wave-share

to try out :) The implemented data-over-sound protocol is quite simple. It is essentially a 6-tone FSK modulation scheme with special markers to mark the start and end of the transmission. The bandwidth is quite low (8-16 B/s), but I think the transmission is reliable. I've been testing it with a few devices across the room and it seems robust enough. The ultrasound protocols especially are very robust to surrounding noise. An additional challenge I had to solve while working on the data-over-sound protocol was to make the encoded data sound good to the human ear. Although the current sound is not the most pleasant thing to hear (especially the markers), I think it turned out relatively OK :-) There are a few reasons about why I decided to implement this FSK approach instead of using an existing and well-known modulation scheme used by modems: - My DSP knowledge is fairly limited - Most modulations typically sound like noise (not very pleasant to the ear) - Reliable air-gapped transmission seems to be much more difficult to achieve compared to over-the-wire - But mainly because I find it more fun to implement something from scratch There are similar solutions available on the market, but I feel they are difficult to try out. I wanted to make something free and very easy to test and see how it works. The data-over-sound library [1] still needs some work, but it's getting there. I am hoping to find some fun and potentially useful applications of this, so I am looking for ideas. Also, any feedback about the performance is very much appreciated. If you decide to try out the Waver app, make sure to watch the 2 min video in the link [2] for a quick tutorial. Also, there is a small easter egg at the end of the video :-) [0] - https://github.com/ggerganov/wave-share [1] - https://github.com/ggerganov/ggwave [2] - https://www.youtube.com/watch?v=Zcgf77T71QM