公开(公告)号：US10461712B1

公开(公告)日：2019-10-29

申请号：US15714717

申请日：2017-09-25

Applicant: Amazon Technologies, Inc.

Inventor： Jun Yang ,  Craig McFarland ,  Yingbin Liu

IPC: H03G3/00 ,  H03G3/30 ,  G06F3/16 ,  G10L25/21 ,  H03G5/16

Abstract: Devices and techniques are generally described for automatic volume leveling of an audio signal. An audio signal may be received and a first portion of the audio signal may be stored in a buffer. A root mean square (RMS) estimate of a level of the first portion of the audio signal may be determined based at least in part on a second portion of the audio signal previous to the first portion. A modified audio signal may be generated by multiplying the first portion of the audio signal in the buffer by a variable gain. The variable gain may be based at least in part on the RMS estimate. The modified audio signal may be sent to a loudspeaker.

公开(公告)号：US10080088B1

公开(公告)日：2018-09-18

申请号：US15348389

申请日：2016-11-10

Applicant: Amazon Technologies, Inc.

Inventor： Jun Yang ,  Haoliang Dong ,  Yingbin Liu

IPC: H04R27/00 ,  H04R3/04

CPC classification number: H04S7/30

Abstract: A system capable of directing audio output to a portion of a shared acoustic environment. For example, the system may divide the environment into two or more sound zones and may generate audio output directed to one or more sound zones. The system may distinguish between target sound zones and quiet sound zones and may determine a set of global filter coefficients with which to direct the audio output. The system may generate a first set of filter coefficients that increase audio volume in the target sound zones and a second set of filter coefficients that increase a ratio of audio volume between the target sound zones and the quiet sound zones. The system may generate the set of global filter coefficients using a combination of the first set and the second set. The system may also direct audio from multiple audio sources in different directions.