Yeah! It works! Cassette to data, decoding in real time at 3k baud!

Some improvements to be made but super happy with this. This means I can encode a message to a cassette and then decode it without having to digitize the audio, as it's being digitized as it streams in.

So it could be nice for offline storage of sensitive data. This is the physical layer so of course its possible to add authenticated encryption as well.

For example you could leave a cassette at a dead drop with an ecash token on to pay your raw milk dealer.

The encoding mechanism is differential manchester encoding which means it should be more survivable on different cassette decks. I have some bad ones so I will test it.

In this short video I also explain it, although I think I mi's speak the band rate. It's 3k baud ish.