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Audio signal decoder and method for producing a scaled reconstructed audio signal

  • US 8,200,496 B2
  • Filed: 12/29/2008
  • Issued: 06/12/2012
  • Est. Priority Date: 12/29/2008
  • Status: Active Grant
First Claim
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1. An apparatus that decodes an audio signal, comprising:

  • a gain vector decoder of an enhancement layer decoder that receives a reconstructed audio vector Ŝ and

    an index representative of a gain vector,wherein a gain selector of the gain vector decoder receives the index representative of the gain vector;

    a gain selector of the gain vector decoder that detects a set of peaks in the reconstructed audio vector, generates a scaling mask ψ



    ) based on the detected set of peaks, and generates the gain vector g* based on at least the scaling mask and the index representative of the gain vector;

    a scaling unit of the gain vector decoder that scales the reconstructed audio vector with the gain vector to produce a scaled reconstructed audio signal.

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