[aprssig] New APRS virtual reality Idea!

Scott Miller scott at opentrac.org
Thu Sep 20 14:48:47 CDT 2007

As long as you're putting equipment on your head, just add a pager type 
vibrator motor and link the speed to the distance.

I just saw a video the other day where they were using those with IR 
distance sensors on a headband for 'haptic radar' for obstacle avoidance.

If you really wanted to get creative, you could put a ring of them 
around your body to indicate the speed and direction of travel of the 
other person.


Wes Johnston, AI4PX wrote:
> No need to have a high/low tone to indicate distance.... I just listen 
> to the amount on noise on his signal.  hihi.
> Wes
> On 9/20/07, *Robert Bruninga* <bruninga at usna.edu 
> <mailto:bruninga at usna.edu>> 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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> -- 
> In theory there is no difference between practice and theory.
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