https://blogalytics.typepad.com/files/a-technical-look-at-arbitrons-ppm-system.pdf https://blogalytics.typepad.com/files/a-technical-look-at-ar... Not really.

https://blogalytics.typepad.com/files/a-technical-look-at-arbitrons-ppm-system.pdf https://blogalytics.typepad.com/files/a-technical-look-at-ar... Not really. And if a user does, they will hear rather mundane codec artifacts, and or noise that is basically like other noise. Given a redundant mark, and the system I linked has multiple, concurrent redundancy, the chance of the mark surviving grows with the amount of audio. They can literally drop marks during speech the entire time.