout response circuitry is configured to attenuate the audio samples output by the audio sample interpolation circuitry responsive to the brownout detection signal indicating that the voltage is below the brownout threshold.

公开(公告)号：US10405092B2

公开(公告)日：2019-09-03

申请号：US16148349

申请日：2018-10-01

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Uttam Kumar Agarwal ,  Prateek Jain ,  Nageswara Rao ,  Mukund Navada ,  Pradeep Chandar Chandramouli

IPC: H03F3/217 ,  H04R29/00 ,  H04R3/00 ,  H03F3/183 ,  H03G7/00 ,  H03G3/00 ,  H03G3/30

Abstract: Brownout management for an audio amplification system. An audio amplification system includes audio volume control circuitry, audio sample interpolation circuitry, and brownout management circuitry. The brownout management circuitry includes brownout detection circuitry and brownout response circuitry. The brownout detection circuitry is configured to determine whether a voltage of a battery that powers the audio amplification system is below a brownout threshold, and to generate a brownout detection signal that indicates the voltage is below the brownout threshold. The brownout response circuitry is coupled to an audio output of the audio sample interpolation circuitry. The brownout response circuitry is configured to attenuate the audio samples output by the audio sample interpolation circuitry responsive to the brownout detection signal indicating that the voltage is below the brownout threshold.

公开(公告)号：US10763889B1

公开(公告)日：2020-09-01

申请号：US16661456

申请日：2019-10-23

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Uttam Kumar Agarwal ,  Anand Kannan ,  Ramamurthy Vishweshwara ,  Anand Subramanian ,  Pedro Ramon Gelabert ,  Diljith Mathal Thodi ,  Abhijit Anant Patki

IPC: H03M3/00 ,  H03G3/00 ,  H03G1/00 ,  H03G3/30 ,  H03M7/34 ,  H03M1/12 ,  H03M1/06 ,  H03G5/02

Abstract: A circuit includes a programmable gain amplifier (PGA) having a PGA output. The circuit further includes a delta-sigma modulator having an input coupled to the PGA output. The circuit also includes a digital filter and a dynamic range enhancer (DRE) circuit. The digital filter is coupled to the delta-sigma modulator output. The DRE circuit is coupled to the delta-sigma modulator output and to the PGA. The DRE circuit is configured to monitor a signal level of the delta-sigma modulator output. Responsive to the signal level being less than a DRE threshold, the DRE circuit is configured to program the PGA for a gain level greater than unity gain and to cause the digital filter to implement an attenuation of a same magnitude as the gain level to be programmed into the PGA.