Dolby

Dolby, analog and digital sound up to 6.1, not encoded as true 6.1,
but a mix from 5.1, surround center back is matrixed into the
surround left and right channels called Dolby Digital 5.1 EX
(the earlier called AC-3, is Dolby Digital up to 5.1). Others from
Dolby are (analog formats) Dolby pro Logic (4.0), Dolby pro Logic
II (5.1), Dolby pro Logic IIx (7.1), mix from stereo etc.


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