Sonify 1 demo - sending data via ultrasound morse code
Channel: sq5bpf
Date: 2020-11-15

Sonify 1 "soft tempest" demo. Distance is about 5m (but it works at much greater distances,  even the microphone is overloaded in this case). See https://lipkowski.org/sonify



Receiver is DL4YHF Spectrum Lab with the Dell Latitude 5310 laptop internal microphone. , fldigi used for decoding. 



The decoding isn't great because the software morse code decoder in fldigi is bad (in the video i erroneously state that the morse decoder in Spectrum Lab is crap, i meant fldigi). This would be decoded 100% by a human at much worse S/N, in the presence of more echo etc.


With a directional ultrasound microphone and a human operator decoding the morse code this could be easily extended to several times the distance. Maybe i will show a demo of this in the future.


See https://lipkowski.com/sonify for details and https://github.com/sq5bpf/soft-tempest-demos for the scripts.