I don't have a Pro Logic system right now, and i want to check the results of some tests that i've been doing for 4:2 .
Does anyone know of some app to extract LCRS information ?
Thanks in advance.
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From what ? Prologic was an analogue method, so there aren't discrete channels in the same sense as AC3. If you have just a stereo source - say a VHS tape - it will be difficult to extract the prologic information. If you have an AC3 file with prologic flags then is definately possible.
What i want, is to get a "PRO Logic information" in WAV format, from some mixings that i've been doing.
I have the material in WAV and AC3 2.0 also.
Is this possible ?
The "Pro Logic" information is just stereo. There is nothing special in the audio, except it may have been tweaked to make the out of phase signals a little more pronounced, for better rear effects.
If I remember corrrectly, the original pro logic was pretty much just a Hafler setup + centre speaker connection, with a half-strength DolbyB noise reduction circuit stuck in so Dolby could claim license fees.
If you don't have a pro logic system, you might like to try wiring 4 speakers up in a "Hafler" configuration from a normal stereo output to get an idea of what's happening.
If you have the stereo track, have a read of this article
At the bottom are the matrices used, so you can build the channels yourself with phase shifting.
This might also interest you
You can play the sound prologic sound with our DirectShow filter which has a built in DPLII decoder
and it will generate 6 channel stream...which is sent directly to the rendering device.
But I do not know if you
can capture it to 6 channel wave...
But at least you can perform some listenings.