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I remember reading a paper where the author had a proof-of-concept for sending data over audio using an algorithm that created pleasing sounds in the normal hearing range.

Does anyone know what I'm talking about? Some of the demos sounded like R2D2 but also carried data. I can't find it using a Google search.

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I don't know the paper, but I'm actually working on an Arduino library for data over sound and I think it kind of sounds similar to R2D2. Here is a 1 min demo if you are interested:

https://www.youtube.com/watch?v=qbzKo3zbQcI

Ooh, thanks for the link!

I think the researcher I had in mind was funded by Microsoft, or worked for Microsoft? They sounded like little robotic bird calls or something.

It's like Chirp.io took a single example from that paper and used it exclusively.

This is almost certainly not the specific algorithm you're referring to, but Olivia MFSK sounds pleasing and can send 150 char/minute with a 7-bit ASCII data set: https://www.youtube.com/watch?v=Yz7a--ePSNs

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