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Synchronization of audio and video signals from remote sources over the internet

  • US 20100198992A1
  • Filed: 04/08/2010
  • Published: 08/05/2010
  • Est. Priority Date: 02/22/2008
  • Status: Active Grant
First Claim
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1. A means for providing synchronous delivery and playback of three or more electronic audio or video files from multiple clients, having differing arrival latencies, from clients from multiple locations communicating through the internet, during an on-line session, the synchronous delivery and playback means comprising:

  • a. a session server having a list of Network Time Protocol (NTP) servers, the list is passed to each client through the internet so that each client can acquire its own time reference;

    b. a client application, said client application connecting each client to each other and to the session server, each client utilizing a formalized Internet time standard, said Internet time standard being the NTP, each client having an NTP clock which is shared with all clients;

    c. a timing mechanism, said timing mechanism adjusting each client'"'"'s NTP timestamp in the client application of all clients; and

    d. a file calibrating mechanism in each client application, said file calibrating mechanism having a buffer, a mixer, and a n offset NTP timestamp, said buffer having a means for analyzing the difference in arrival latencies of streams by all clients, and a means for synchronizing the streams, by which the arrival latency of any client'"'"'s stream may be increased so that all streams by all clients arrive at the same time, and said mixer returns each stream to all clients, and said adjusted timestamp from all clients being the timing means of each stream.

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