Does anyone here have a reference for an explanation of the concept behind
joint stereo?
Because of the way LP4 narrows the separation of stereophonic material, I
had the impression that joint stereo encoded an (L+R)/2 channel and an
(L-R)/2 channel, allotting more bandwidth to the former.
But something I read elsewhere said something about using the full bandwidth
when the channels match and splitting it when they differ. That would imply
that, for perfectly balanced monophonic input, LP2 would record two channels
of it at 66kbps each, while LP4 would record a single 66kbps channel with
double the capacity instead of the redundant copy. So one might record
monophonic input at SP mono to get better quality or to have it playable on
non-MDLP hardware, but recording it at LP2 would be no better (just more
wasteful) than recording it at LP4.
Off-center mono is another story.
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