On 2017-01-09, Stefan Schreiber wrote:
The critique I'd have for such panning laws is that they don't really
respect the ambisonic/Gerzon theory, especially at the low
frequencies.
Stereophonic panning laws are based on Blumlein's stereo theory, which
in Wittek's opinion is pretty close to sound fields anyway.
Correct, but only in the high order, dense limit. In the low order,
sparse array case, which especially four speaker POA deals with, you can
do better. That's why POA decoders don't go in-phase but max energy even
at HF, and especially why we have shelf filters which cut the decode
down to velocity coherence at the low end.
Obviously all of those decoding principles converge to holophony in the
high order, dense array limit, so that Wittek is correct in that case.
However I'd argue that the whole point of POA is to optimally deal with
the low order, sparse array case, where each of the decoding principles
are pretty far from convergence, and in very different ways -- intensity
panning pretty much corresponding to an in-phase decode, which we
already know is *not* always optimal.
--
Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front
+358-40-3255353, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2
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