101–110 of 199 posts
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Make that "every vibrating surface can be a potential microphone ..."
The laser on a hotel window experiment comes to mind.
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Yes, but things could be refined. With more resources and research thrown at it, it could become more versatile, that's why the title of the post says "could". And chances are, there are private and government entities already doing this. Research like this has been coming out for at least a decade now. Even Xfinity has motion detection in homes using this technique now: https://www.xfinity.com/hub/smart-home/wifi-mo…
Yeah, it can and will be refined, but the major limiting factor is resolution. Wi-Fi radio waves are just too big to get a very clear image.
How good is ethernet over electrical sockets these days. I had one about 15 years ago maybe, but it wasn't that good. Has tech changed. I'd use it over my wifi setup if its was fast.
This tech is known as BPL(broadband over powerline) if you want to look further into it.
My understanding is that it has improved in some circumstances, but if the connection ends up "hopping" through your breaker you get back to garbage speeds.
In theory you can get 2 Gbps speeds, but in practice it seems like still around 500 Mbps. I don't know if the loss has improved but it was a significant problem before, since even a low loss will render a connection unusable.
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Modern phones connect with a randomized MAC address. So yes, you can track a person around, but you will need another system (like the WiFi login page) to match MAC to identity.
Really? I thought it was only I phones that did that though?
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Resolution and positional accuracy are very poor. It’s more like ‘an approximate bag of water detector’. Gait analysis is complete fiction. Especially with a non-visual approach like this.
Given the number of gait analysis publications over several decades using varying techniques, can you recommend a good review article disproving all of them?
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Yeah, it can and will be refined, but the major limiting factor is resolution. Wi-Fi radio waves are just too big to get a very clear image.
for now ...
Your resolution limit is about 30mm as a result.
This is a VERY controlled environment - and they used 20 passes of each person walking with direct knowledge of each person to train for identity. They did no tests with multiple people walking at the same time, or with any other external moving distortion effects (doors opening, etc) . This is very far from actual 'identification' of people in real public settings - and no doubt the cell phone everyone is carrying w…
Yes, you won't be able to do this on normal wifi traffic typically either, you need to send specific packets at a high enough rate (in between normal internet traffic) in order to sense with any accuracy, as I also remarked earlier: https://news.ycombinator.com/item?id=46976849
This is a VERY controlled environment - and they used 20 passes of each person walking with direct knowledge of each person to train for identity. They did no tests with multiple people walking at the same time, or with any other external moving distortion effects (doors opening, etc) . This is very far from actual 'identification' of people in real public settings - and no doubt the cell phone everyone is carrying w…
Yes, but things could be refined. With more resources and research thrown at it, it could become more versatile, that's why the title of the post says "could". And chances are, there are private and government entities already doing this. Research like this has been coming out for at least a decade now. Even Xfinity has motion detection in homes using this technique now: https://www.xfinity.com/hub/smart-home/wifi-mo…
Earlier quoted context omitted.
for now ...
No this is fixed by physics. 5ghz waves are about 60mm wavelength. Your resolution limit is about 30mm as a result.