On Aug 22 2019, Ralf Mardorf has written:
...
On the quick my guess is
Original left channel + inverted right channel = plain_left
Original right channel + inverted left channel = plain_right
Original left channel + inverted plain_left = middle only
Original right channel + inverted plain_right = middle only
...
That sounds good. Unforunately it didn't work.
I went down that road once before.
"Plain" channels:
a = l - r ("side" in mid/side)
b = r - l
Then l - a = l - (l - r) = r and r - b = r - (r - l) = l, neither of which
isolates the center.
The idea of the karaoke effect is to cut in-phase material that is in
common between the channels (e.g. often lead vocals). You'd think you can
do the karaoke effect and then some subtraction would leave you with
"whatever is not the karaoke effect," but in fact, variables cancel out in
a way that you don't get anything useful. This might be the reason why you
don't find a lot of plugins for this.
hjh
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