3 ms·
My initial response was "Damn, I'm running everying off a UPS from now on" until I read this: Battery-powered devices are not immune to to ENF analysis, as gri
by furyg3 16y ago
My initial response was "Damn, I'm running everying off a UPS from now on" until I read this:
Battery-powered devices are not immune to to ENF analysis, as grid frequency variations can be induced in their recordings from a distance.
I'm slightly skeptical of that, but if it's true, it's pretty impressive.
- daten 16y agoI had the same response, but then I thought "wait, I don't do any covert and sketchy surveillance, this doesn't affect me". Can you think of any privacy concerns with this technology?
- khafra 16y ago"Damn, I'm running everything off a UPS from now on, and in a faraday cage if it's not far away enough from a mains line."
- ableal 16y agoJohn Varley's 1984 novella "Press Enter _" (Hugo winner 1985), had something along those lines, if memory serves.
- ars 16y agoFaraday cages don't block low frequency magnetic fields. You would also need some mu-metal. As a side note http://www.science-products.com/Products/CatalogA/Filters+Discriminators/HumBug/HumBug.pdf http://www.science-products.com/Products/CatalogA/Filters+Di... claims to be able to get rid of the signal.