(19)
(11)EP 3 623 935 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
29.04.2020 Bulletin 2020/18

(43)Date of publication A2:
18.03.2020 Bulletin 2020/12

(21)Application number: 19194999.9

(22)Date of filing:  02.07.2004
(51)International Patent Classification (IPC): 
G06F 3/16(2006.01)
G06F 9/48(2006.01)
H04J 3/06(2006.01)
H04L 29/06(2006.01)
G06F 15/16(2006.01)
H04R 27/00(2006.01)
G11B 20/10(2006.01)
H04N 21/43(2011.01)
(84)Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

(30)Priority: 28.07.2003 US 49076803 P
01.04.2004 US 81621704

(62)Application number of the earlier application in accordance with Art. 76 EPC:
13184747.7 / 2713281
13155130.1 / 2648111
04778540.7 / 1654614

(71)Applicant: Sonos, Inc.
Santa Barbara, CA 93101 (US)

(72)Inventor:
  • MILLINGTON, Nicholas A.J.
    Santa Barbara, CA 93101 (US)

(74)Representative: EIP 
EIP Europe LLP Fairfax House 15 Fulwood Place
London WC1V 6HU
London WC1V 6HU (GB)

  


(54)SYSTEM AND METHOD FOR SYNCHRONIZING OPERATIONS AMONG A PLURALITY OF INDEPENDENTLY CLOCKED DIGITAL DATA PROCESSING DEVICES


(57) A system is described for maintaining synchrony of operations among a plurality of devices that have independent clocking arrangements. The system includes a task distribution device that distributes tasks to a synchrony group comprising a plurality of devices that are to 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 o the task. Each member of the synchrony group periodically obtains from the task distribution device 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 therefrom a time at which, according to its respective clock, the time stamp indicates that it is to execute the task.







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