Snooping TV.

Please quote that bit dennis. What I actually wrote - not what you think I wrote.

BTW, if you can get a Calrec Soundfield for pennies, I'll give you a quid for it.

There you go, dennis. A perfect opportunity for you to show all those nasty union types just how it should be done.

well no, because it doesn't work like that now

but the discussion is about how it could work if they wanted it to be secure

but if it's encrypted and you don't know the key, it won't match when the recipient decrypts it

and the recipient isn't a web browser that can choose to ignore a sig that doesn't match

It's a specifically written embedded program that chooses to throw away

tim

well yes

but academia puts a lot of effort into making crypto that takes years to break by brute-force

you're only doing it once every few months

and the decryption time is going to dwarf the download time (given the likely need to repeat each packet to resolve transmission errors)

tim

they was some speculation that they were only pretending that they needed Apple to unlock the phone so as not to warn "naughty" people that they could really

tim

Judging by what is in a typical laptop - a few dozen. That's why in modern systems the power management controller is a fairly sophisticated ASIC. Power management controllers will not only handle all the various power modes, they often handle lots of built in test capability and diagnostics, as well as sequenced switch on. So lots of feedback taps from either side of current sense resistors, and gated control of buck converters and so on.

Its already used in practice... as I mentioned before timed recording, OTT updates etc.

The high end Samsung stuff is anything but budget! Go look at some of their 4K OLED models...

Did you read the section on Krebs page entitled: "While my smart TV gently weeps"?

in the case being talked about, the set was not remotely exploitable anyway. It needed local access and a USB upload.

You are the one trying to side track spying into production for some reason known to you. BTW which bit of a sound field mic is expensive?

Places sound souces on a sphere around the listener, combination of left/right and up/down. But there is still no near/far information.

Lots of speculation on here too. ;-)

So just what can be switched off on a laptop that wouldn't be needed under normal use? Generally when making things by the million you don't put in facilities that will never be needed.

Have you actually known any set do a software update without switching on?

Still at the budget end of that sector.

But surely for this system to be of much use, it's going to have to work with any TV with a built in mic?

You could measure the time taken for a point source to reach each of the capsules and calculate distance from that. If you really wanted to.

You don't buy bits of a sound field mic.

So what are you going to claim now?

That because there is only one place you can buy a product its expensive to make?

Do you not think that your insistence on talking about niche products is actually irrelevant?

If I was making a mic array I would certainly be buying bits. What i charged for the system would depend on how much mugs would pay for it.

Although more secure than a WinDozey webcam the only sure way to prevent hacker webcam snooping is a physical cover over the lens. This is particularly true for government funded intelligence service hackers.

The technology is reasonably well established for some smart phones.

That isn't usually the case at least for more modern TVs. The only part that is running is the low power remote control detector in a wake on signal mode. Typical standby consumption

That is probably because it continues to power the mast head amplifier decode the signal even when it is nominally in standby! Had an early digital TV that had similarly profligate standby power usage running the decoder continuously for the SCART output to video recorder by default. It could be switched off but only after a long trawl through many levels of menus of twisty little passages all alike.

Worth testing which of your kit has acceptable standby power usage. It would also allow you to spot a TV "playing dead" but actually running the relatively power hungry signal processing subsystems.

True, human ears can detect about a 1usecond difference in arrival time for a single tone sound source by turning the head.

Capsules are aboout 1" apart, if that.

Sound travels at about 750 mph (variable on pressure, temperature and humidity). Thats about 13,200"/sec or 75 micro seconds / inch. Lets say the B format extends to 20 kHz, maxium resolution 50 us... You could get something but it would be rather vague. You probably need a resolution greater than a 1/10th the maximum Time of Arrival differnce to get meaningfull answers. 7 us = response up to about 150 kHz.

Spacing the capsules further apart would reduce the required timing resolution. Four mics at each corner of a 42" screen would give ToA differences up to a few milli seconds, far more manageable.

I don't claim anything, dennis. Just correct your illusions.

Making things in limited quantities always makes them more expensive.

You are the one who started this 'what if' nonsense.

The one thing you've got right is only mugs would buy such a thing from you.

If you're talking echo cancellation at highish fequencies, the accuracy needed for that is rather high too. ;-)

I've had a brilliant idea. Why not just have your snoop mic array inside the TV remote? That is far more likely to be close to where people are talking in the room. ;-)