On Fri, 2006-12-15 at 16:08 +0000, Ole Tange wrote: > Apparently the Neo may be capable of transmitting ultrasound (20 KHz - > around 45 KHz). If the Neo is also capable of receiving this (using > the microphone) then we should be able to transmit data that way. This > may be useful for close range network (e.g. transmit business card). > > The protocol will be similar to wireless ethernet. The range will be > similar to Bluetooth.
It's definitely a neat idea :-) My concern though, is that the exact frequency coming out of the Neo is determined by the physical properties of the individual handset - e.g. if the speakers are positioned slightly differently as an artifact of the manufacturing process.. this could affect the range/pitch which is measurable externally. It's possible that a Neo could calibrate itself by simultaneously sampling the pitch it is outputting.. but then you have to factor in other unknowns like internal resonance, or whether the microphone will register the pitch at different levels depending on the source orientation. I don't know enough about audio engineering to say whether these are relevant factors or not.. but until we are able to start testing these things out with production models or an audiologist chimes in.. I'm more cautious than excited about this possibility. Even if we did have bluetooth, I still think there would be room for this idea if it works. Richard _______________________________________________ OpenMoko community mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/community
