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Steganographic encoding and decoding of auxiliary codes in media signals

  • US 6,944,298 B1
  • Filed: 05/31/2000
  • Issued: 09/13/2005
  • Est. Priority Date: 11/18/1993
  • Status: Expired due to Fees
First Claim
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1. A method of decoding an auxiliary code embedded in an audio signal, the method comprising:

  • performing statistical decoding of a multibit auxiliary code embedded in an audio signal, where the auxiliary code has been repetitively embedded in the audio signal;

    decoding code values of the auxiliary code from two or more different portions of the audio signal, each having the multibit auxiliary code;

    wherein statistical features of portions of the audio signal have been modified according to statistical features associated with the code values to embed the code values in the audio signal;

    using the code values decoded from the two or more different portions of the audio signal to determine statistically the code values of the auxiliary code.

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