<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Steve,<div class=""><br class=""></div><div class="">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. </div><div class=""><br class=""></div><div class="">I forget where I got that, possibly from the company’s site, though several months ago.</div><div class=""><br class=""></div><div class="">Or did I misunderstand the subject you meant?</div><div class=""><br class=""></div><div class="">Thx,</div><div class=""><br class=""></div><div class="">E</div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Dec 15, 2020, at 5:43 PM, Steve Smith <<a href="mailto:sasmyth@swcp.com" class="">sasmyth@swcp.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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<div class=""><p class="">Eric -</p><p class="">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... <br class="">
</p><p class="">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)?</p><p class="">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.)</p><p class="">Next thing we'll all be putting bandaids over our microphones on
our devices?<br class="">
</p><p class="">- Steve<br class="">
</p><p class=""><br class="">
</p>
<div class="moz-cite-prefix">On 12/15/20 12:14 PM, David Eric Smith
wrote:<br class="">
</div>
<blockquote type="cite" cite="mid:59F46441-D8C1-40A8-8355-A9EC343D04BF@santafe.edu" class="">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" class="">
Yes, seems to be a good app.
<div class=""><br class="">
</div>
<div class="">Georgia Tech has set up a group account that one can
log into, and it is part of their campus surveillance system.</div>
<div class=""><br class="">
</div>
<div class="">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.</div>
<div class=""><br class="">
</div>
<div class="">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.</div>
<div class=""><br class="">
</div>
<div class="">Eric</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">
<div class=""><br class="">
<blockquote type="cite" class="">
<div class="">On Dec 15, 2020, at 1:12 PM, Tom Johnson <<a href="mailto:tom@jtjohnson.com" class="" moz-do-not-send="true">tom@jtjohnson.com</a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div dir="auto" class="">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. Please visit <a href="https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fnovid.org&c=E,1,VwlMJTw8gqSVqbo2jJiXmT5NM5NAq_5yttP-l2lMZNpp2VMc6PbSqDKtDArm04wXuOsKAwniiJ1YmGYvBupyCA7hDVU8uZl6NwnstOOkPcPVwTSWJKXWKZ6Q6A,,&typo=1" class="" moz-do-not-send="true">novid.org</a> </div>
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