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Multimedia communications with system-dependent adaptive delays

  • US 5,570,372 A
  • Filed: 11/08/1995
  • Issued: 10/29/1996
  • Est. Priority Date: 11/08/1995
  • Status: Expired due to Term
First Claim
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1. A method of synchronizing video data and audio data within intersystem communications comprising steps of:

  • forming separate video and audio signals at an originating system;

    processing a video signal along a video path of said originating system and processing an audio signal along an audio path of said originating system for transmission of video and audio data to a remote site, wherein processing said video and audio signals introduces dissimilar delays to said video and audio data;

    forming delay data that are indicative of dissimilarity of said delays to said video and audio data;

    transmitting said video, audio and delay data to a receiving system that is remote from said originating system;

    processing said video and audio data along video and audio paths of said receiving system, wherein said video and audio paths of said receiving system introduce dissimilar delays; and

    adaptively introducing a compensation delay to one of said video and audio data at said receiving system in response to said delay data from said originating system and to dissimilarity of said delays at said receiving system, including selecting said compensation delay to at least partially offset a difference between audio data delay and video data delay introduced via a combination of said originating and receiving systems.

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