Adam Somers wrote:
At least you would have to shift the speaker positions and find or
find/interpolate the HRIR positions, right? (We are speaking of a
head-tracked decoder.)
No, instead we rotate the soundfield *before* decoding.
Sorry, this is of course the normal way. (I tried to map loudspeakers to
HRIR positions, an idea which came from some other and totally unrelated
discussion. This is obviously not necessary here, my apologies! *)
FOA seems to have some problems with height. One reason could be that
height localizations seems to happen at quite high frequencies. Just some
hint which would have to be treated in depth...
However, my interpretation of your words is that JauntVR maybe doesn't
employ a 3D audio decoder. This is claimed in the articles about the
company. Are they doing 3D audio decoding or not, then?
(The question is even more justified if I hint to the fact that you need
more than 4 speakers if realizing any 3D decoder for FOA... So?!)
We are doing 3D audio decoding with respect to listener motion, i.e., we do
tilt & tumble rotation in addition to horizontal. So even with a
horiz-only downmix the decoded content is informed by listener orientation
in 3D. We have tried David's binaural + height decoder and agree that it's
not convincing enough in its current form. We are exploring HOA upmixing
and other spatial formats, but can't provide any details yet.
Why not using Harpex? Svein Berge is on this list...
Of course,
we have constructed a spherical listening room which does full XYZ
decoding, but our primary interest is in binaural.
Finally, thanks for the technical response. Because this is a technical
forum, and we can't work with PR information - which might be misleading,
as we have seen. (Speaking about the 3D audio part. I would be happy to
hear the answer if the JauntVR people are doing horiz.-only or 3D decoding.
Without this information we don't know what we are talking about!)
Now you know :)
But at least I could issue some hint that the upmixing issue for FOA has
been treated and solved already elsewhere:
http://harpex.net/about.html
(1) and (2).
Cheers,
Adam
Cheers,
Stefan
* Errare humanum est. :-D
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