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Probabilistic methods and apparatus to determine the state of a media device

  • US 9,294,813 B2
  • Filed: 06/17/2014
  • Issued: 03/22/2016
  • Est. Priority Date: 10/31/2008
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • generating, based on a first output signal from a first sensor, a first parameter value representative of a first property of a media device;

    generating, based on a second output signal from a second sensor, a second parameter value representative of a second property of the media device;

    calculating a first state probability that the media device is presenting media provided by a first source based on a first conditional probability associated with the first parameter value and a second conditional probability associated with the second parameter value;

    calculating a second state probability that the media device is presenting media provided by a second source different than the first source based on a third conditional probability associated with the first parameter value and a fourth conditional probability associated with the second parameter value; and

    generating a state identifier by comparing the first state probability and the second state probability.

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