Jörn Nettingsmeier wrote:
On 03/26/2016 05:58 AM, Albert Leusink wrote:
Hello,
Is it possible to have a non-rotating stereo source in the ambisonic
soundfield, while all the other sources rotate?
Let's say I have a stereo music bed in a spherical video that needs
to stay
in position, while the other elements (dialog, sfx etc.) respond to
rotation.
are you talking about a head-tracked VR movie?
i don't see why you would want to do that. the effect will be quite
strange... why would any part of the sound mix stay constant wrt head
position?
the effect would be a bit like rotating the music bed in the cinema
every time the camera pans - funny, but certainly irritating.
if you absolutely have to do it, the only way is to deliver two
streams, one head-tracked and counter-rotated, the other not. which
means you'd have to have control over the listener's player software.
Exactly. So you could rotate a (1st) SF stream, and either pan a (2nd)
stereo object/stream into the SF (at current viewing direction, if I
understood well), or you could do a direct stereo --> binaural
transformation for the stereo stream. In any case there would be always
two different (i.e. independent) streams, just as Jörn says. You can
combine these in different ways.
the only way to get two rotationally invariant signals into the stream
is a cardioid pointing up and another one pointing down. if your
player ignores head tilt, the result is like summing to mono and
mixing into W. if it supports head tilt, the result is likely even
worse :-D
But this is an interesting case, nevertheless. :-)
Best,
Stefan
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