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I actually wrote a library that does this, FSK to WAV and back is just a few lines of code, and fairly reliable. There are even Javascript libraries that can do it.

I think it probably is real, it just shouldn't be. :-/

Isn't that what Clinkle was supposed to be using? It was supposed to be the hot new tech that could replace NFC. Or something or other...

[1] http://www.thewire.com/technology/2013/07/what-is-clinkle/66...

That's actually pretty established technology nowadays. I'm not surprised they're using it.

Ultrasonic communication is also used by some of the 2nd screen tv apps.

Doesn't the Chromecast have that capability?