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Frame loss management in an FD/LPD transition context

  • US 10,600,424 B2
  • Filed: 07/27/2015
  • Issued: 03/24/2020
  • Est. Priority Date: 07/29/2014
  • Status: Active Grant
First Claim
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1. A method for decoding a digital audio signal encoded using predictive coding and transform coding, wherein the method comprises the following operations:

  • predictive decoding of a preceding frame of the digital audio signal, encoded by a set of predictive coding parameters; and

    upon detecting the loss of a current frame of the encoded digital audio signal, before receiving a next frame following the current frame, and thus regardless of whether the next frame is encoded using predictive coding or encoded using transform coding or is a transition frame;

    generating, by prediction, from at least one predictive coding parameter encoding the preceding frame, a replacement frame for the current frame;

    generating, by prediction, from at least one predictive coding parameter encoding the preceding frame, an additional segment of digital audio signal; and

    temporarily storing said additional segment of digital audio signal; and

    upon receiving of the next frame, the method further comprises decoding said next frame using said additional segment of digital audio signal,wherein the next frame of encoded digital audio signal comprises at least one segment encoded by transform and decoding the next frame comprises a sub-step of overlap-adding the additional segment of digital audio signal and said segment encoded by transform by applying the following formula;

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