Exactly, agreed.
So there finally < are > some issues if you are (just) inserting a
1st order signal into a 2nd order one...
Upmixing actually seems to avoid these problems, so maybe this should
be a routine step IF you do order conversion? (The advantages are not
only that sources are becoming sharper. COMPASS seems also to perform
decorrelation of ambient parts, and that there could be some energy
loss if performing “zero-stuffing” of HOA elements seems to be very
probable.)
“so you are actually better off letting spatial
aliasing kick in and just use a first order decoder, albeit with the
wrong information in those higher orders.”
I don’t quite understand this, because you don’t feed higher order
elemts into an FOA decoder...
Maybe you refer to aliasing effects of FOA rendering on speaker
systems with (too) many speakers?
Best,
Stefan
Hi Stefan,
Perhaps some confusion with my email, where with a chunk of it (and
all the text you reffered too) I was quoting Hannes message, but
this didn’t format correctly.
So as per the rest of my message I am in full agreement with you
that with (mode matching) decoders, you will get a different
solution using either first order material with first order decoder,
or first order material with zeros and with second order decoder.
The difference is that you are forcing the reproduced soundfield to
have zero energy in those higher order contributions. As per Solvang
and Bernschutz's work this can create a loss of energy and
percievable issues, so you are actually better off letting spatial
aliasing kick in and just use a first order decoder, albeit with the
wrong information in those higher orders. You have the same issue
with loudspeaker rendering, virtual loudspeaker rendering and direct
SH domain rendering as the underlying mathematics is the same.
Thanks
Jacob
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