Hi Jörn and Bearcat
On 16/07/2011 06:56, Jörn Nettingsmeier wrote:
On 07/16/2011 01:32 AM, "Bearcat M. Şandor" wrote:
I found that review/interview of the 2 channel surround sound i was
referring to earlier:
http://www.hometheater.com/content/tech-spotlight-srs-future-surround
The first copy i saw didn't have the 2nd page. In it it's explained that
you'd need speakers behind you to hear things behind you.
Hmm, reading through this, it seems that basically they've discovered MPEG4 Spatial Audio Object
Coding :-)
They speak of proximity, of things moving closer and further away from
your face. Can ambisonics do that as well?
classical ambisonics doesn't really do that. on good recordings, you will get a very nice sense of
distance, but that is due to distance cues which are more or less independent of ambisonics (any
good recording method can do it).
what you definitely won't get (with any order less than "ridiculously high") are sources closer
than the ring of speakers.
Whilst I agree that you can't generally get stationary audio objects closer than the radius of the
speakers on low order systems (currently, only high order Ambisonic systems, WFS or crosstalk
cancelled binaural systems can do that - oh, and the various ultrasound based speakers), you can get
reasonably quickly moving objects to appear to pass close by, especially if the acoustic of the
playback space is dead relative to the reproduced space, provided you give enough cues (particularly
early reflection patterns and proximity effect) in the soundscape to override the conflicting
playback space cues. Whilst this also occurs with any decent replay methodology, it is easier with
Ambisonics because (I suspect) of the fact that there is always more than one speaker producing
sound, so the local space cues conflict not just with the soundscape cues, but also each other,
weakening the perceptual effects of the local cues.
Dave
--
These are my own views and may or may not be shared by my employer
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