http://arstechnica.com/uncategorized/2003/09/2886-2/ http://arstechnica.com/uncategorized/2003/09/2886-2/ "Eight weeks later, the first public demonstration wa

http://arstechnica.com/uncategorized/2003/09/2886-2/ http://arstechnica.com/uncategorized/2003/09/2886-2/ "Eight weeks later, the first public demonstration was given to the class by using a simple ping packet. With a blinding 2bps speed, the class sat patiently as the packet was received in roughly 140 seconds. " That's why. Sound is a pretty slow wavelength. Low end is 60hz, lets call it 600hz tones in this bongo (I don't actually know). However ultra sound is at 20 kHz and above. Eg 33 times faster. 33x the data. Eg 140 seconds now takes 4.25 seconds. Lets assume the bongo was 10 too long. Now we're down to 14 seconds in audible and .42 seconds in ultrasound. you can see the benefit. and that's without actually doing a real data rate calculation becuase I don't have a good number on how many waveforms you have to have on sound to pick up a real signal. Somthing somthing nyquest criterion somthing somthing.