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Power efficient detection of watermarks in media signals

  • US 9,904,968 B2
  • Filed: 04/24/2017
  • Issued: 02/27/2018
  • Est. Priority Date: 12/31/2014
  • Status: Active Grant
First Claim
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1. A media device meter comprising:

  • a watermark detector to detect watermarks in a media signal; and

    a watermark controller to;

    operate the watermark detector in a first operating mode to detect a first watermark in the media signal; and

    in response to the first watermark being verified, operate the watermark detector in a second operating mode in which the watermark detector cycles between sleep intervals and active intervals to detect a second watermark at a second location in the media signal relative to a first location of the first watermark in the media signal.

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