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Post-quantization gain correction in audio coding

  • US 10,460,739 B2
  • Filed: 08/04/2017
  • Issued: 10/29/2019
  • Est. Priority Date: 03/04/2011
  • Status: Active Grant
First Claim
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1. A gain adjustment method, performed by a gain adjustment apparatus, in decoding an audio signal that has been encoded with separate gain and shape representations, said method comprising:

  • estimating an accuracy measure of the shape representation for a frequency band of the audio signal, wherein the shape representation encodes a shape vector comprising coefficients of the audio signal for the frequency band, and wherein the shape vector has been encoded using a pulse vector coding scheme where pulses may be added on top of each other to form pulses of different height, and the accuracy measure is based on the number of pulses used for encoding the shape vector and a height of the maximum pulse in the shape representation;

    determining, based on the estimated accuracy measure, a gain correction; and

    adjusting the gain representation for the frequency band based on the determined gain correction.

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