D
Daniel Rapp
danielrapp.github.io · Personal blog · on HN since 2014
Daniel Rapp is a developer who builds small browser demos in signal and image processing, including Doppler motion sensing and spectrogram images.
What HN saysHN links it for the Doppler motion sensing demo, which a commenter says is simpler than FingerIO but still interesting, and for the spectroface demo.
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What HN people wrote when they linked it
JorgeGT · 2016-06-14
You may be interested in https://github.com/quiet/quiet-js and https://danielrapp.github.io/spectroface/, both encode text / images over audible frequencies, but of course they sound weird.
However it is technically trivial to encode "hidden" data at inaudible frequencies (>25 kHz) along with a song/whatever in the audible range and recover the data with a high pass filter. You would have to explain, however, the need for >48kHz sample rate.
Another, stealthier option would be to encode information in the background noise of a recording, but this would require more complex encoding/filtering techniques.
aub3bhat · 2016-03-18
This is not same as FingerIO since it does not uses sophisticated signal processing but still interesting.
Make sure that you remove earphones before using it.
https://danielrapp.github.io/doppler/