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Clock synchronization for audio playback devices

  • US 9,798,515 B1
  • Filed: 03/31/2016
  • Issued: 10/24/2017
  • Est. Priority Date: 03/31/2016
  • Status: Active Grant
First Claim
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1. A method for synchronizing clocks on a plurality of audio playback devices, the method comprising:

  • receiving a broadcast/multicast acknowledgement packet from a synchronization agent at a first audio playback device of the plurality of audio playback devices;

    receiving the broadcast/multicast acknowledgement packet at a time server;

    recording a first timestamp representing a time when the acknowledgement packet was received by the first audio playback device;

    receiving a broadcast/multicast timestamp packet from the time server at the first audio playback device, wherein the timestamp packet includes a second timestamp representing a time when the time server received the acknowledgement packet from the synchronization agent; and

    updating a local clock time on the first audio playback device based on the first timestamp and the second timestamp,wherein the method enables clock synchronization among the plurality of audio playback devices for synchronized playback of audio content via the plurality of audio playback devices, andwherein the synchronization agent and the time server are separate and discrete devices that are configured to communicate over a local area network.

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