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Comparison of data signals using characteristic electronic thumbprints extracted therefrom

  • US 7,853,438 B2
  • Filed: 07/31/2008
  • Issued: 12/14/2010
  • Est. Priority Date: 04/24/2001
  • Status: Expired due to Fees
First Claim
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1. A method for extracting a digital thumbprint based on at least a portion of a time-dependent data signal, the method comprising:

  • filtering the data signal to produce a plurality of filtered signals, at least two of the filtered signals having a different frequency range;

    computing a measure of power contained within at least a segment of each filtered signal;

    determining, by a computer processor, a plurality of coordinates for a digital thumbprint, wherein each coordinate is determined based on the computed measures of power; and

    writing a digital thumbprint to a non-transitory computer-readable storage medium, the digital thumbprint comprising the plurality of coordinates determined for the digital thumbprint.

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