It is called "Tri-Field" but it probably is just a similar name ..
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Tri-Field Processing: A unique combination of Dolby Digital and Digital Sound Field Processing.
from here

Also
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Yamaha's 'enhanced' versions of Dolby and dts decoding add DSP-derived effects to the rear and auxiliary front channels, creating 'soundfields' at the front and rear left/right (Trifield Cinema DSP) or front, rear left/right and centre (Quadfield Cinema DSP)
from here


Costas


[This message has been edited by kacos (edited 05-31-2005).]

smile