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Bitstream syntax for multi-process audio decoding

  • US 9,741,354 B2
  • Filed: 04/29/2016
  • Issued: 08/22/2017
  • Est. Priority Date: 06/29/2007
  • Status: Active Grant
First Claim
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1. A method of decoding a compressed audio bitstream containing syntax elements conforming to a bitstream syntax to produce at least one audio signal, the bitstream syntax defining a base coding layer and a frequency extension coding layer that codes a portion of audio content using a frequency extension coding, the method comprising:

  • with a processor;

    reading the frequency extension coding layer of the compressed audio bitstream;

    parsing a plurality of syntax elements from the frequency extension coding layer specifying parameters used in the frequency extension coding, the parameters associated with different frequency sub-bands and including a number of sub-bands and at least one starting point associated with a change in a coding transform between frequency bands wherein the at least one starting point is identified based on an energy difference between the compressed audio bitstream and an original audio signal in a selected frequency band;

    reconstructing the portion of the audio content;

    by processing the coded audio content based on the starting point, wherein the processing includes changing a coding transform at the starting point so as to produce a corresponding audio signal; and

    outputting the audio signal.

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