31–40 of 54 posts
> The group tested an eclectic selection of materials, including a bag of chips (excellent), a soda can (surprisingly mediocre), and a potted plant (average). They were even able to recreate music playing using footage of the vibrating ear buds. The best material of all was the thin foil wrapper on a Lindt chocolate bar Davis had been snacking on. I hope it was the journalist who thought the soda can was surprisingly…
Disclaimer: I work for a professional microphone manufacturer. I wonder how long it'll be until this technique becomes feasible for recording professionally? Like, instead of capsules and diaphragms, we just have a laser that gets the cleanest, clearest possible signal it can, from the room around you ..
Throughout his administration, Mecham expressed concern about
possible eavesdropping on his private communications. A senior
member of Mecham's staff broke his leg after falling through a
false ceiling he had been crawling over, looking for covert
listening devices. A private investigator was hired to sweep
the governor's offices looking for bugs. The Governor was quoted
as saying, "Whenever I'm in my house or my office, I always have
a radio on. It keeps the lasers out." After this was reported,
a political cartoon by Pulitzer Prize winning cartoonist
Steve Benson appeared in the Arizona Republic depicting the
governor leaving his house outfitted for laser tag. When asked
about this by reporters, Attorney General Bob Corbin replied in
amusement, "We don't have any ray gun pointed at him."
Silly question: isn't this phenomenon bound by the Nyquist limit, which means it would take at the very least 4k fps to reconstruct music (considering that a soprano can get no higher than 2 kHz)? That sounds like an impossibly high framerate.
Specialist cameras hit 4k fps at second gear, and can go as high as million fps (and even trillion fps [2])!
Besides, this is about reproducing music frequencies, whereas the most probable target for this technology is eavesdropping, not as a replacement for Neumann U87 -- and for that you need way less range.
[1] https://www.theverge.com/circuitbreaker/2017/2/7/14532610/so...
[2] https://newatlas.com/fastest-camera-44-trillion-frames-per-s...
Earlier quoted context omitted.
Speakers and microphones are both transducers, which is what the author seems to be getting at.
But leafs shake because they receive waves. Not the other way around.
Earlier quoted context omitted.
But leafs shake because they receive waves. Not the other way around.
Another valid metaphor though is that video of the leaves can be decoded the same way video of a speaker would. The analogy works either way.
Another cool thing is recovery of picture from ambient reflected light. Sadly it only works on CRTs. https://www.cl.cam.ac.uk/~mgk25/emsec/optical-faq.html
Wow, "everything is a speaker" really fails to convey how crazy this is. The implications for this in terms of surveillance seem to be massive!
This is rather old news re surveillance.
Everything is a microphone?
I think you could hear that produced sound with a traditional microphone, but you would probably call it the echo of the original sound, and it might be hard to hear it over the original, typically much louder, sound.