[aprssig] New APRS virtual reality Idea!
scott at opentrac.org
Thu Sep 20 14:28:41 CDT 2007
I discussed this idea with a friend the other day, in the context of the
Army's Land Warrior system. The biggest problem I see is in reliably
determining the direction you're facing. A fast, accurate electronic
compass that can tolerate a lot of tilt in two axes is NOT cheap. Last
time I checked Honeywell had those for about $400.
Other than that, I think the sound stuff could be done with
off-the-shelf hardware. It's already done in video games.
Robert Bruninga wrote:
> This is a NEAT idea if anyone wants a fun project.
> That also knows how to write some DSP software:
> Imagine an APRS product that works like this:
> Imagine wearing a pair of headphones.
> Close your eyes and face north.
> When an APRS user with a D7 HT speaks,
> You HEAR him in the direction where he is.
> If he is to the East, you hear him to the right.
> If he is to the west, you hear him to your left.
> Anywhere in between, and the earphones are phased so that you
> hear his direction.
> Now, too bad the APRS PTT mode does not put the position data at
> the FRONT of a packet, but at the end. At the front, you could
> know who is talking from where and you could then phase delay
> his voice to create the correct virtual postion. But it isnt.
> The packet is at the end.
> So, given this end-PTT limitation, then here is how I would
> implement this and it also makes it simpler.
> 1) Pass the voice through both earphones in MONO.
> 2) When the PTT mode packet comes in
> 3) Send a "roger-beep" to the earphones.
> (A) Phased to indicate direction
> (B) Tone frequency to indicate distance.
> High tone means close. Low tone means far. Any other tone
> Once that is working, make it proportional to own-heading, and
> now you can "see APRS in the dark"...
> Bob, WB4APR
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