On Apr 2, 2008, at 5:05 PM, John Watlington wrote: > > On Apr 2, 2008, at 4:00 PM, Martin Langhoff wrote: > >> On Wed, Apr 2, 2008 at 3:38 PM, <[EMAIL PROTECTED]> wrote: >>> the problem with trying to use sound is that it requres a clear >>> path from >>> the servers to the laptops, something I would not expect to see >>> very much. >>> it's also very sensitive to the direction the laptops are pointing. >> >> Absolutely, and the XS doesn't have mics, even less directional >> mics ;-) > > It's in that hole on the left hand side of the screen...
It has been pointed out that I've gotten to old to tell the difference between XO and XS. I have no defence... We could make the XS beep, and triangulate its location from the laptop locations... >> The 802.11 signal will also have dirty paths in some directions. >> Strategic antenna location and signal timing is the only way I can >> see >> this working. It would be fantastic to have a simple thing to demo >> physics and maths based on such triangulation. > > At 2.4 GHz, the interference between multiple paths makes > signal level measurement pretty useless for determining position. > If you do this to a number of spatially distributed access points, > you can improve the estimate... This is how the Bluetooth Location > service works... > > wad _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel