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Low bit rate audio-visual communication system having integrated perceptual speech and video coding

  • US 5,550,580 A
  • Filed: 05/31/1995
  • Issued: 08/27/1996
  • Est. Priority Date: 04/06/1994
  • Status: Expired due to Fees
First Claim
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1. A method of selecting an audio encoding technique for encoding an audio signal by an audio-visual communication system that contains audio and video information, said video information including a view of a facial region of at least one person, said facial region including lips, said method comprising the steps of:

  • analyzing said audio signal to determine if there is audio activity;

    analyzing said video signal to determine if said lips of said person in said view are moving; and

    encoding said audio signal with a speech specific audio encoding technique if said analyzing steps determine that said lips are moving while there is audio activity and encoding said audio signal with a non-speech specific audio encoding technique if said analyzing steps determine that said lips are not moving while there is audio activity.

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