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Energy envelope perceptual correction for high band coding

  • US 8,560,330 B2
  • Filed: 07/19/2011
  • Issued: 10/15/2013
  • Est. Priority Date: 07/19/2010
  • Status: Active Grant
First Claim
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1. A method of encoding an audio bitstream at an encoder, the method comprising:

  • encoding an original low band signal at the encoder by using a closed loop analysis-by-synthesis approach to obtain a coded low band signal;

    encoding an original high band signal at the encoder by using an open loop energy matching approach to obtain coded high band energy envelopes;

    comparing an energy of the coded low band signal with an energy of a corresponding original low band signal for a subframe;

    generating an indication flag that indicates whether an energy envelope perceptual correction is needed for the subframe based on comparing the energy; and

    electronically transmitting the coded low band signal, the coded high band energy envelopes, and the indication flag.

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