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Methods and apparatus for audio watermarking

  • US 9,697,839 B2
  • Filed: 07/15/2015
  • Issued: 07/04/2017
  • Est. Priority Date: 03/30/2010
  • Status: Active Grant
First Claim
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1. A method comprising:

  • obtaining, by executing an instruction with a processor, a watermarked noise signal having energy in a first frequency band, the watermarked noise signal being associated with a first operating state of a device;

    adjusting, by executing an instruction with the processor, the watermarked noise signal based on an ambient audio level sensed by an audio sensor; and

    emitting the adjusted watermarked noise signal via a speaker in response to determining that the device is in the first operating state.

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