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Method and apparatus for selective signal coding based on core encoder performance

  • US 8,639,519 B2
  • Filed: 04/09/2008
  • Issued: 01/28/2014
  • Est. Priority Date: 04/09/2008
  • Status: Active Grant
First Claim
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1. A method for coding an input audio signal, the method comprising:

  • encoding the input signal using a core layer encoder to produce a core layer encoded signal;

    decoding the core layer encoded signal to produce a reconstructed signal;

    comparing the reconstructed signal to the input signal, wherein the comparing comprises estimating an energy E_err of the reconstructed signal that contain errors, determining a ratio S(k)/Sc(k) of component S(k) of the input signal to the component Sc(k) of the reconstructed signal exceeds a threshold value and summing the energies of those components Sc(k) of the reconstructed signal when the ratio S(k)/Sc(k) does not exceed the threshold value;

    selecting an enhancement layer encoder from a plurality of enhancement layer encoders dependent upon the comparison between the reconstructed signal and the input signal; and

    generating an enhancement layer encoded signal using the selected enhancement layer encoder, the enhancement layer encoded signal being dependent upon the input signal.

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