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Efficiency improvements in scalable audio coding

  • US 20030220783A1
  • Filed: 03/12/2003
  • Published: 11/27/2003
  • Est. Priority Date: 03/12/2002
  • Status: Active Grant
First Claim
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1. An audio encoding method of coding audio signal into a layered data stream having a first layer and a second layer, said second layer serving as an enhancement of said first layer, the method comprising the steps of forming an original digital audio signal;

  • encoding said original signal to obtain a first layer signal;

    producing a residual signal to reflect a difference between the original signal and the first layer signal;

    evaluating the residual signal; and

    , in case the result of the evaluation meets given criteria, selecting a predetermined low-entropy signal to be encoded as a second layer signal, and, otherwise, selecting either said original signal or said residual signal to be encoded as said second layer signal; and

    producing said second layer signal by encoding said selected signal.

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