[aprssig] New APRS virtual reality Idea!

Scott Miller 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
> inbetween...
> 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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