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Audio coding system using spectral hole filling

  • US 7,447,631 B2
  • Filed: 06/17/2002
  • Issued: 11/04/2008
  • Est. Priority Date: 06/17/2002
  • Status: Active Grant
First Claim
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1. A method for generating audio information, wherein the method comprises:

  • receiving an input signal and obtaining therefrom a set of subband signals each having one or more spectral components representing spectral content of an audio signal;

    identifying within the set of subband signals a particular subband signal in which one or more spectral components have a non-zero value and in which one or more of the spectral components have a zero value;

    deriving a scaling envelope from the one or more spectral components that have non-zero values, wherein the scaling envelope varies at a rate substantially equal to a rate of roll off of spectral leakage between adjacent subband signals of a synthesis filterbank;

    generating one or more synthesized spectral components that correspond to zero-valued spectral components in the particular subband signal and that are scaled according to the scaling envelope;

    generating a modified set of subband signals by substituting the synthesized spectral components for corresponding zero-valued spectral components in the particular subband signal; and

    generating the audio information by applying the synthesis filterbank to the modified set of subband signals.

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