kelu124I'm gathering some info about these beacons - so I've been walking around with my phone to fish some interesting sounds.
Some examples include a beacon in a starbucks close to montparnasse : interesting central frequency at 20khz, and two side freqs at +-250hz
The spectrogram shows it continues:
On another hand, I was in a coffee (called Ajami possibly), and I found a nice peak around 20khz:
Now, all I need is understand what is inside =)
For those curious, data and code are at https://github.com/kelu124/ultrasHound/tree/master/mobile -- feel free to come and play.
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