Hi Steve, You probably have read more on this already than I have, but I believe the reason for using sound rather than bluetooth is that RF can see through walls, and very high-frequency sound can’t. They wanted a signal that would be positive for people in the same interior space, but not for people who were on opposite sides of a wall through which there wouldn’t be air connection.
I forget where I got that, possibly from the company’s site, though several months ago. Or did I misunderstand the subject you meant? Thx, E > On Dec 15, 2020, at 5:43 PM, Steve Smith <[email protected]> wrote: > > Eric - > > Great story/shout-out to those who create/maintained a "pocket of sanity" for > you. I feel similarly with the Los Alamos County swimming pool which manages > to be hyper-welcoming whilst managing things in a convincingly safe manner > (w/o seeming arbitrary?). It helps that there is chlorinated water > everywhere, though I don't know the relevant concentrations in this case... > > Also fascinating that it uses hypersonic audio (mic and speaker) to exchange > "public keys". I have a camera/app that does this but in the audible > spectrum which is vaguely annoying. In the camera case it works a bit like > a two-factor authentication, or an ID-free bootstrapping. I think the > camera starts by chattering gibberish that the app hears and recognizes as > "one of it's own" which then triggers the app or camera to reach out over > wifi and make a connection there. I have a few tone generator apps and an > oscilliscope app which samples the headphone/mic input... I'm guessing I > could kludge a simple NOVID detector and even do some kind of reverse > engineering of it? I don't see any particular reason that an audio > "detection" is better than a BT one excepting maybe that the latter can be > power hungry (compared to a frequent ultrasonic chirp? or that the BT apps > use BT:MAC addresses at some level (implying less privacy)? > > I'm mildly disturbed by the implications of a hypersonic "dogwhistle" app, > though current low-tech modes of signaling one's proclivities and loyalties > is plenty effective (Mason's rings, secret handshakes, code words, etc.) > > Next thing we'll all be putting bandaids over our microphones on our devices? > > - Steve > > > > On 12/15/20 12:14 PM, David Eric Smith wrote: >> Yes, seems to be a good app. >> >> Georgia Tech has set up a group account that one can log into, and it is >> part of their campus surveillance system. >> >> I do have to stop, and do something probably nobody on the list has any >> reason to care about, to give a shout-out to them. The current GT >> monitoring system was designed, I think mostly if not entirely, by a young >> biophysics faculty (Josh Weitz) working with the department head (Greg >> Gibson). Since early in the year, maybe April or May, they have had a >> streamlined testing pipeline, and their target (which I think they mostly >> approach) is to test the entire on-campus community weekly. Their >> positivity return rate during the summer was around 0.3% for a couple of >> months; in the autumn it climbed back up through 0.7% and toward a percent, >> and the messages and exhortations started to come in fast and thick. All >> that went together with refitting many buildings, including the old biology >> building where my office is, built in the middle Stone Age, with HEPA >> filters and UV irradiators in the HVAC ducts, occupancy protocols, and >> various else. Certainly the effort involved was enormous work from a large >> number of people, and the two main guys were mainly designers and >> participants in the choreography. But overall it has had the feeling of a >> pocket of sanity and good practice that would have been in place in any >> number of civilized countries in the Eastern hemisphere. With the expected >> results of providing mostly excellent protection for a community of people. >> And that, for a state school. >> >> I do not know (have asked a CDC epidemiologist friend, who also doesn’t >> know) how much efficacy data has been compiled for NOVID-using communities: >> that is; what fraction of cases that would have escaped to potentially >> transmit, did they catch and get safely into a quarantine before anybody >> else was exposed? Iceland did a great job of that with manual contact >> tracing back in the earliest days. The real figure of merit for >> NOVID will be how much of that effect it can contribute through a >> decentralized computer app, which at least offers better scaling cost than >> manual contact tracing once the distribution is wide. If somebody on the >> list finds good data on that, I would be interested to know. >> >> Eric >> >> >> >>> On Dec 15, 2020, at 1:12 PM, Tom Johnson <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> NOVID is the first pre-exposure notification app to fight COVID-19. It’s >>> free, anonymous, and shows you cases close in your network before you’re >>> exposed. It only takes one minute to download. 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