Texas Instruments Corporation

Tempo Semiconductor, Inc.

Shun Qian

Kim Nordtorp Madsen

Lucia Wan

Daniel Bogard

Qichang Wu

Shizhou Liu

Dafydd H Roche

Jin Ruan

The disclosed embodiments include an audio amplifier system configured to provide a total harmonic distortion (THD) controlled clip detector and an automatic gain limiter (AGL) solution for a closed-loop amplifier. The audio amplifier system is capable of maintaining high power output without hard distortion (i.e., hard clipping) for providing better acoustics, while preventing damage to the system.

Total harmonic distortion (THD) controlled clip detector and automatic gain limiter (AGL)

A circuit includes an input channel array that includes a plurality of channels to receive a plurality of input signals and generate a plurality of channel output signals. A processor to processes the plurality of channel output signals from the input channel array. The processor and the input channel array are configured to operate in a sleep mode when all of the analog input signals are inactive or an active mode when at least one of the analog input signals is active. A secondary channel samples the plurality of input signals and generates a secondary output signal indicative of activity for at least one of the input signals. A secondary channel detector determines a level of signal activity for any of the input signals during the sleep mode based on the secondary output signal.

Power control for multichannel signal processing circuit

An audio processing integrated circuit chip, such as codec chip, includes at least one port output circuit configured to generate an audio signal to drive an external audio device and a PC beep circuit configured to receive a PC beep signal and to apply the received PC beep signal to an input of the at least one port output circuit. The chip further includes a control circuit configured to detect activity of the PC beep signal and to enable and/or disable the at least one port output circuit responsive to the detected activity.

Audio processing devices with port output circuits controlled by PC beep signal activity

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Shun Qian