公开(公告)号：US11164592B1

公开(公告)日：2021-11-02

申请号：US16408267

申请日：2019-05-09

Applicant: Amazon Technologies, Inc.

Inventor： Biqing Wu ,  Phil Hetherington ,  Carlo Murgia ,  Rong Hu

IPC: G10L21/034 ,  G10L15/22 ,  G10L25/60 ,  G10L25/84

Abstract: A system that performs automatic gain control (AGC) using different decay rates. The system may select a slow decay rate to track a loudness level within speech (e.g., within an utterance), improving audio quality and maintaining dynamic range for an individual voice, while selecting a fast decay rate to track the loudness level after a gap of silence (e.g., no voice activity detected for a duration of time) or during large level changes (e.g., actual speech loudness is lower than estimated speech loudness for a duration of time). This improves an accuracy of the loudness estimate and therefore a responsiveness of the automatic gain control, resulting in an improved user experience.