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[aprssig] Re: New APRS Virtual Reality Idea(s)!

Steve Noskowicz noskosteve at yahoo.com
Fri Sep 21 15:10:17 UTC 2007


   I have been helping a blind ham with various things
over the past few years and I find that some things
that seem like a good idea are, but then, others
aren't.  When the blind person explains, then you see
why, but it isn't necessarily obvious at first.  Then,
some of my ideas are ones he never thought of or heard
of and are better.
    Also, I'm not convinced it is the head movement
that we use to resolve it.  I still think we *can*
tell behind vs. in front without head movement.  I
strongly suspect it is local reverb, meaning that in
an open field (no reverb) we can't tell.
  Obviously, moving the head will comfirm, but I still
suspect the other too.  I can also believe some
frequency response difference from front to rear.  The
answer is probably on the web somewhere...
   If it *is* another person behind you, they also
change the local reverb, adding another cue.
   I worked at Shure Bros. for a while.   Stepping
into a room sized anechoic chamber [ or just sticking
your head into a smaller one] is a strange experience.
 You realize how much local reverb there is all the
time, that goes unnoticed.
  The ear-brain system is indeed, an amazing one.

73, Steve, K9DCI


--- Bob Bruninga  <bruninga at usna.edu> wrote:

> > The issue is that 45 degrees (in front of right) 
> > will be the same as 135 degrees (behind right);
> > not a "dead ahead/behind" problem. 
> 
> Good point.  I'm betting that this can be resolved
> by the same method we move our heads to resolve it
> with our ears.  [...snip...]
> 
> And even if it was artificial to the way the real
> brain ear works, I bet the brain would adapt very
> quickly and learn the techinque to resolve the
> fore/aft ambiguity. ...


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