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Inference of timestamp, location, and signature information using statistical signal processing of powerline data

  • US 9,965,818 B2
  • Filed: 08/14/2014
  • Issued: 05/08/2018
  • Est. Priority Date: 08/15/2013
  • Status: Active Grant
First Claim
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1. A system comprising:

  • an electric network frequency (ENF) forensic database storing powerline data collected from at least one electrical power grid, the powerline data comprising a plurality of data points representing changes within electric fields associated with at least one electrical power grid over time and including at least one of information indicative of times at which specific data points were obtained and information identifying a location in the at least one electrical power grid from which the specific data points were obtained;

    an ENF extraction processing module extracting ENF content coupled into a recording; and

    a comparison processing module comparing the extracted ENF content with powerline data retrieved from the ENF forensic database and outputting information including one or more of a time during which the recording was made and a particular location where the recording was made based on the comparison with the powerline data, wherein the comparison processing module further compares the extracted ENF content with the powerline data retrieved from the ENF forensic database to identify a best match between the extracted content and at least a portion of the powerline data and displays a visual representation of the extracted ENF content together with the at least a portion of the powerline data identified as being the best match.

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