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Display device ON/OFF detection methods and apparatus

  • US 10,110,889 B2
  • Filed: 04/20/2018
  • Issued: 10/23/2018
  • Est. Priority Date: 08/16/2005
  • Status: Active Grant
First Claim
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1. A metering apparatus comprising:

  • first means for sensing an audio signal output from a media device;

    second means for performing audio code detection to detect audio codes in the audio signal;

    third means for determining an audio gain level applied to the audio signal; and

    fourth means for determining whether the media device is ON or OFF based on the audio gain level applied to the audio signal and whether a valid audio code is detected in the audio signal.

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