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Bunnie Huang has published a reference design for a near-ultrasound data link.
We were requested to investigate “near ultrasound” (NUS) links as part of our research on developing the Simmel reference design for a privacy-preserving COVID-19 contact tracing device. After a month of poking at it, the TL;DR is that, as suspected, the physics of NUS is not conducive to reliable contact tracing. While BLE has the problem that you have too many false positive contacts, NUS has the problem of too many false negatives: pockets, purses, and your own body can effectively block the signal.
That being said, we did develop a pretty decent-performing NUS data link, so we’ve packed up what we did into an open source reference design that you can clone and use in your own projects.
Previously:
(2020) Your Apps Can Pick Up Ultrasonic Signals You Can't Hear
(2017) Ultrasound Tracking Could be Used to Deanonymize Tor Users
(Score: 2) by c0lo on Saturday July 11 2020, @01:10AM (6 children)
I guess your sane people call "near infrared" just "red", eh?
(bloody idiot, a waste of breathing space)
https://www.youtube.com/watch?v=aoFiw2jMy-0 https://soylentnews.org/~MichaelDavidCrawford
(Score: -1, Troll) by Anonymous Coward on Saturday July 11 2020, @01:22AM
Whoosh! Just waiting for pink-hair SJW to make irate comment about genderist post and OP has hit the trolling trifecta.
(Score: 2) by HiThere on Saturday July 11 2020, @03:37AM (4 children)
Somehow sounds don't seem to have spectral names the way colors do, so you can't call it indigo. But you could list a range of frequencies (specified by musical pitch for ready interpretation). I probably wouldn't be able to hear it, so to me it would probably be sound. That six year old over there might well hear it just fine, and be first intrigued and then annoyed. And my dog .... well, stereotypes to the contrary, she probably wouldn't be able to hear it, as she's 15 years old and getting a bit deaf.
Javascript is what you use to allow unknown third parties to run software you have no idea about on your computer.
(Score: 2) by HiThere on Saturday July 11 2020, @03:39AM
Agggh...
change "so to me it would probably be sound."
to "so to me it would probably be ultra-sonic sound."
Javascript is what you use to allow unknown third parties to run software you have no idea about on your computer.
(Score: 2) by FatPhil on Saturday July 11 2020, @07:28AM (2 children)
So it's ultrasound, but only just. Or near-ultrasound to use the preferred technical name.
It's an easy terminology to adopt and adapt - for example, the OP is a near-untertroll.
Great minds discuss ideas; average minds discuss events; small minds discuss people; the smallest discuss themselves
(Score: 0) by Anonymous Coward on Saturday July 11 2020, @07:46AM (1 child)
Give him a chance, likely he's a wannabe troll.
(Score: 0) by Anonymous Coward on Saturday July 11 2020, @11:05AM
Is it still "feeding the troll" if you troll the troll into more trolling, without him (her??) realizing he's himself being trolled?
Is counter-trolling a societally acceptable activity?