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[aprssig] New APRS virtual reality Idea!

Scott Miller scott at opentrac.org
Thu Sep 20 19:34:55 UTC 2007

Oh yeah, and the compass has to be on your head.

Given hams' propensity for absurd head wear that might not be a big 
deal.  It doesn't have quite the same potential for loss of dignity as 
my idea for a helmet-mounted anemometer for paraglider pilots.

Who knew a propeller beanie could actually be functional?


Scott Miller wrote:
> 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.
> Scott
> N1VG
> 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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