| 摘要 |
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 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. |
| 主权项 |
1. A first playback device comprising:
one or more processors tangible, non-transitory computer-readable memory comprising program instructions that, when executed by the one or more processors, causes the first playback device to:
receive, from a network device,
(i) a stream of first audio content over a direct communication link and(ii) a first set of one or more commands;in response to receiving the first set of one or more commands, play the first audio content;receive, from the network device over a local area network (LAN), a second set of one or more commands to play second audio content in synchrony with a second playback device, wherein the second audio content is stored at a network location separate from the network device; andin response to receiving the second set of one or more commands,
(i) obtain the second audio content,(ii) transmit the second audio content, playback timing information for the second audio content, and first playback device clock information to the second playback device over the LAN, and(iii) play the second audio content in synchrony with the second playback device according to the playback timing information for the second audio content and the first playback device clock information, wherein the first and second playback devices remain independently clocked while playing the second audio content in synchrony. |
