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Recognizer of content of digital signals

  • US 6,971,013 B2
  • Filed: 12/15/2004
  • Issued: 11/29/2005
  • Est. Priority Date: 04/24/2001
  • Status: Expired due to Fees
First Claim
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1. One or more computer-storage media having computer-executable instructions that, when executed by a computer, perform acts for hashing a digital signal, the acts comprising:

  • transforming the digital signal into a digital signal transform;

    randomly dividing the digital signal transform into multiple chunks, each chunk containing signal data, wherein the dividing is carried out recursively to form hierarchical levels of overlapping chunks;

    averaging, for each of the chunks, the signal data to produce corresponding chunk averages;

    generating, based in part on the chunk averages, an exponential distribution having multiple distinct quantization levels;

    randomly rounding each of the chunk averages to one of the quantization levels to produce rounded values; and

    hashing a composite of the rounded values.

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