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Adaptive Transition Frequency Between Noise Fill and Bandwidth Extension

  • US 20160086614A1
  • Filed: 12/01/2015
  • Published: 03/24/2016
  • Est. Priority Date: 08/27/2007
  • Status: Active Grant
First Claim
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1. A method for spectrum recovery for spectral decoding of an audio signal, comprising the steps of:

  • obtaining an initial set of spectral coefficients representing said audio signal;

    dividing said spectral coefficients of said initial set of spectral coefficients into a plurality of frequency bands;

    determining a transition frequency;

    noise filling of spectral holes in said initial set of spectral coefficients below said transition frequency; and

    bandwidth extending said initial set of spectral coefficients above said transition frequency;

    whereinsaid transition frequency is set at the upper limit of the first frequency band seen from the high-frequency side that has a quantized coefficient in it.

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