HI All
The previous posters already said it all.
I can only add that it is almost impossible to find out from an acoustic
Soundfield or other microphone setup recording, whether it is UHJ or not.
I don't know about higher developed ways of finding this out, but from a
sound engineer's point of wiew here's my 5 cents worth:
It is sometimes possible to see from a goniometer if a multitrack
recording from mono microphones has been encoded into UHJ. Or actually -
you can see the difference between a "normal" panned stereo and UHJ,
as the directions of individual panned sources can be detected from
"normal" stereo. They look like sharp(ish) direct lines, but UHJ doesn't
have such components anywhere else than on the edges of the two speaker
stereo, ie. at -45 and +45 degrees. In all directions there are phase
differences
between the two channels.
The easiest direction is possibly at "North", 0 degrees, as a mono sound in
center front appears with a phase difference in UHJ. Unless there is an
effect or reverb in the vocalist's voice, which again produces phase
differences.
- - -
There is one recording, in which I tried to find out which is binaural
and which UHJ:
World Record, WWCD002, that is listed in the Discography.
Some of the tracks are Holophonics and some are UHJ. The CD cover doesn't
say which is which. I really couldn't tell the difference by looking at
the goniometer.
The only way I could guess was listening. The Holophonic tracks appear to
localize outside the head, UHJ of course doesn't.
Eero
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