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Adaptive transition frequency between noise fill and bandwidth extension

  • US 10,199,049 B2
  • Filed: 06/30/2017
  • Issued: 02/05/2019
  • Est. Priority Date: 08/27/2007
  • Status: Active Grant
First Claim
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1. A method for processing an audio signal, comprising:

  • dividing spectral coefficients of an initial set of spectral coefficients representing at least a portion of said audio signal into a plurality of frequency bands, each of the plurality of frequency bands comprising a plurality of frequencies between an upper frequency of the frequency band and a lower frequency of the frequency band; and

    after dividing spectral coefficients into the plurality of frequency bands, determining a first transition frequency for the initial set of spectral coefficients based on a distribution of spectral holes in the initial set of spectral coefficients, whereinsaid first transition frequency defines a border between a first frequency range intended to be a subject for noise filling of spectral holes and a second frequency range intended to be a subject for bandwidth extension, anddetermining the first transition frequency based on the distribution of spectral holes in the initial set of spectral coefficients comprises choosing the first transition frequency based on the distribution of spectral holes in the initial set of spectral coefficients such that;

         1) at least one frequency band that comprises a frequency that is less than said first transition frequency includes at least one quantized coefficient and

         2) each of said frequency bands that comprises a frequency that is greater than said first transition frequency does not include any quantized coefficients.

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