acoustic communication between machines 

What would be an effective and noise robust way to communicate between two machines by way of sending audio through the air (speaker -> mic)?

Could I use a biphase-mark-code for that, say with 8N1 encoding? But how to represent the bits? Two alternating frequencies in a range less prone to noise? Or frequency-band on/off? Needs to be easy to decode in real-time in SuperCollider.

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acoustic communication between machines 

@sciss Prior art that might already be on your radar (or sonar har har har): github.com/quiet/quiet

(I don't know anything about implementation but this stuck in my brain like a tick when I saw it)

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