I realize that the discussion is about perfection. But in
practice my experience with an Oscar(Sennheiser dummy head)
played back through head phones was that things like up and behind
off to one side a bit, all around in short, worked really well,
on headphones and with the generic pinnae of the dummy.
Of course, the clicker signal that they were using is one
of the more easily localized things. (Good for dog training too).
Still, in musical terms, where absolutely precisely correct location is
not really important(you are not trying to shoot down the brass band
up and in the rear), it seems to me that this will really work
quite well. I know that in theory there are problems. But in practice
the clicks were heard where they should have been heard.
The way the demo worked was that they would click while on had one's eyes
shut. Then one pointed at the direction that the click seemed to come
from. Then one opened one's eyes and looked at where the clicker actually
was relative to Oscar. It was uncanny how well it worked. OK so this is
not hard science with measurement of localization down to a few degrees.
But in general terms, it was a goodie.
Robert
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