08234395 is referenced by 404 patents and cites 77 patents.

A system maintains synchrony of operations among devices that have independent clocking arrangements. The system includes a task distribution device that distributes tasks to a synchrony group of devices that perform the tasks distributed by the task distribution device in synchrony. The task distribution device distributes each task to the members of the synchrony group over a network. Each task is associated with a time stamp that indicates a time, relative to a clock maintained by the task distribution device, at which the members of the synchrony group are to execute the task. Each member of the synchrony group periodically obtains an indication of the current time indicated by its clock, determines a time differential between the task distribution device's clock and its respective clock and determines a time at which, according to its respective clock, the time stamp indicates that it is to execute the task.

Title
System and method for synchronizing operations among a plurality of independently clocked digital data processing devices
Application Number
10/816217
Publication Number
8234395 (B2)
Application Date
April 1, 2004
Publication Date
July 31, 2012
Inventor
Nicholas A J Millington
Santa Barbara
CA, US
Agent
Hanley Flight & Zimmerman
Assignee
Sonos
CA, US
IPC
G06F 15/16
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