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Method and apparatus for monitoring audio listening

  • US 7,486,925 B2
  • Filed: 01/25/2007
  • Issued: 02/03/2009
  • Est. Priority Date: 03/07/2002
  • Status: Expired due to Fees
First Claim
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1. A method for receiving, detecting, collecting and analyzing program material-identifying (“

  • PMI”

    ) information contained in a plurality of broadcast or recorded electronic audio signals, each audio signal representing sounds in a plurality of sequential program segments, each item of PMI information corresponding to a particular program segment, said method comprising the steps of;

    (a) receiving a selected one of said audio signals at each of a plurality of remote locations;

    (b) reproducing the sounds represented by said selected audio signal at each remote location;

    (c) converting the sounds into a second electronic signal at each remote location;

    (d) detecting the PMI information from the second signal at each remote location;

    (e) storing the detected PMI information at each remote location;

    (f) storing the date and time of receipt of said selected audio signal in association with said PMI information;

    (g) establishing a wireless communication link between each remote location and a central computer at another location and transmitting the PMI information and its associated date and time to said central computer;

    (h) storing the PMI information and its associated date and time received from said plurality of remote locations at said central computer; and

    (i) analyzing the stored PMI information and its associated date and time;

    wherein said PMI information comprises inaudible information embedded in said audio signals.

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