公开(公告)号：US20230336136A1

公开(公告)日：2023-10-19

申请号：US17719613

申请日：2022-04-13

Applicant: STMicroelectronics S.r.l.

Inventor： Francesco STILGENBAUER ,  Paolo CACCIAGRANO ,  Giovanni GONANO

IPC: H03G3/34 ,  H04R3/00

CPC classification number: H03G3/344 ,  H04R3/00 ,  H04R2430/01 ,  H03G2201/103

Abstract: A digital audio playback circuit includes a noise shaping circuit configured to receive an input digital audio signal, and a digital to analog converter (DAC) configured to convert the input digital audio signal to a pre-amplified output analog audio signal according to a gain ramp defined by a gain control signal. A muting circuit is configured to compare input digital audio signal to a threshold and assert a mute control signal when the input digital audio signal is below the threshold. An analog gain control ramp circuit is configured to generate the gain control signal in response to the mute control signal to cause the gain ramp to ramp down. An amplifier is configured to amplify the pre-amplified output analog audio signal for playback by an audio playback device.