they are using non-linear properties of the air to downconvert from 60kHz to the audible range. in other words, the mixer is not stable or even reproducible over a range of different air conditions like humudity, pressure, temperature, etc (fog is a good example). bottom line is, while definitely a cute idea this is not for any concert or even consumer music, the quality is simply going to be way too low. but for "crowd control" and other.mil uses this might be OK. speech might be OK too, but no music, forget about music.
the important difference is that earth's magnetic field is static, while the one generated by high voltage lines is not. 50-60 Hz might not seem like much, but it creates extemely weak electrical fields anyway (smth to the tune of curl E = -1/c dH/dt ) and those induce currents in your skin. earth's magnetic field never does that, plus we had some time (10^9 years) to adapt to it, while AC fields are very new (10^2 years) and long term effects are largely unknown. in my personal experience, having lived once very close to high voltage lines for a month or so, they are certainly quite uncomforatble. if not for em emissions, they certainly produce a lot of mechanical vibration and noise. cell phones are much worse than any of that. i did some experiments and the net result is that talking on a cell phone is like having your ear hard pressed against the closed door of the working microwave oven. yeah, it's probably nothing but look at that chicken inside
By the way, what would be powering these chips? What happens when that power source dies?
the chip is completely passive and
gets the power from the radio waves of the
scanner.
it's the oldest trick in the book,
the scanner applies a powerful signal at a
certain frequency and that is enough to get the chip working. the chips reply signal is much weaker, but it's at a different frequency so it's not too hard to detect.
oh, and the 12" distance limit could be extended to at least a 100m or so
1 in 200 Billion is a very low bit error rate.
i hope you heard about error correction schemes
and how amazingly well they work even at much
higher bit error rates. 100 GHz is a more serious
target, but 10 GHz is a joke even for a general
purpose microprocessor. there are DSP chips running today at 5 GHz clocks, and some analog
parts clocking at 15+ gigs, no sweat (in 0.18 CMOS). for example, read the ISSCC 2001 advance abstracts.
basically, you are a troll talking out of your ass.
The article's author misses the whole point:
"... And with computers, it is also possible that their largest benefits have already been realized..."
WHAT?! HA HA HA. The computer revolution is just
beginning, it still is in very, very early stages. I'd like to talk to the author 50 years from now, when he, having safely downloaded himself into a computer network, is designing his next young body from scratch, using the latest research in DNA.
imagine a boat filled to the brim with DVDs, you just cannot beat the bandwidth it gets you. yes, latency is somewhat suboptimal, but throughput is really, really amazing.
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they are using non-linear properties of the air to downconvert from 60kHz to the audible range. in other words, the mixer is not stable or even reproducible over a range of different air conditions like humudity, pressure, temperature, etc (fog is a good example). bottom line is, while definitely a cute idea this is not for any concert or even consumer music, the quality is simply going to be way too low. but for "crowd control" and other .mil uses this might be OK. speech might be OK too, but no music, forget about music.
the important difference is that earth's magnetic field is static, while the one generated by high voltage lines is not. 50-60 Hz might not seem like much, but it creates extemely weak electrical fields anyway (smth to the tune of curl E = -1/c dH/dt ) and those induce currents in your skin. earth's magnetic field never does that, plus we had some time (10^9 years) to adapt to it, while AC fields are very new (10^2 years) and long term effects are largely unknown. in my personal experience, having lived once very close to high voltage lines for a month or so, they are certainly quite uncomforatble. if not for em emissions, they certainly produce a lot of mechanical vibration and noise. cell phones are much worse than any of that. i did some experiments and the net result is that talking on a cell phone is like having your ear hard pressed against the closed door of the working microwave oven. yeah, it's probably nothing but look at that chicken inside
the chip is completely passive and gets the power from the radio waves of the scanner.
it's the oldest trick in the book, the scanner applies a powerful signal at a certain frequency and that is enough to get the chip working. the chips reply signal is much weaker, but it's at a different frequency so it's not too hard to detect.
oh, and the 12" distance limit could be extended to at least a 100m or so
Ha ha ha ! And this is fucking "insightful"??
Please.
1cm is 1/2.54 of a fucking inch.
Most people can easily see a fraction of 1mm which is 0.1 cm.
With a naked eye, yes.
1 in 200 Billion is a very low bit error rate. i hope you heard about error correction schemes and how amazingly well they work even at much higher bit error rates. 100 GHz is a more serious target, but 10 GHz is a joke even for a general purpose microprocessor. there are DSP chips running today at 5 GHz clocks, and some analog parts clocking at 15+ gigs, no sweat (in 0.18 CMOS). for example, read the ISSCC 2001 advance abstracts. basically, you are a troll talking out of your ass.
The article's author misses the whole point: " ... And with computers, it is also possible that their largest benefits have already been realized..."
WHAT?! HA HA HA. The computer revolution is just
beginning, it still is in very, very early stages. I'd like to talk to the author 50 years from now, when he, having safely downloaded himself into a computer network, is designing his next young body from scratch, using the latest research in DNA.
imagine a boat filled to the brim with DVDs, you just cannot beat the bandwidth it gets you. yes, latency is somewhat suboptimal, but throughput is really, really amazing.
ssh needs to have a socks support, to be usable from behind a corp. firewall. could not find that option anywhere --with-socks or something