At 19:55 1/6/2013, Sampo Syreeni wrote:
On 2013-06-01, David Pickett wrote:
What I take this to mean is that if one is using WXY (derived from
A-format) for horizontal only playback, W will contain unwanted
vertical information that should be discarded.
Correct for W, but also for X and Y. That's not the end of the story
either: you can't nicely and linearly subtract even the cleanest,
purely up-down information from the signal set. If you try to do
that by subtracting Z from W, it works for signals which come from
above. But now signals coming from below are suddenly doubled. All
you ended up doing is to put in a cardioid weighting on the signal
set, and you can't have the cardioid pointing more than one way at
the same time. That holds for the notional cardioid pointing in
other directions as well, which shows you X and Y too are affected.
So, to record horizontal-only ambisonics, does it follow that a
native-B approach of four cardioids or fig8/fig8/omni will give
inhrently better results than a tetrahedral array?
David
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