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SYSTEMS, METHODS, AND APPARATUS FOR SYNCHRONIZATION OF AUDIO AND VIDEO SIGNALS

  • US 20070276670A1
  • Filed: 05/25/2007
  • Published: 11/29/2007
  • Est. Priority Date: 05/26/2006
  • Status: Active Grant
First Claim
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1. A method of processing an audiovisual signal that has (A) a video portion including a series of video synchronization references and (B) an audio portion, said method comprising:

  • detecting a video synchronization event within the series of video synchronization references;

    detecting an audio synchronization event in the audio portion; and

    according to a time relation between the video and audio synchronization events, performing one among advancing and delaying one of the video and audio portions with respect to the other of the video and audio portions,wherein each video synchronization reference in the series includes a first region and a second region, andwherein, from the first to the last of the series of video synchronization references over time, a spatial frequency of the first region increases and a spatial frequency of the second region decreases, andwherein the video synchronization event is a coincidence of the spatial frequency of the first region and the spatial frequency of the second region.

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