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Efficiency improvements in scalable audio coding

  • US 7,277,849 B2
  • Filed: 03/12/2003
  • Issued: 10/02/2007
  • Est. Priority Date: 03/12/2002
  • Status: Active Grant
First Claim
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1. An audio encoding method of coding audio signals 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 comprisingforming 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, andproducing said second layer signal by encoding said selected signal.

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