公开(公告)号：US20190235829A1

公开(公告)日：2019-08-01

申请号：US16378466

申请日：2019-04-08

Applicant: EVA Automation, Inc.

Inventor： Leo Lay ,  Adrian Harold Chadd ,  Haisong Wang ,  Shiwei Zhao ,  Li Li ,  Gaylond Yu

IPC: G06F3/16 ,  H04R3/12 ,  H04L29/06 ,  H04H60/80 ,  H04R27/00 ,  H04L7/033 ,  H04L7/00 ,  H04M1/725 ,  H04N21/233 ,  H04N21/43 ,  H04N21/81

CPC classification number: G06F3/165 ,  H04H60/80 ,  H04J3/0632 ,  H04J3/0661 ,  H04L7/0012 ,  H04L7/0016 ,  H04L7/033 ,  H04L7/0331 ,  H04L65/4069 ,  H04L65/60 ,  H04L65/608 ,  H04L65/80 ,  H04M1/72558 ,  H04N21/233 ,  H04N21/4305 ,  H04N21/8113 ,  H04R3/12 ,  H04R27/00 ,  H04R2227/005 ,  H04R2420/07

Abstract: An electronic device that coordinates a playback operation is described. In particular, an interface circuit in the electronic device may calculate, based on differences between transmit times when packets were transmitted by a second electronic device and receive times of the packets, relative drift as a function of time between a clock in the interface circuit and a second clock in the second electronic device. Then, the interface circuit may adjust, based on the relative drift, a clock circuit that provides the clock to eliminate the relative drift, and may determine a remaining time offset between the clock and the second clock. Next, the interface circuit may modify a future time when the second electronic device is to perform the playback operation based on the remaining time offset to determine a corrected future time, and may transmit information to the second electronic device specifying the corrected future time.