[Vorbis-dev] Vorbis Ambisonic coupling

[Richard Lee]

>- The Ambisonic B-format WXYZ channels should be should be lossless coupled together over most of the frequency range.  This will give the most gain as W "usually*" has everything that XYZ has.  A perfect B-format signal has scaled versions of XYZ in W.*

>- We allow "4 phase coupling" at higher frequencies.  A perfect B-format set of WXYZ should only have real relation to each other*.  The deviations from perfection can take 2 forms.

I have a few questions.

Is there a document which details the frequency banding strategy used by Vorbis?

Is it more usual to adopt eg "8 phase" at a lower frequency band before going to "4 phase"?

Do the terms "8 phase", "4 phase", "point" still make sense when we are coupling 4 channels?



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