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Stealthy audio watermarking

  • US 7,266,697 B2
  • Filed: 05/03/2004
  • Issued: 09/04/2007
  • Est. Priority Date: 07/13/1999
  • Status: Expired due to Fees
First Claim
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1. A method for encoding values within a digital audio signal, the method comprising:

  • receiving the digital audio signal having frequency magnitude components;

    analyzing the relative energy levels of the frequency magnitude components of the signal;

    determining whether the signal has a large discrepancy in the relative energy levels of the frequency magnitude components, wherein the large discrepancy is a discrepancy of a factor of three or more;

    encoding at least one bit of the digital watermark into the digital signal based on the determination.

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