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Methods and apparatus for embedding codes in compressed audio data streams

  • US 8,078,301 B2
  • Filed: 10/10/2007
  • Issued: 12/13/2011
  • Est. Priority Date: 10/11/2006
  • Status: Expired due to Fees
First Claim
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1. A method to embed a code in a compressed audio data stream comprising:

  • obtaining a plurality of transform coefficients from the compressed audio data stream, wherein the plurality of transform coefficients is represented by a respective plurality of mantissas and a respective plurality of scale factors;

    determining a plurality of reconstructed time domain samples corresponding to the plurality of transform coefficients;

    determining a temporary watermarked transform coefficient corresponding to a first transform coefficient in the plurality of transform coefficients, the temporary watermarked transform coefficient determined for a combination of the plurality of reconstructed time domain samples with the code; and

    modifying a first mantissa and a first scale factor associated with the first transform coefficient to embed the code in the compressed audio data stream by comparing the first mantissa and the first scale factor with a second mantissa and a second scale factor associated with the temporary watermarked transform coefficient to determine a modification to the first mantissa and the first scale factor for embedding the code.

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