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Comfort noise addition for modeling background noise at low bit-rates

  • US 10,147,432 B2
  • Filed: 06/19/2015
  • Issued: 12/04/2018
  • Est. Priority Date: 12/21/2012
  • Status: Active Grant
First Claim
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1. A decoder being configured for processing an encoded audio bitstream, wherein the decoder comprises:

  • a bitstream decoder configured to derive a decoded audio signal from the bitstream, wherein the decoded audio signal comprises at least one decoded frame;

    a noise estimation device configured to produce a noise estimation signal comprising an estimation of the level and/or the spectral shape of a noise in the decoded audio signal;

    a comfort noise generating device configured to derive a comfort noise signal from the noise estimation signal, wherein the comfort noise generating device is configured to create the comfort noise signal based on a target comfort noise level signal; and

    a combiner configured to combine the decoded frame of the decoded audio signal and the comfort noise signal in order to acquire an audio output signal, in such way that the decoded frame in the audio output signal comprises artificial noise.

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