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Methods and appratus for characterizing media

  • US 8,060,372 B2
  • Filed: 02/20/2008
  • Issued: 11/15/2011
  • Est. Priority Date: 02/20/2007
  • Status: Expired due to Fees
First Claim
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1. An apparatus to characterize media comprising:

  • a sample generator to capture a block of audio;

    a transformer to convert at least a portion of the block of audio into a frequency domain representation including a plurality of complex-valued frequency components;

    a decision metric computer to;

    define a band of complex-valued frequency components for consideration;

    determine a decision metric using the band of complex-valued frequency components by convolving a group of the complex-valued frequency components in the band with a pair of complex vectors, each of the pair of complex vectors and the group of the complex-valued frequency components having an odd number of elements greater than one; and

    a signature determiner to determine a signature bit based on a value of the decision metric, wherein at least one of the decision metric computer or the signature determiner is implemented using a processor.

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