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A comment on Alexa and Siri Can Hear Hidden Commands. Parent comment

Re:Alexa and Siri Can Hear Hidden Commands by jedberg on Thursday May 10, 2018 @04:50PM (#17042834)
> and uses the identifiers to track which channels are getting played.

I don't think they're using infrasound for that. I think they use a technology similar to Shazam where it just analyzes the sound to determine what's on.

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Re:Alexa and Siri Can Hear Hidden Commands by amitparikh on Thursday May 10, 2018 @06:47PM (#17043578)
They are, it's one of the reasons they [Nielsen] bought Arbitron back in 2013. The PPM devices use low-frequency tones encoded into the audio stream at the time of broadcast.

https://en.wikipedia.org/wiki/Portable_People_Meter

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