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METHOD AND APPARATUS TO ENCODE/DECODE LOW BIT-RATE AUDIO SIGNAL

  • US 20070016411A1
  • Filed: 07/12/2006
  • Published: 01/18/2007
  • Est. Priority Date: 07/15/2005
  • Status: Active Grant
First Claim
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1. A method of encoding a low bit-rate audio signal, the method comprising:

  • quantizing and losslessly-encoding a specific frequency component of an audio signal in a frequency domain;

    generating codebooks using the audio signal in the frequency domain;

    detecting an envelope of a frequency component of the audio signal other than the specific frequency component in a specific band unit and quantizing and losslessly-encoding the envelope;

    selecting a codebook that is most similar to the other frequency component to be encoded from the codebooks and determining a codebook index (fine structure);

    losslessly-encoding the determined codebook index; and

    generating a bit stream using losslessly-encoded data generated in the lossless-encoding of the specific frequency component, the envelope, and the determined codebook index.

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