公开(公告)号：US10477333B1

公开(公告)日：2019-11-12

申请号：US15363812

申请日：2016-11-29

Applicant: Amazon Technologies, Inc.

Inventor： Michael Alan Pogue ,  Hanoch Freund

IPC: H04R29/00 ,  H04R27/00 ,  H04R3/12

Abstract: A system capable of synchronizing audio by determining a playback delay between when an audio sample is sent to and then output from a speaker. The system may generate a test signal configured to reach a saturation threshold and may send the test signal at a first time, followed by blank audio samples, from a first processor to a second processor to be output by the speaker. The second processor may detect that an audio sample exceeds a saturation threshold at a second time, generate a timestamp and send the timestamp to the first processor. The first processor may determine a playback delay between the first time and the second time and may also determine a number of blank audio samples sent between the first time and the second time. Using the playback delay and the number of blank audio samples, the system may generate audio using precise timing.