Playback device

CAFC
  • US 10,209,953 B2
  • Filed: 08/31/2018
  • Issued: 02/19/2019
  • Est. Priority Date: 07/28/2003
  • Status: Active Grant
First Claim
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1. A method carried out by a first zone player, the method comprising:

  • receiving a request to enter into a synchrony group with at least a second zone player that is communicatively coupled with the first zone player over a local area network (LAN);

    in response to receiving the request to enter into the synchrony group, entering into the synchrony group with the second zone player, wherein the first zone player is selected to begin operating as a slave of the synchrony group and the second zone player is selected to begin operating as a master of the synchrony group, and wherein the first zone player operates in accordance with a clock time that differs from a clock time of the second zone player;

    after beginning to operate as the slave of the synchrony group;

    receiving, from the second zone player over the LAN, clock timing information that comprises at least one reading of the clock time of the second zone player;

    based on the received clock timing information, determining a differential between the clock time of the first zone player and the clock time of the second zone player;

    receiving, from the second zone player over the LAN, (a) audio information for at least a first audio track and (b) playback timing information associated with the audio information for the first audio track that comprises an indicator of a first future time, relative to the clock time of the second zone player, at which the first and second zone players are to initiate synchronous playback of the audio information for the first audio track;

    updating the first future time to account for the determined differential between the clock time of the first zone player and the clock time of the second zone player; and

    when the clock time of the first zone player reaches the updated first future time, initiating synchronous playback of the received audio information with the second zone player.

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