Patent ID: 11942099
Assignee: THE NIELSEN COMPANY (US), LLC
Field: Telecommunications (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 6:
7. A people monitoring method comprising:
detecting, by executing an instruction with at least one processor, a first watermark in a first audio signal obtained by an acoustic sensor, the first watermark identifying media presented by a monitored media device;
determining, by executing an instruction with the at least one processor, whether a second watermark, different from the first watermark, is embedded in the first audio signal obtained by the acoustic sensor, transmission of the second watermark triggered based on a geographic location of a mobile device, the second watermark identifying at least one of the mobile device or a user of the mobile device;
classifying, by executing an instruction with the at least one processor, the second watermark as a media watermark or a people monitoring watermark based on a characteristic of the second watermark; and
when the second watermark is determined to be embedded in the first audio signal, reporting at least one of the second watermark or information decoded from the second watermark to identify at least one of the mobile device or the user of the mobile device as exposed to the media presented by the monitored media device.