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Audio packet loss concealment by transform interpolation

  • US 8,428,959 B2
  • Filed: 01/29/2010
  • Issued: 04/23/2013
  • Est. Priority Date: 01/29/2010
  • Status: Active Grant
First Claim
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1. An audio processing method, comprising:

  • receiving sets of packets at an audio processing device via a network, each set having one or more of the packets, each packet having transform coefficients in a frequency domain for reconstructing an audio signal in a time domain that has undergone transform coding;

    Determining one or more missing packets in a given one of the sets received, the one or more missing packets sequenced in the given set with a given sequence;

    applying a first weight to first transform coefficients of one or more first packets in a first set sequenced before the given set, the one or more first packets having a first sequence in the first set corresponding to the given sequence of the one or more missing packets in the given set;

    applying a second weight to second transform coefficients of one or more second packets in a second set sequenced after the given set, the one or more second packets having a second sequence in the second set corresponding to the given sequence of the one or more missing packets in the given set;

    interpolating transform coefficients by summing the corresponding first and second weighted transform coefficients;

    inserting the interpolated transform coefficients into the given set in place of the one or more corresponding missing packets; and

    producing an output audio signal for the audio processing device by performing an inverse transform on the transform coefficients.

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