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SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR NOISE INJECTION

  • US 20120046955A1
  • Filed: 08/16/2011
  • Published: 02/23/2012
  • Est. Priority Date: 08/17/2010
  • Status: Active Grant
First Claim
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1. A method of processing an audio signal, said method comprising:

  • based on information from the audio signal, selecting one among a plurality of entries of a codebook;

    determining locations, in a frequency domain, of zero-valued elements of a first signal that is based on the selected codebook entry;

    calculating energy of the audio signal at the determined frequency-domain locations;

    calculating a value of a measure of a distribution of the energy of the audio signal among the determined frequency-domain locations; and

    based on said calculated energy and said calculated value, calculating a noise injection gain factor.

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