The incredibly wise Richard Lee wrote:
The 2nd type of source/object are artificial. HOA is most useful for
shoot-them-up games and other virtual reality stuff. You pan the
(mono) bad guy to someplace in your HOA space
BUT THIS STUFF CAN USUALLY BE SET AT AN INFINITE DISTANCE SO NO NFC IS
REQUIRED
This morning, I watched & listened to a Facebook video where the
designer recorded a large jazz orchestra in a very large concert hall
(floor seats and two levels of balconies) with a whole bunch of spot
mics. He then assembled a third-order ambisonic recording. In a way,
these spot mics are artificial sources. They're mono and panned to
someplace in HOA space.
(I'd love to post a link to the video, but the author removed it.)
There was a large ~20-piece jazz orchestra on the stage in three rows.
Two soloists stood at the front of the stage. And a choir sang from the
second balcony at the left of the stage. As you panned around, it
sounded great, except...
... the rear row of musicians on the stage (bass guitar, drummer,
trumpets) all sounded like they were in the front row. The choir in the
balcony sounded like they were standing behind one of the soloists.
This sounded even more un-natural as you panned around.
There was no distance compensation at all. And it sounded very, very
strange. I kept looking for instruments only to find that they weren't
where I expected them - they were way out there, instead of where I was
hearing them (which was very close by).
I suspect that a big part of the problem was due to the lack of ambience
in the spot mics. The ambience is a really important cue for distant
sources.
Len Moskowitz (moskow...@core-sound.com)
Core Sound LLC
www.core-sound.com
Home of OctoMic and TetraMic
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