Hi,
Date: Fri, 21 Jun 2013 19:01:27 +0000
From: Fons Adriaensen <f...@linuxaudio.org>
On Fri, Jun 21, 2013 at 10:14:35AM -0700, Eric Carmichel wrote:
Perhaps readers here have had success with a simple stereo to L-C-R
converter? I have converted Ambisonic recordings to L-C-R: This is
pretty easy with any number of plug-ins (I use Harpex for most of my
Ambisonic processing).
If the stereo signal was recorded using more or less coincident
mics then a process similar to Harpex should probably work.
One thing you could try: pan you L,R signals into first order
AMB (W,X,Y), e.g. at plus and minus 45 degrees, then let
Harpex do the work...
W = L + R
X = L + R
Y = L - R
Never tried it, but it could work.
I have tried it, and it works pretty well. My interpretation was that
X sort of gives you a cardioid pointing front, and Y a figure-8 side
to side. I scaled W, X and Y by 0.5 to match the MS equations, then W
by 0.7 to arrive at FuMa.
Obviously other scalings are possible. You can also derive a Z signal
as a scaled version of W to move the image up and down. Hardly
theoretically perfect, but it can be effective.
Other stereo decoding equations have been discussed previously, and
these are variations on this basic idea e.g.
W = M - 1.1308wjS
X = M + 0.8843wjS
Y = 2.1332wS + p(jM + 1.308wS)
j = sqrt -1.
M = L + R
S = L - R
w = Width 0. < 1.
p = 0.25
Another thing that works nicely is a UHJ to B-Format decoder, also
previously discussed. Can't lay my hands on the equations at the moment.
Ciao,
Dave Hunt
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