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Audio watermarking for people monitoring

  • US 10,410,643 B2
  • Filed: 07/15/2014
  • Issued: 09/10/2019
  • Est. Priority Date: 07/15/2014
  • Status: Active Grant
First Claim
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1. A people monitoring method comprising:

  • determining, by executing an instruction with a processor at a mobile device, whether a first audio signal sensed at the mobile device satisfies a first trigger condition for emitting a first audio watermark identifying at least one of the mobile device or a user of the mobile device, the first trigger condition being satisfied when the first audio signal sensed at the mobile device is determined to include a second audio watermark; and

    in response to determining that the first audio signal sensed at the mobile device includes the second audio watermark and that the mobile device is in an operating state in which a ringtone is to be output;

    obtaining, by executing an instruction with the processor, a ringtone audio signal including the first audio watermark identifying the at least one of the mobile device or the user of the mobile device, the ringtone audio signal being a second audio signal different from the first audio signal; and

    causing, by executing an instruction with the processor, the ringtone audio signal including the first audio watermark identifying the at least one of the mobile device or the user of the mobile device to be provided to an audio circuit that is to output an acoustic signal from the mobile device.

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