Linked by Thom Holwerda on Tue 10th Jul 2012 01:24 UTC
Microsoft "Microsoft and Perceptive Pixel Inc. (PPI) today announced that they have entered into a definitive agreement under which Microsoft will acquire PPI, a recognized leader in research, development and production of large-scale, multi-touch display solutions." Yes, Jeff Han is now a Microsoft employee. This demo still amazes me - from 2006. Before the iPhone. Before Android. Before the iPad. Remember that the next time you wind up in a discussion about who supposedly invented what.
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RE[5]: I built one too!
by Alfman on Wed 11th Jul 2012 14:51 UTC in reply to "RE[4]: I built one too!"
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"I think you've missed my point because wind speed should never need to come into the equation unless you're using the general purpose front mic (which, quite frankly, is a silly idea)."

Firstly, if the mic picks up the frequencies you need, then it's not silly at all. If it doesn't, then you'll need something more specialised, but as a hobby project it makes plenty of sense to start out with off the shelf equipment when possible.

Secondly, any acoustic system will necessarily be affected by windspeed regardless of the equipment you use. I think you may have misunderstood me, I'm not talking about noises caused by wind, I'm talking about the physics of audio propagation and how wind will offset the triangulation of a ping from it's true origin.

Therefore, IF wind is anticipated (ie outdoors), then it must be compensated or it will affect the accuracy of the system.


Neolander is talking about detecting taps on against a board, but I'm talking about tracking a stylus in 2d/3d space using emitors and microphones. It could scale to large natural areas like the football example, or maybe even in swimming pools.

Of course, it makes more sense to use radio instead, but the discussion was about DIY projects, where audio is easy to do.

Edited 2012-07-11 15:08 UTC

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